| **Postretirement Benefits - Narrative (Details) employees in Thousands, $ in Millions**                                                                | 3 Months Ended | 12 Months Ended |
|--------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|-----------------|
||
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Defined Benefit Plan, Net Periodic Benefit Cost                                                                                                        |           |            |   |   |   |   | $ 153 | $ 150 | $ 160 |
| Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Projected Benefit Obligation              | $ 3,946        |            |   | $ 3,631 |   |   | 3,946 | 3,631 |   |
| Defined Benefit Plan, Accumulated Benefit Obligation                                                                                                   | 4,000          |            |   |   |   |   | 4,000 |   |   |
| Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year                                                                  |           |            |   |   |   |   | 110 |   |   |
| Restructuring Charges                                                                                                                                  |           |            |   |   |   |   | 10 | 76 | 42 |
| Defined Contribution Plan, Cost Recognized                                                                                                             |           |            |   |   |   |   | 29 | 29 | 27 |
| Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Accumulated Benefit Obligation            | 3,934          |            |   | 3,612 |   |   | 3,934 | 3,612 |   |
| Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Fair Value of Plan Assets                 | 2,224          |            |   | 2,061 |   |   | 2,224 | 2,061 |   |
| Defined Benefit Plan, Benefits Paid                                                                                                                    |           |            |   |   |   |   | $ 15 |   |   |
| Number Of Former Employees And Their Beneficiaries Included In Retiree Population | employees                                                          |           |            |   |   |   |   | 33 |   |   |
| Defined benefit plan, weighted average rate of increase in in per capita cost percent of benefit obligation                                            |           |            |   |   |   |   | 8.20% |   |   |
| Other Pension Plan [Member]                                                                                                                            |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Defined Benefit Plan, Benefits Paid                                                                                                                    |           |            |   |   |   |   |   | 15 |   |
| United States Postretirement Benefit Plan of US Entity [Member]                                                                                        |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Deferred Income Taxes and Other Assets, Noncurrent                                                                                                     | 548            |            |   |   |   |   | $ 548 |   |   |
| Pension Benefits                                                                                                                                       |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months                                                                             | 306            |            |   |   |   |   | 306 |   |   |
| Fair Value of Plan Assets                                                                                                                              | $ 2,310        |            |   | $ 2,422 | $ 2,627 |   | $ 2,310 | $ 2,422 | $ 2,627 |
| Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets                                      |           |            |   |   |   |   | 7.50% | 7.80% | 7.80% |
| Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate                                                                   | 3.50%          |            |   | 4.00% |   |   | 3.50% | 4.00% |   |
| Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate                                                            |           |            |   |   |   |   | 4.50% | 3.70% | 4.10% |
| Defined Benefit Plan, Assumptions Used in Calculating Interest Cost, Discount Rate                                                                     |           |            |   |   |   |   | 3.10% | 3.70% | 4.10% |
| Defined Benefit Plan, Future Amortization of Prior Service Cost (Credit)                                                                               |           |            |   |   |   |   | $ 0 |   |   |
| Defined Benefit Plan, Net Periodic Benefit Cost                                                                                                        |           |            |   |   |   |   | 82 | $ 69 | $ 106 |
| Employer contributions                                                                                                                                 |           |            |   |   |   |   | 100 | 113 |   |
| Effect of change in estimate approach on interest cost                                                                                                 |           |            |   |   |   |   | 36 |   |   |
| Defined Benefit Plan, Benefits Paid                                                                                                                    |           |            |   |   |   |   | 300 | $ 309 |   |
| Defined Benefit Plan, Future Amortization of Gain (Loss)                                                                                               |           |            |   |   |   |   | $ 117 |   |   |
| Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase                                                   | 3.50%          |            |   | 3.50% |   |   | 3.50% | 3.50% |   |
| Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase                                            |           |            |   |   |   |   | 3.50% | 3.50% | 3.50% |
| Defined Benefit Plan, Fair Value of Plan Assets Excluding Receivables                                                                                  | $ 2,297        |            |   | $ 2,404 |   |   | $ 2,297 | $ 2,404 |   |
| Defined Benefit Plan, Expected Future Benefit Payments, Year Two                                                                                       | 293            |            |   |   |   |   | 293 |   |   |
| Defined Benefit Plan, Expected Future Benefit Payments, Year Three                                                                                     | 287            |            |   |   |   |   | 287 |   |   |
| Defined Benefit Plan, Expected Future Benefit Payments, Year Four                                                                                      | 281            |            |   |   |   |   | 281 |   |   |
| Defined Benefit Plan, Expected Future Benefit Payments, Year Five                                                                                      | 273            |            |   |   |   |   | 273 |   |   |
| Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter                                                                   | 1,252          |            |   |   |   |   | 1,252 |   |   |
| Other Postretirement Benefit Plan [Member]                                                                                                             |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months                                                                             | 100            |            |   |   |   |   | 100 |   |   |
| Fair Value of Plan Assets                                                                                                                              | $ 333          |            |   | $ 369 | 415 |   | 333 | $ 369 | $ 415 |
| Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components                                                  |           |            |   |   |   |   | $ 12 |   |   |
| Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets                                      |           |            |   |   |   |   | 7.50% | 7.80% | 7.80% |
| Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate                                                                   | 3.50%          |            |   | 4.10% |   |   | 3.50% | 4.10% |   |
| Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate                                                            |           |            |   |   |   |   | 4.60% | 3.70% | 4.10% |
| Defined Benefit Plan, Assumptions Used in Calculating Interest Cost, Discount Rate                                                                     |           |            |   |   |   |   | 3.30% | 3.70% | 4.10% |
| Defined Benefit Plan, Future Amortization of Prior Service Cost (Credit)                                                                               |           |            |   |   |   |   | $ 0 |   |   |
| Defined Benefit Plan, Net Periodic Benefit Cost                                                                                                        |           |            |   |   |   |   | 71 | $ 81 | $ 54 |
| Employer contributions                                                                                                                                 |           |            |   |   |   |   | 2 | 2 |   |
| Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year                                                                     |           |            |   |   |   |   | 2 |   |   |
| Effect of change in estimate approach on interest cost                                                                                                 |           |            |   |   |   |   | 17 |   |   |
| Defined Benefit Plan, Benefits Paid                                                                                                                    |           |            |   |   |   |   | 179 | 183 |   |
| Defined benefit plan, benefits paid from Company assets                                                                                                |           |            |   |   |   |   | 66 | $ 61 |   |
| Defined Benefit Plan, Future Amortization of Gain (Loss)                                                                                               |           |            |   |   |   |   | $ 23 |   |   |
| Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase                                                   | 0.00%          |            |   | 0.00% |   |   | 0.00% | 0.00% |   |
| Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase                                            |           |            |   |   |   |   | 0.00% | 0.00% | 0.00% |
| Defined benefit plan, weighted average rate of increase in in per capita cost percent of benefit obligation                                            |           |            |   |   |   |   | 88.00% |   |   |
| Defined Benefit Plan, Ultimate Health Care Cost Trend Rate                                                                                             |           |            |   |   |   |   | 5.00% |   |   |
| Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year                                                                         |           |            |   |   |   |   | 9.00% |   |   |
| Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components                                                  |           |            |   |   |   |   | $ (10) |   |   |
| Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation                                         |           |            |   |   |   |   | 205 |   |   |
| Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation                                         |           |            |   |   |   |   | (159) |   |   |
| Defined Benefit Plan, Fair Value of Plan Assets Excluding Receivables                                                                                  | $ 333          |            |   | $ 368 |   |   | 333 | $ 368 |   |
| Defined Benefit Plan, Expected Future Benefit Payments, Year Two                                                                                       | 105            |            |   |   |   |   | 105 |   |   |
| Defined Benefit Plan, Expected Future Benefit Payments, Year Three                                                                                     | 111            |            |   |   |   |   | 111 |   |   |
| Defined Benefit Plan, Expected Future Benefit Payments, Year Four                                                                                      | 111            |            |   |   |   |   | 111 |   |   |
| Defined Benefit Plan, Expected Future Benefit Payments, Year Five                                                                                      | 112            |            |   |   |   |   | 112 |   |   |
| Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter                                                                   | 532            |            |   |   |   |   | 532 |   |   |
| Chatham [Member] | Facility Closing [Member] | Other Postretirement Benefit Plan [Member]                                                              |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Postemployment Benefits, Period Expense                                                                                                                |           | $ 5             | $ 2 |   |   | $ 14 |   |   |   |
| Fair Value, Inputs, Level 1 [Member] | Pension Benefits                                                                                                |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Defined Benefit Plan, Fair Value of Plan Assets Excluding Receivables                                                                                  | 917            |            |   | 946 |   |   | 917 | 946 |   |
| Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefit Plan [Member]                                                                      |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Defined Benefit Plan, Fair Value of Plan Assets Excluding Receivables                                                                                  | 156            |            |   | 163 |   |   | 156 | 163 |   |
| Fair Value, Inputs, Level 2 [Member] | Pension Benefits                                                                                                |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Defined Benefit Plan, Fair Value of Plan Assets Excluding Receivables                                                                                  | 1,078          |            |   | 1,269 |   |   | 1,078 | 1,269 |   |
| Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefit Plan [Member]                                                                      |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Defined Benefit Plan, Fair Value of Plan Assets Excluding Receivables                                                                                  | 121            |            |   | 163 |   |   | 121 | 163 |   |
| Fair Value, Inputs, Level 3 [Member] | Pension Benefits                                                                                                |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 301            |            |   | 188 |   |   | 301 | 188 |   |
| Defined Benefit Plan, Fair Value of Plan Assets Excluding Receivables                                                                                  | 1              |            |   | 1 |   |   | 1 | 1 |   |
| Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefit Plan [Member]                                                                      |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 56             |            |   | 42 |   |   | 56 | 42 |   |
| Defined Benefit Plan, Fair Value of Plan Assets Excluding Receivables                                                                                  | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Cash and Cash Equivalents [Member] | Pension Benefits                                                                                                  |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 76             |            |   | 126 |   |   | 76 | 126 |   |
| Cash and Cash Equivalents [Member] | Other Postretirement Benefit Plan [Member]                                                                        |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 19             |            |   | 29 |   |   | 19 | 29 |   |
| Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits                                                           |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 76             |            |   | 126 |   |   | 76 | 126 |   |
| Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefit Plan [Member]                                 |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 19             |            |   | 29 |   |   | 19 | 29 |   |
| Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits                                                           |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefit Plan [Member]                                 |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits                                                           |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefit Plan [Member]                                 |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 0              |            |   | 0 |   |   | 0 | 0 |   |
| US Large Cap [Member] | Pension Benefits                                                                                                               |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 209 |   |   | 0 | 209 |   |
| US Large Cap [Member] | Other Postretirement Benefit Plan [Member]                                                                                     |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 25 |   |   | 0 | 25 |   |
| US Large Cap [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits                                                                        |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 209 |   |   | 0 | 209 |   |
| US Large Cap [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefit Plan [Member]                                              |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 25 |   |   | 0 | 25 |   |
| US Large Cap [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits                                                                        |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| US Large Cap [Member] | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefit Plan [Member]                                              |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| US Large Cap [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits                                                                        |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 0              |            |   | 0 |   |   | 0 | 0 |   |
| US Large Cap [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefit Plan [Member]                                              |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 0              |            |   | 0 |   |   | 0 | 0 |   |
| US Smid Cap [Member] | Pension Benefits                                                                                                                |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 253 |   |   | 0 | 253 |   |
| US Smid Cap [Member] | Other Postretirement Benefit Plan [Member]                                                                                      |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 42 |   |   | 0 | 42 |   |
| US Smid Cap [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits                                                                         |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 253 |   |   | 0 | 253 |   |
| US Smid Cap [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefit Plan [Member]                                               |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 42 |   |   | 0 | 42 |   |
| US Smid Cap [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits                                                                         |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| US Smid Cap [Member] | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefit Plan [Member]                                               |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| US Smid Cap [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits                                                                         |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 0              |            |   | 0 |   |   | 0 | 0 |   |
| US Smid Cap [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefit Plan [Member]                                               |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Canadian Equity [Member] | Pension Benefits                                                                                                            |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 30 |   |   | 0 | 30 |   |
| Canadian Equity [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits                                                                     |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 30 |   |   | 0 | 30 |   |
| Canadian Equity [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits                                                                     |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Canadian Equity [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits                                                                     |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 0              |            |   | 0 |   |   | 0 | 0 |   |
| International Equity [Member] | Pension Benefits                                                                                                       |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 216 |   |   | 0 | 216 |   |
| International Equity [Member] | Other Postretirement Benefit Plan [Member]                                                                             |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 53 |   |   | 0 | 53 |   |
| International Equity [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits                                                                |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 216 |   |   | 0 | 216 |   |
| International Equity [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefit Plan [Member]                                      |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 53 |   |   | 0 | 53 |   |
| International Equity [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits                                                                |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| International Equity [Member] | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefit Plan [Member]                                      |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| International Equity [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits                                                                |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 0              |            |   | 0 |   |   | 0 | 0 |   |
| International Equity [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefit Plan [Member]                                      |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Emerging Markets Equity [Member] | Pension Benefits                                                                                                    |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 77 |   |   | 0 | 77 |   |
| Emerging Markets Equity [Member] | Other Postretirement Benefit Plan [Member]                                                                          |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 14 |   |   | 0 | 14 |   |
| Emerging Markets Equity [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits                                                             |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 77 |   |   | 0 | 77 |   |
| Emerging Markets Equity [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefit Plan [Member]                                   |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 14 |   |   | 0 | 14 |   |
| Emerging Markets Equity [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits                                                             |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Emerging Markets Equity [Member] | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefit Plan [Member]                                   |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Emerging Markets Equity [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits                                                             |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Emerging Markets Equity [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefit Plan [Member]                                   |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Equity [Member] | Pension Benefits                                                                                                                     |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Equity [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits                                                                              |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Equity [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits                                                                              |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Equity [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits                                                                              |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Corporate Bond Securities [Member] | Pension Benefits                                                                                                  |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 792 |   |   | 0 | 792 |   |
| Corporate Bond Securities [Member] | Other Postretirement Benefit Plan [Member]                                                                        |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 80             |            |   | 100 |   |   | 80 | 100 |   |
| Corporate Bond Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits                                                           |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Corporate Bond Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefit Plan [Member]                                 |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Corporate Bond Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits                                                           |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 792 |   |   | 0 | 792 |   |
| Corporate Bond Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefit Plan [Member]                                 |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 80             |            |   | 100 |   |   | 80 | 100 |   |
| Corporate Bond Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits                                                           |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Corporate Bond Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefit Plan [Member]                                 |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Asset-backed Securities [Member] | Pension Benefits                                                                                                    |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 7 |   |   | 0 | 7 |   |
| Asset-backed Securities [Member] | Other Postretirement Benefit Plan [Member]                                                                          |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 3 |   |   | 0 | 3 |   |
| Asset-backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits                                                             |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Asset-backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefit Plan [Member]                                   |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits                                                             |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 7 |   |   | 0 | 7 |   |
| Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefit Plan [Member]                                   |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 3 |   |   | 0 | 3 |   |
| Asset-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits                                                             |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Asset-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefit Plan [Member]                                   |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Common And Preferred Stock [Member] | Pension Benefits                                                                                                 |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 449 |   |   | 0 | 449 |   |
| Common And Preferred Stock [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits                                                          |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Common And Preferred Stock [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits                                                          |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 449 |   |   | 0 | 449 |   |
| Common And Preferred Stock [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits                                                          |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 0              |            |   | 0 |   |   | 0 | 0 |   |
| U.S. Equity [Member] | Pension Benefits                                                                                                                |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 294            |            |   | 0 |   |   | 294 | 0 |   |
| U.S. Equity [Member] | Other Postretirement Benefit Plan [Member]                                                                                      |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 66             |            |   | 0 |   |   | 66 | 0 |   |
| U.S. Equity [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits                                                                         |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 294            |            |   | 0 |   |   | 294 | 0 |   |
| U.S. Equity [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefit Plan [Member]                                               |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 66             |            |   | 0 |   |   | 66 | 0 |   |
| U.S. Equity [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits                                                                         |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| U.S. Equity [Member] | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefit Plan [Member]                                               |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| U.S. Equity [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits                                                                         |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 0              |            |   | 0 |   |   | 0 | 0 |   |
| U.S. Equity [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefit Plan [Member]                                               |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Canadian Equity Other [Member] | Pension Benefits                                                                                                      |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 29             |            |   | 0 |   |   | 29 | 0 |   |
| Canadian Equity Other [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits                                                               |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 29             |            |   | 0 |   |   | 29 | 0 |   |
| Canadian Equity Other [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits                                                               |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Canadian Equity Other [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits                                                               |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 0              |            |   | 0 |   |   | 0 | 0 |   |
| International Equity Other [Member] | Pension Benefits                                                                                                 |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 291            |            |   | 0 |   |   | 291 | 0 |   |
| International Equity Other [Member] | Other Postretirement Benefit Plan [Member]                                                                       |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 71             |            |   | 0 |   |   | 71 | 0 |   |
| International Equity Other [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits                                                          |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 291            |            |   | 0 |   |   | 291 | 0 |   |
| International Equity Other [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefit Plan [Member]                                |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 71             |            |   | 0 |   |   | 71 | 0 |   |
| International Equity Other [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits                                                          |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| International Equity Other [Member] | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefit Plan [Member]                                |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| International Equity Other [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits                                                          |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 0              |            |   | 0 |   |   | 0 | 0 |   |
| International Equity Other [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefit Plan [Member]                                |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Fixed Income, Multi Asset Credit [Member] | Other Postretirement Benefit Plan [Member]                                                                 |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 41             |            |   | 0 |   |   | 41 | 0 |   |
| Fixed Income, Multi Asset Credit [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefit Plan [Member]                          |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Fixed Income, Multi Asset Credit [Member] | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefit Plan [Member]                          |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 41             |            |   | 0 |   |   | 41 | 0 |   |
| Fixed Income, Multi Asset Credit [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefit Plan [Member]                          |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Global Equity [Member] | Pension Benefits                                                                                                              |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 227            |            |   | 0 |   |   | 227 | 0 |   |
| Global Equity [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits                                                                       |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 227            |            |   | 0 |   |   | 227 | 0 |   |
| Global Equity [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits                                                                       |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Global Equity [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits                                                                       |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Fixed Income, Long Duration Credit [Member] | Pension Benefits                                                                                         |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 530            |            |   | 0 |   |   | 530 | 0 |   |
| Fixed Income, Long Duration Credit [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits                                                  |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Fixed Income, Long Duration Credit [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits                                                  |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 530            |            |   | 0 |   |   | 530 | 0 |   |
| Fixed Income, Long Duration Credit [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits                                                  |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Fixed Income, High Yield [Member] | Pension Benefits                                                                                                   |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 204            |            |   | 0 |   |   | 204 | 0 |   |
| Fixed Income, High Yield [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits                                                            |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Fixed Income, High Yield [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits                                                            |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 204            |            |   | 0 |   |   | 204 | 0 |   |
| Fixed Income, High Yield [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits                                                            |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Fixed Income, Canadian Bond [Member] | Pension Benefits                                                                                                |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 203            |            |   | 0 |   |   | 203 | 0 |   |
| Fixed Income, Canadian Bond [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits                                                         |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Fixed Income, Canadian Bond [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits                                                         |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 203            |            |   | 0 |   |   | 203 | 0 |   |
| Fixed Income, Canadian Bond [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits                                                         |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Global Real Estate [Member] | Pension Benefits                                                                                                         |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 141            |            |   | 0 |   |   | 141 | 0 |   |
| Global Real Estate [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits                                                                  |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Global Real Estate [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits                                                                  |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 141            |            |   | 0 |   |   | 141 | 0 |   |
| Global Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits                                                                  |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Global Infrastructure [Member] | Pension Benefits                                                                                                      |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 14             |            |   | 0 |   |   | 14 | 0 |   |
| Global Infrastructure [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits                                                               |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Global Infrastructure [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits                                                               |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Global Infrastructure [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits                                                               |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 14             |            |   | 0 |   |   | 14 | 0 |   |
| Commodities Investment [Member] | Pension Benefits                                                                                                     |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 21 |   |   | 0 | 21 |   |
| Commodities Investment [Member] | Other Postretirement Benefit Plan [Member]                                                                           |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 1 |   |   | 0 | 1 |   |
| Commodities Investment [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits                                                              |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Commodities Investment [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefit Plan [Member]                                    |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Commodities Investment [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits                                                              |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 21 |   |   | 0 | 21 |   |
| Commodities Investment [Member] | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefit Plan [Member]                                    |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 1 |   |   | 0 | 1 |   |
| Commodities Investment [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits                                                              |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Commodities Investment [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefit Plan [Member]                                    |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Hedge Funds [Member] | Pension Benefits                                                                                                                |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 230            |            |   | 109 |   |   | 230 | 109 |   |
| Hedge Funds [Member] | Other Postretirement Benefit Plan [Member]                                                                                      |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 42             |            |   | 22 |   |   | 42 | 22 |   |
| Hedge Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits                                                                         |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Hedge Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefit Plan [Member]                                               |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Hedge Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits                                                                         |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Hedge Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefit Plan [Member]                                               |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Hedge Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits                                                                         |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 230            |            |   | 109 |   |   | 230 | 109 |   |
| Hedge Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefit Plan [Member]                                               |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 42             |            |   | 22 |   |   | 42 | 22 |   |
| Private Equity Funds [Member] | Pension Benefits                                                                                                       |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 57             |            |   | 79 |   |   | 57 | 79 |   |
| Private Equity Funds [Member] | Other Postretirement Benefit Plan [Member]                                                                             |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 14             |            |   | 20 |   |   | 14 | 20 |   |
| Private Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits                                                                |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Private Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefit Plan [Member]                                      |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Private Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits                                                                |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Private Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefit Plan [Member]                                      |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Private Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits                                                                |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 57             |            |   | 79 |   |   | 57 | 79 |   |
| Private Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefit Plan [Member]                                      |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 14             |            |   | 20 |   |   | 14 | 20 |   |
| Exchange Traded Funds [Member] | Pension Benefits                                                                                                      |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 6 |   |   | 0 | 6 |   |
| Exchange Traded Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits                                                               |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 6 |   |   | 0 | 6 |   |
| Exchange Traded Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits                                                               |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Exchange Traded Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits                                                               |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Mutual Funds [Member] | Pension Benefits                                                                                                               |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 29 |   |   | 0 | 29 |   |
| Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits                                                                        |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 29 |   |   | 0 | 29 |   |
| Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits                                                                        |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Mutual Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits                                                                        |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Real Estate [Member] | Pension Benefits                                                                                                                |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 1              |            |   | 1 |   |   | 1 | 1 |   |
| Real Estate [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits                                                                         |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Real Estate [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits                                                                         |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits                                                                         |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 1              |            |   | 1 |   |   | 1 | 1 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Common Stock [Member] | Other Postretirement Benefit Plan [Member]                                                                                     |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 59 |   |   | 0 | 59 |   |
| Common Stock [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefit Plan [Member]                                              |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Common Stock [Member] | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefit Plan [Member]                                              |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 59 |   |   | 0 | 59 |   |
| Common Stock [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefit Plan [Member]                                              |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Fair Value of Plan Assets                                                                                                                              | 0              |            |   | 0 |   |   | 0 | 0 |   |
| Alternative Investments, Fair Value of Plan Assets, NAV                                                                                                | 0              |            |   | 0 |   |   | $ 0 | 0 |   |
| Return-seeking Assets [Member]                                                                                                                         |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Defined Benefit Plan, Target Allocation Percentage                                                                                                     |           |            |   |   |   |   | 70.00% |   |   |
| Liability-hedging Assets [Member]                                                                                                                      |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Defined Benefit Plan, Target Allocation Percentage                                                                                                     |           |            |   |   |   |   | 30.00% |   |   |
| North America Truck [Member] | Indianapolis and Waukesha Foundry [Member]                                                                              |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Restructuring Charges                                                                                                                                  |           |            |   |   | 13 |   | $ 2 | $ 28 |   |
| North America Truck [Member] | Indianapolis and Waukesha Foundry [Member] | Pension And Other Postretirement Contractual Termination Benefits [Member] |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Restructuring Charges                                                                                                                                  |           |            |   |   | $ 11 |   |   |   |   |
| Accounting Standards Update 2015-07 [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits                                                 |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Defined Benefit Plan, Transfers Between Measurement Levels                                                                                             | (301)          |            |   | (188) |   |   |   |   |   |
| Accounting Standards Update 2015-07 [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefit Plan [Member]                       |           |            |   |   |   |   |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                       |           |            |   |   |   |   |   |   |   |
| Defined Benefit Plan, Transfers Between Measurement Levels                                                                                             | $ (56)         |            |   | $ 42 |   |   |   |   |   |

| X                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Defined Benefit Plan, Alternative Investments, Fair Value of Plan Assets
+ References
No definition available.
+ Details**Name:**nav_DefinedBenefitPlanAlternativeInvestmentsFairValueofPlanAssets**Namespace Prefix:**nav_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                       |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Defined Benefit Plan, Assumptions Used in Calculating Interest Cost, Discount Rate
+ References
No definition available.
+ Details**Name:**nav_DefinedBenefitPlanAssumptionsUsedinCalculatingInterestCostDiscountRate**Namespace Prefix:**nav_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                           |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Defined benefit plan, benefits paid from Company assets
+ References
No definition available.
+ Details**Name:**nav_DefinedBenefitPlanBenefitsPaidFromCompanyAssets**Namespace Prefix:**nav_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                    |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Defined Benefit Plan, Fair Value of Plan Assets Excluding Receivables
+ References
No definition available.
+ Details**Name:**nav_DefinedBenefitPlanFairValueOfPlanAssetsExcludingReceivables**Namespace Prefix:**nav_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                               |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Defined Benefit Plan, Increase (Decrease) In Interest Cost
+ References
No definition available.
+ Details**Name:**nav_DefinedBenefitPlanIncreaseDecreaseInInterestCost**Namespace Prefix:**nav_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                    |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Defined benefit plan, weighted average rate of increase in in per capita cost percent of benefit obligation
+ References
No definition available.
+ Details**Name:**nav_DefinedBenefitPlanWeightedAverageRateOfIncreaseInInPerCapitaCostPercentOfBenefitObligation**Namespace Prefix:**nav_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                         |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number Of Former Employees And Their Beneficiaries Included In Retiree Population
+ References
No definition available.
+ Details**Name:**nav_NumberOfFormerEmployeesAndTheirBeneficiariesIncludedInRetireePopulation**Namespace Prefix:**nav_**Data Type:**xbrli:integerItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and other assets expected to be realized or consumed after one year or normal operating cycle, if longer.
+ References
No definition available.
+ Details**Name:**us-gaap_DeferredIncomeTaxesAndOtherAssetsNoncurrent**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920
+ Details**Name:**us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The interest rate used to adjust for the time value of money for the plan.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920
+ Details**Name:**us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate**Namespace Prefix:**us-gaap_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Expected rate of compensation increases (for pay-related plans).
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920
+ Details**Name:**us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease**Namespace Prefix:**us-gaap_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The interest rate used to adjust for the time value of money.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920
+ Details**Name:**us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate**Namespace Prefix:**us-gaap_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512046Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920
+ Details**Name:**us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets**Namespace Prefix:**us-gaap_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Expected rate of compensation increases (for pay-related plans).
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920
+ Details**Name:**us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease**Namespace Prefix:**us-gaap_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Benefits -URI http://asc.fasb.org/extlink&oid=49170737Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Postretirement Benefits -URI http://asc.fasb.org/extlink&oid=6521376Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920
+ Details**Name:**us-gaap_DefinedBenefitPlanBenefitsPaid**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of contributions made by the employer to defined benefit plans.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(ii) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 35 -Paragraph 123 -Subparagraph B -URI http://asc.fasb.org/extlink&oid=64937487&loc=d3e36068-114959Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 63 -Subparagraph B -URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12551-114930Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920
+ Details**Name:**us-gaap_DefinedBenefitPlanContributionsByEmployer**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
+ Details**Name:**us-gaap_DefinedBenefitPlanDisclosureLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920
+ Details**Name:**us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920
+ Details**Name:**us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The effect of a one-percentage-point increase in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920
+ Details**Name:**us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920
+ Details**Name:**us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of benefits from a defined benefit plan expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920
+ Details**Name:**us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of benefits from a defined benefit plan expected to be paid in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920
+ Details**Name:**us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of benefits from a defined benefit plan expected to be paid in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920
+ Details**Name:**us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of benefits from a defined benefit plan expected to be paid in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920
+ Details**Name:**us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of benefits from a defined benefit plan expected to be paid in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920
+ Details**Name:**us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of benefits from a defined benefit plan expected to be paid in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920
+ Details**Name:**us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12355-114930Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6749337Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6520858
+ Details**Name:**us-gaap_DefinedBenefitPlanFairValueOfPlanAssets**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.
+ References
No definition available.
+ Details**Name:**us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.
+ References
No definition available.
+ Details**Name:**us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Health Care Cost Trend Rate -URI http://asc.fasb.org/extlink&oid=6514820Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920
+ Details**Name:**us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedForNextFiscalYear**Namespace Prefix:**us-gaap_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920
+ Details**Name:**us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=73719040&loc=d3e4179-114921Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2417-114920
+ Details**Name:**us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=73719040&loc=d3e4179-114921Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2417-114920
+ Details**Name:**us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
If aggregate disclosures are presented, the aggregate projected benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2417-114920Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=73719040&loc=d3e4179-114921
+ Details**Name:**us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Target allocation of investments of this type to total plan assets presented on a weighted average basis.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920
+ Details**Name:**us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations**Namespace Prefix:**us-gaap_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Transfers in and out of Level 3. For example, transfers due to changes in the observability of significant inputs.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02)(C) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(02)(C) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920
+ Details**Name:**us-gaap_DefinedBenefitPlanTransfersBetweenMeasurementLevels**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The ultimate trend rate for health care costs.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920
+ Details**Name:**us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate**Namespace Prefix:**us-gaap_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period.
+ References
No definition available.
+ Details**Name:**us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920
+ Details**Name:**us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of the cost recognized during the period for defined contribution plans.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942
+ Details**Name:**us-gaap_DefinedContributionPlanCostRecognized**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Period expense related to postemployment benefits.
+ References
No definition available.
+ Details**Name:**us-gaap_PostemploymentBenefitsPeriodExpense**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747
+ Details**Name:**us-gaap_RestructuringCharges**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=us-gaap_OtherPensionPlansDefinedBenefitMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=us-gaap_UnitedStatesPostretirementBenefitPlansOfUSEntityDefinedBenefitMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                              |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=us-gaap_PensionPlansDefinedBenefitMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**dei_EntityByLocationAxis=nav_ChathamMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_RestructuringCostAndReserveAxis=us-gaap_FacilityClosingMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_CashAndCashEquivalentsMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=nav_UsLargeCapMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=nav_UsSmidCapMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                    |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=nav_CanadianEquityMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=nav_InternationalEquityMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=nav_EmergingMarketsEquityMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_EquityMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_CorporateBondSecuritiesMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_AssetBackedSecuritiesMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=nav_CommonAndPreferredStockMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=nav_U.S.EquityMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=nav_CanadianEquityOtherMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                              |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=nav_InternationalEquityOtherMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=nav_FixedIncomeMultiAssetCreditMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=nav_GlobalEquityMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=nav_FixedIncomeLongDurationCreditMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=nav_FixedIncomeHighYieldMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=nav_FixedIncomeCanadianBondMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=nav_GlobalRealEstateMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=nav_GlobalInfrastructureMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_CommoditiesInvestmentMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                    |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_HedgeFundsMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                            |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_PrivateEquityFundsMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_ExchangeTradedFundsMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=nav_MutualFundsMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                    |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_RealEstateMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                     |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_CommonStockMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FairValueByAssetClassAxis=nav_ReturnseekingAssetsMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FairValueByAssetClassAxis=nav_LiabilityhedgingAssetsMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_StatementBusinessSegmentsAxis=nav_NorthAmericaTruckMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**dei_EntityByLocationAxis=nav_IndianapolisandWaukeshaFoundryMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_RestructuringCostAndReserveAxis=nav_PensionAndOtherPostretirementContractualTerminationBenefitsMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                           |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201507Member**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |