| **Fair Value Measurements - Carrying Values and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Millions**                                                                                                                                                                                                           | Jul. 31, 2016 | Oct. 31, 2015 |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| Reported Value Measurement [Member]                                                                                                                                                                                                                                                                                                          |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Retail Notes                                                                                                                                                                                                                                                                                                                                 |               | $ 136         |  | $ 166 |
| Notes Receivable                                                                                                                                                                                                                                                                                                                             |               | 1             |  | 3 |
| Estimate of Fair Value Measurement [Member]                                                                                                                                                                                                                                                                                                  |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Retail Notes                                                                                                                                                                                                                                                                                                                                 |               | 144           |  | 170 |
| Notes Receivable                                                                                                                                                                                                                                                                                                                             |               | 1             |  | 3 |
| Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                                                                                                           |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Retail Notes                                                                                                                                                                                                                                                                                                                                 |               | 0             |  | 0 |
| Notes Receivable                                                                                                                                                                                                                                                                                                                             |               | 0             |  | 0 |
| Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                                                                                                           |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Retail Notes                                                                                                                                                                                                                                                                                                                                 |               | 0             |  | 0 |
| Notes Receivable                                                                                                                                                                                                                                                                                                                             |               | 0             |  | 0 |
| Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                                                                                                           |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Retail Notes                                                                                                                                                                                                                                                                                                                                 |               | 144           |  | 170 |
| Notes Receivable                                                                                                                                                                                                                                                                                                                             |               | 1             |  | 3 |
| Line of Credit [Member] | Manufacturing Operations [Member]                                                                                                                                                                                                                                                                                  |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt                                                                                                                                                                                                                                                                                                                               |               | 1,020         |  | 1,023 |
| Line of Credit [Member] | Manufacturing Operations [Member] | Reported Value Measurement [Member]                                                                                                                                                                                                                                            |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt                                                                                                                                                                                                                                                                                                                               |               | 1,020         |  | 1,023 |
| Line of Credit [Member] | Manufacturing Operations [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                                                                                    |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 973           |  | 1,014 |
| Line of Credit [Member] | Manufacturing Operations [Member] | Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                                             |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 0             |  | 0 |
| Line of Credit [Member] | Manufacturing Operations [Member] | Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                                             |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 0             |  | 0 |
| Line of Credit [Member] | Manufacturing Operations [Member] | Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                                             |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 973           |  | 1,014 |
| Line of Credit [Member] | Financial Services Operations [Member]                                                                                                                                                                                                                                                                             |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt                                                                                                                                                                                                                                                                                                                               |               | 874           |  | 1,063 |
| Line of Credit [Member] | Financial Services Operations [Member] | Reported Value Measurement [Member]                                                                                                                                                                                                                                       |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt                                                                                                                                                                                                                                                                                                                               |               | 874           |  | 1,063 |
| Line of Credit [Member] | Financial Services Operations [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                                                                               |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 860           |  | 1,048 |
| Line of Credit [Member] | Financial Services Operations [Member] | Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                                        |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 0             |  | 0 |
| Line of Credit [Member] | Financial Services Operations [Member] | Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                                        |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 0             |  | 0 |
| Line of Credit [Member] | Financial Services Operations [Member] | Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                                        |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 860           |  | 1,048 |
| Debt Of Majority Owned Dealerships [Member] | Manufacturing Operations [Member]                                                                                                                                                                                                                                                              |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt                                                                                                                                                                                                                                                                                                                               |               | 13            |  | 28 |
| Debt Of Majority Owned Dealerships [Member] | Manufacturing Operations [Member] | Reported Value Measurement [Member]                                                                                                                                                                                                                        |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt                                                                                                                                                                                                                                                                                                                               |               | 13            |  | 28 |
| Debt Of Majority Owned Dealerships [Member] | Manufacturing Operations [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                                                                |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 15            |  | 28 |
| Debt Of Majority Owned Dealerships [Member] | Manufacturing Operations [Member] | Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                         |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 0             |  | 0 |
| Debt Of Majority Owned Dealerships [Member] | Manufacturing Operations [Member] | Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                         |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 0             |  | 0 |
| Debt Of Majority Owned Dealerships [Member] | Manufacturing Operations [Member] | Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                         |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 15            |  | 28 |
| Financing Arrangements [Member] | Manufacturing Operations [Member] | Reported Value Measurement [Member]                                                                                                                                                                                                                                    |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt                                                                                                                                                                                                                                                                                                                               |               | 38            |  | 43 |
| Financing Arrangements [Member] | Manufacturing Operations [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                                                                            |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 15            |  | 17 |
| Financing Arrangements [Member] | Manufacturing Operations [Member] | Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                                     |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 0             |  | 0 |
| Financing Arrangements [Member] | Manufacturing Operations [Member] | Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                                     |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 0             |  | 0 |
| Financing Arrangements [Member] | Manufacturing Operations [Member] | Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                                     |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 15            |  | 17 |
| Tax Exempt Bond [Member] | Manufacturing Operations [Member]                                                                                                                                                                                                                                                                                 |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt                                                                                                                                                                                                                                                                                                                               |               | 225           |  | 225 |
| Tax Exempt Bond [Member] | Manufacturing Operations [Member] | Reported Value Measurement [Member]                                                                                                                                                                                                                                           |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt                                                                                                                                                                                                                                                                                                                               |               | 225           |  | 225 |
| Tax Exempt Bond [Member] | Manufacturing Operations [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                                                                                   |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 227           |  | 233 |
| Tax Exempt Bond [Member] | Manufacturing Operations [Member] | Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                                            |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 0             |  | 0 |
| Tax Exempt Bond [Member] | Manufacturing Operations [Member] | Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                                            |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 227           |  | 233 |
| Tax Exempt Bond [Member] | Manufacturing Operations [Member] | Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                                            |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 0             |  | 0 |
| Financed lease obligations [Member] | Manufacturing Operations [Member]                                                                                                                                                                                                                                                                      |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt                                                                                                                                                                                                                                                                                                                               |               | 61            |  | 111 |
| Financed lease obligations [Member] | Manufacturing Operations [Member] | Reported Value Measurement [Member]                                                                                                                                                                                                                                |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt                                                                                                                                                                                                                                                                                                                               |               | 61            |  | 111 |
| Financed lease obligations [Member] | Manufacturing Operations [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                                                                        |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 61            |  | 111 |
| Financed lease obligations [Member] | Manufacturing Operations [Member] | Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                                 |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 0             |  | 0 |
| Financed lease obligations [Member] | Manufacturing Operations [Member] | Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                                 |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 0             |  | 0 |
| Financed lease obligations [Member] | Manufacturing Operations [Member] | Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                                 |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 61            |  | 111 |
| Notes Payable, Other Payables [Member] | Manufacturing Operations [Member]                                                                                                                                                                                                                                                                   |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt                                                                                                                                                                                                                                                                                                                               |               | 10            |  | 15 |
| Notes Payable, Other Payables [Member] | Manufacturing Operations [Member] | Reported Value Measurement [Member]                                                                                                                                                                                                                             |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt                                                                                                                                                                                                                                                                                                                               |               | 10            |  | 15 |
| Notes Payable, Other Payables [Member] | Manufacturing Operations [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                                                                     |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 10            |  | 17 |
| Notes Payable, Other Payables [Member] | Manufacturing Operations [Member] | Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                              |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 0             |  | 0 |
| Notes Payable, Other Payables [Member] | Manufacturing Operations [Member] | Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                              |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 0             |  | 0 |
| Notes Payable, Other Payables [Member] | Manufacturing Operations [Member] | Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                              |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 10            |  | 17 |
| Secured Debt [Member] | Financial Services Operations [Member]                                                                                                                                                                                                                                                                               |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt                                                                                                                                                                                                                                                                                                                               |               | 867           |  | 870 |
| Secured Debt [Member] | Financial Services Operations [Member] | Reported Value Measurement [Member]                                                                                                                                                                                                                                         |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt                                                                                                                                                                                                                                                                                                                               |               | 867           |  | 870 |
| Secured Debt [Member] | Financial Services Operations [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                                                                                 |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 863           |  | 865 |
| Secured Debt [Member] | Financial Services Operations [Member] | Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                                          |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 0             |  | 0 |
| Secured Debt [Member] | Financial Services Operations [Member] | Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                                          |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 0             |  | 0 |
| Secured Debt [Member] | Financial Services Operations [Member] | Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                                          |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 863           |  | 865 |
| Commercial Paper [Member] | Financial Services Operations [Member]                                                                                                                                                                                                                                                                           |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt                                                                                                                                                                                                                                                                                                                               |               | 93            |  | 86 |
| Commercial Paper [Member] | Financial Services Operations [Member] | Reported Value Measurement [Member]                                                                                                                                                                                                                                     |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt                                                                                                                                                                                                                                                                                                                               |               | 93            |  | 86 |
| Commercial Paper [Member] | Financial Services Operations [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                                                                             |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 93            |  | 86 |
| Commercial Paper [Member] | Financial Services Operations [Member] | Fair Value, Inputs, Level 1 [Member]                                                                                                                                                                                                                                    |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 93            |  |   |
| Commercial Paper [Member] | Financial Services Operations [Member] | Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                                      |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               |          |  | 86 |
| Commercial Paper [Member] | Financial Services Operations [Member] | Fair Value, Inputs, Level 2 [Member]                                                                                                                                                                                                                                    |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 0             |  |   |
| Commercial Paper [Member] | Financial Services Operations [Member] | Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                                      |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               |          |  | 0 |
| Commercial Paper [Member] | Financial Services Operations [Member] | Fair Value, Inputs, Level 3 [Member]                                                                                                                                                                                                                                    |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 0             |  |   |
| Commercial Paper [Member] | Financial Services Operations [Member] | Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                                      |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               |          |  | 0 |
| Borrowings Secured By Operating and Finance Leases [Member] | Financial Services Operations [Member]                                                                                                                                                                                                                                         |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt                                                                                                                                                                                                                                                                                                                               |               | 100           |  | 81 |
| Borrowings Secured By Operating and Finance Leases [Member] | Financial Services Operations [Member] | Reported Value Measurement [Member]                                                                                                                                                                                                   |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt                                                                                                                                                                                                                                                                                                                               |               | 100           |  | 81 |
| Borrowings Secured By Operating and Finance Leases [Member] | Financial Services Operations [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                                           |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 100           |  | 80 |
| Borrowings Secured By Operating and Finance Leases [Member] | Financial Services Operations [Member] | Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                    |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 0             |  | 0 |
| Borrowings Secured By Operating and Finance Leases [Member] | Financial Services Operations [Member] | Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                    |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 0             |  | 0 |
| Borrowings Secured By Operating and Finance Leases [Member] | Financial Services Operations [Member] | Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                    |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 100           |  | 80 |
| Eight Point Two Five Percent Senior Notes [Member] | Notes Payable to Banks [Member] | Manufacturing Operations [Member]                                                                                                                                                                                                                     |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt                                                                                                                                                                                                                                                                                                                               |               | 1,184         |  | 1,182 |
| Eight Point Two Five Percent Senior Notes [Member] | Notes Payable to Banks [Member] | Manufacturing Operations [Member] | Reported Value Measurement [Member]                                                                                                                                                                               |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt                                                                                                                                                                                                                                                                                                                               |               | 1,184         |  | 1,182 |
| Eight Point Two Five Percent Senior Notes [Member] | Notes Payable to Banks [Member] | Manufacturing Operations [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                                                       |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 893           |  | 998 |
| Eight Point Two Five Percent Senior Notes [Member] | Notes Payable to Banks [Member] | Manufacturing Operations [Member] | Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 893           |  | 998 |
| Eight Point Two Five Percent Senior Notes [Member] | Notes Payable to Banks [Member] | Manufacturing Operations [Member] | Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 0             |  | 0 |
| Eight Point Two Five Percent Senior Notes [Member] | Notes Payable to Banks [Member] | Manufacturing Operations [Member] | Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 0             |  | 0 |
| Four Point Five Zero Senior Subordinated Convertible Notes [Member] | Convertible Subordinated Debt [Member] | Manufacturing Operations [Member]                                                                                                                                                                                             |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt                                                                                                                                                                                                                                                                                                                               |               | 189           |  | 186 |
| Four Point Five Zero Senior Subordinated Convertible Notes [Member] | Convertible Subordinated Debt [Member] | Manufacturing Operations [Member] | Reported Value Measurement [Member]                                                                                                                                                       |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt                                                                                                                                                                                                                                                                                                                               | [1]           | 189           |  | 186 |
| Four Point Five Zero Senior Subordinated Convertible Notes [Member] | Convertible Subordinated Debt [Member] | Manufacturing Operations [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                               |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   | [1]           | 137           |  | 148 |
| Four Point Five Zero Senior Subordinated Convertible Notes [Member] | Convertible Subordinated Debt [Member] | Manufacturing Operations [Member] | Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                        |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   | [1]           | 0             |  | 0 |
| Four Point Five Zero Senior Subordinated Convertible Notes [Member] | Convertible Subordinated Debt [Member] | Manufacturing Operations [Member] | Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                        |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   | [1]           | 0             |  | 0 |
| Four Point Five Zero Senior Subordinated Convertible Notes [Member] | Convertible Subordinated Debt [Member] | Manufacturing Operations [Member] | Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]                                                                                                        |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   | [1]           | 137           |  | 148 |
| Four Point Seven Five Senior Subordinated Convertible Notes [Member] [Member] | Convertible Subordinated Debt [Member] | Manufacturing Operations [Member]                                                                                                                                                                                   |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt                                                                                                                                                                                                                                                                                                                               |               | 385           |  | 379 |
| Four Point Seven Five Senior Subordinated Convertible Notes [Member] [Member] | Convertible Subordinated Debt [Member] | Manufacturing Operations [Member] | Reported Value Measurement [Member]                                                                                                                                             |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt                                                                                                                                                                                                                                                                                                                               | [1]           | 385           |  | 379 |
| Four Point Seven Five Senior Subordinated Convertible Notes [Member] [Member] | Convertible Subordinated Debt [Member] | Manufacturing Operations [Member] | Estimate of Fair Value Measurement [Member]                                                                                                                                     |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   | [1]           | 258           |  | 289 |
| Four Point Seven Five Senior Subordinated Convertible Notes [Member] [Member] | Convertible Subordinated Debt [Member] | Manufacturing Operations [Member] | Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]                                                                                              |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   | [1]           | 0             |  | 0 |
| Four Point Seven Five Senior Subordinated Convertible Notes [Member] [Member] | Convertible Subordinated Debt [Member] | Manufacturing Operations [Member] | Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]                                                                                              |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   |               | 0             | [1] | 0 |
| Four Point Seven Five Senior Subordinated Convertible Notes [Member] [Member] | Convertible Subordinated Debt [Member] | Manufacturing Operations [Member] | Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]                                                                                              |               |          |  |   |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                            |               |          |  |   |
| Long-term Debt, Fair Value                                                                                                                                                                                                                                                                                                                   | [1]           | $ 258         |  | $ 289 |
|                                                                                                                                                                                                                                                                                                                                              |
| [1]The carrying value represents the consolidated financial statement amount of the debt which excludes the allocation of the conversion feature to equity, while the fair value is based on internally developed valuation techniques such as discounted cash flow modeling for Level 3 convertible notes which include the equity feature. |

| 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_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Glossary Loan -URI http://asc.fasb.org/extlink&oid=6517073
+ Details**Name:**us-gaap_LoansReceivableFairValueDisclosure**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682
+ Details**Name:**us-gaap_LongTermDebt**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.
+ References
No definition available.
+ Details**Name:**us-gaap_LongTermDebtFairValue**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value portion of an agreement for an unconditional promise by the maker to pay the holder a definite sum of money at a future date.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682
+ Details**Name:**us-gaap_NotesReceivableFairValueDisclosure**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                       |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FairValueByMeasurementBasisAxis=us-gaap_CarryingReportedAmountFairValueDisclosureMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                    |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FairValueByMeasurementBasisAxis=us-gaap_EstimateOfFairValueFairValueDisclosureMember**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_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_StatementBusinessSegmentsAxis=nav_ManufacturingOperationsMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_StatementBusinessSegmentsAxis=nav_FinancialServicesOperationsMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_LongtermDebtTypeAxis=nav_DebtOfMajorityOwnedDealershipsMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_LongtermDebtTypeAxis=nav_FinancingArrangementsMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_LongtermDebtTypeAxis=nav_TaxExemptBondMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_LongtermDebtTypeAxis=nav_FinancedLeaseObligationsMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                            |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_LongtermDebtTypeAxis=us-gaap_NotesPayableOtherPayablesMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                              |
|------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_LongtermDebtTypeAxis=us-gaap_SecuredDebtMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_LongtermDebtTypeAxis=us-gaap_CommercialPaperMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_LongtermDebtTypeAxis=nav_BorrowingsSecuredByOperatingAndFinanceLeasesMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DebtInstrumentAxis=nav_EightPointTwoFivePercentSeniorNotesMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_LongtermDebtTypeAxis=us-gaap_NotesPayableToBanksMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DebtInstrumentAxis=nav_FourPointFiveZeroSeniorSubordinatedConvertibleNotesMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_LongtermDebtTypeAxis=us-gaap_ConvertibleSubordinatedDebtMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                       |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DebtInstrumentAxis=nav_FourPointSevenFiveSeniorSubordinatedConvertibleNotesMemberMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |