| **Employee Benefits Schedule of Defined Benefit Plan Disclosures (Details) - USD ($) $ in Millions**              | 3 Months Ended | 12 Months Ended |
|-------------------------------------------------------------------------------------------------------------------|----------------|-----------------|
||
| **Defined Benefit Plan Disclosure [Line Items]**                                                                  |           |            |   |   |
| Debt Securities— Domestic Government Other Postretirement Benefit Plan Assets                               |           | $ 4             | $ 5 |   |
| **Fair value of plan assets:**                                                                                    |           |            |   |   |
| Benefit payments                                                                                                  | $ (16)         |            |   |   |
| As of January 1                                                                                                   |           |            | 550 |   |
| **Classification in consolidated balance sheet:**                                                                 |           |            |   |   |
| Noncurrent asset                                                                                                  |           | (34)            | (33) |   |
| Noncurrent liability                                                                                              |           | (281)           | (259) |   |
| Fair Value, Inputs, Level 3 [Member]                                                                              |           |            |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                  |           |            |   |   |
| Debt Securities— Domestic Government Other Postretirement Benefit Plan Assets                               |           | 0               | 0 |   |
| **Fair value of plan assets:**                                                                                    |           |            |   |   |
| As of January 1                                                                                                   |           | 0               | 0 |   |
| Fair Value, Inputs, Level 1 [Member]                                                                              |           |            |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                  |           |            |   |   |
| Debt Securities— Domestic Government Other Postretirement Benefit Plan Assets                               |           | 0               | 0 |   |
| **Fair value of plan assets:**                                                                                    |           |            |   |   |
| As of January 1                                                                                                   |           | 52              | 44 |   |
| Fair Value, Inputs, Level 2 [Member]                                                                              |           |            |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                  |           |            |   |   |
| Debt Securities— Domestic Government Other Postretirement Benefit Plan Assets                               |           | 4               | 5 |   |
| **Fair value of plan assets:**                                                                                    |           |            |   |   |
| As of January 1                                                                                                   |           | 0               | 0 |   |
| Pension Plans, Defined Benefit [Member]                                                                           |           |            |   |   |
| **Benefit obligation:**                                                                                           |           |            |   |   |
| As of January 1                                                                                                   |           | 797             | 758 | $ 777 |
| **Fair value of plan assets:**                                                                                    |           |            |   |   |
| Service cost                                                                                                      |           | 16              | 18 | 15 |
| Interest cost on benefit obligation                                                                               |           | 33              | 31 | 34 |
| Participants’ contributions                                                                                 |           | 0               | 0 |   |
| Actuarial loss (gain)                                                                                             |           | 26              | (31) |   |
| Defined Benefit Plan, Special Termination Benefits                                                                |           | 0               | 0 |   |
| Benefit payments                                                                                                  |           | (34)            | (35) |   |
| Defined Benefit Plan, Administration Expenses                                                                     |           | (2)             | (2) |   |
| As of January 1                                                                                                   |           | 559             | 550 | 591 |
| Unfunded position as of December 31                                                                               |           | 238             | 208 |   |
| Net actuarial loss (gain) included in comprehensive income                                                        |           | 21              | 13 |   |
| Defined Benefit Plan, Amortization of Gains (Losses)                                                              |           | (14)            | (20) | (17) |
| Defined Benefit Plan, Amortization of Prior Service Cost (Credit)                                                 |           | 0               | 0 | 0 |
| Total Amounts included in comprehensive income                                                                    |           | 7               | (7) |   |
| Defined Benefit Plan, Accumulated Benefit Obligation                                                              |           | 714             | 681 |   |
| Actual return on plan assets                                                                                      |           | 45              | (4) |   |
| Company contributions                                                                                             |           | 0               | 0 |   |
| **Classification in consolidated balance sheet:**                                                                 |           |            |   |   |
| Noncurrent asset                                                                                                  |           | 0               | 0 |   |
| Current liability                                                                                                 |           | 0               | 0 |   |
| Noncurrent liability                                                                                              |           | (238)           | (208) |   |
| **Amounts included in AOCL:**                                                                                     |           |            |   |   |
| Net actuarial loss                                                                                                |           | 236             | 228 |   |
| Prior service cost                                                                                                |           | 0               | 0 |   |
| Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax         |           | $ 236           | $ 228 |   |
| **Assumptions used:**                                                                                             |           |            |   |   |
| Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Obligation, Discount Rate                 |           | 4.17%           | 4.36% |   |
| Discount rate used to calculate benefit obligation                                                                |           | 4.36%           | 4.02% |   |
| Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Obligation, Rate of Compensation Increase |           | 3.65%           | 3.65% |   |
| Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase       |           | 3.65%           | 3.65% |   |
| Long-term rate of return on plan assets                                                                           |           | 7.50%           | 7.50% |   |
| Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets |           | 7.50%           | 7.50% |   |
| Other Postretirement Benefit Plans [Member]                                                                       |           |            |   |   |
| **Benefit obligation:**                                                                                           |           |            |   |   |
| As of January 1                                                                                                   |           | $ 73            | $ 81 | 83 |
| **Fair value of plan assets:**                                                                                    |           |            |   |   |
| Service cost                                                                                                      |           | 2               | 2 | 2 |
| Interest cost on benefit obligation                                                                               |           | 4               | 3 | 4 |
| Participants’ contributions                                                                                 |           | 2               | 2 |   |
| Actuarial loss (gain)                                                                                             |           | (11)            | (4) |   |
| Defined Benefit Plan, Special Termination Benefits                                                                |           | 0               | 1 |   |
| Benefit payments                                                                                                  |           | (5)             | (6) |   |
| Defined Benefit Plan, Administration Expenses                                                                     |           | 0               | 0 |   |
| As of January 1                                                                                                   |           | 30              | 30 | 32 |
| Unfunded position as of December 31                                                                               |           | 43              | 51 |   |
| Net actuarial loss (gain) included in comprehensive income                                                        |           | (10)            | 0 |   |
| Defined Benefit Plan, Amortization of Gains (Losses)                                                              |           | 0               | (1) | (1) |
| Defined Benefit Plan, Amortization of Prior Service Cost (Credit)                                                 |           | (1)             | (1) | (1) |
| Total Amounts included in comprehensive income                                                                    |           | (11)            | (2) |   |
| Actual return on plan assets                                                                                      |           | 1               | (2) |   |
| Company contributions                                                                                             |           | 2               | 4 |   |
| **Classification in consolidated balance sheet:**                                                                 |           |            |   |   |
| Noncurrent asset                                                                                                  |           | 0               | 0 |   |
| Current liability                                                                                                 |           | 0               | 0 |   |
| Noncurrent liability                                                                                              |           | (43)            | (51) |   |
| **Amounts included in AOCL:**                                                                                     |           |            |   |   |
| Net actuarial loss                                                                                                |           | (2)             | 9 |   |
| Prior service cost                                                                                                |           | 1               | 1 |   |
| Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax         |           | $ (1)           | $ 10 |   |
| **Assumptions used:**                                                                                             |           |            |   |   |
| Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Obligation, Discount Rate                 |           | 3.75%           | 3.90% |   |
| Defined Benefit Plan Discount rate - upper range                                                                  |           | 4.23%           | 4.45% |   |
| Discount rate used to calculate benefit obligation                                                                |           | 3.90%           | 3.07% |   |
| Defined Benefit Plan Cost Discount rate - upper range                                                             |           | 4.45%           | 4.10% |   |
| Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Obligation, Rate of Compensation Increase |           | 4.58%           | 4.58% |   |
| Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase       |           | 4.58%           | 4.58% |   |
| Long-term rate of return on plan assets                                                                           |           | 6.26%           | 6.29% |   |
| Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets |           | 6.29%           | 6.37% |   |
| Non Qualified Benefit Plans [Member]                                                                              |           |            |   |   |
| **Benefit obligation:**                                                                                           |           |            |   |   |
| As of January 1                                                                                                   |           | $ 27            | $ 27 | 27 |
| **Fair value of plan assets:**                                                                                    |           |            |   |   |
| Service cost                                                                                                      |           | 0               | 0 | 0 |
| Interest cost on benefit obligation                                                                               |           | 1               | 1 | 1 |
| Participants’ contributions                                                                                 |           | 0               | 0 |   |
| Actuarial loss (gain)                                                                                             |           | 1               | 1 |   |
| Defined Benefit Plan, Special Termination Benefits                                                                |           | 0               | 0 |   |
| Benefit payments                                                                                                  |           | (2)             | (2) |   |
| Defined Benefit Plan, Administration Expenses                                                                     |           | 0               | 0 |   |
| As of January 1                                                                                                   |           | 16              | 15 | 15 |
| Unfunded position as of December 31                                                                               |           | 11              | 12 |   |
| Net actuarial loss (gain) included in comprehensive income                                                        |           | 1               | 1 |   |
| Defined Benefit Plan, Amortization of Gains (Losses)                                                              |           | (1)             | (1) | (1) |
| Defined Benefit Plan, Amortization of Prior Service Cost (Credit)                                                 |           | 0               | 0 | $ 0 |
| Total Amounts included in comprehensive income                                                                    |           | 0               | 0 |   |
| Defined Benefit Plan, Accumulated Benefit Obligation                                                              |           | 27              | 27 |   |
| Actual return on plan assets                                                                                      |           | 1               | 0 |   |
| Company contributions                                                                                             |           | 2               | 2 |   |
| **Classification in consolidated balance sheet:**                                                                 |           |            |   |   |
| Noncurrent asset                                                                                                  |           | (16)            | (15) |   |
| Current liability                                                                                                 |           | (2)             | (2) |   |
| Noncurrent liability                                                                                              |           | (25)            | (25) |   |
| **Amounts included in AOCL:**                                                                                     |           |            |   |   |
| Net actuarial loss                                                                                                |           | 13              | 13 |   |
| Prior service cost                                                                                                |           | 0               | 0 |   |
| Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax         |           | $ 13            | $ 13 |   |
| **Assumptions used:**                                                                                             |           |            |   |   |
| Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Obligation, Discount Rate                 |           | 4.17%           | 4.36% |   |
| Discount rate used to calculate benefit obligation                                                                |           | 4.36%           | 4.02% |   |

| X                                                                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Debt securities—Domestic Government Other Postretirement Benefit Plan Assets
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Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Obligation, rate of Compensation Increase
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Defined Benefit Plan Cost Discount rate - upper range
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| - Definition
The interest rate used to adjust for the time value of money for the Defiend Benefit Plan Discount rate - upper range.
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| - Definition
Long-term rate of return on plan assets
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| - Definition
Net actuarial loss from Defined Benefit Plans included in Accumulated Other Comprehensive Income.
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| - Definition
The net increase or decrease of changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.included in comprehensive income
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| - Definition
Total Amounts included in comprehensive income during the period from Defined Benefit Plans.
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| - Definition
The amount of cash, securities, or other assets held by a third-party trustee pursuant to the terms of an agreement which assets are available to be used by beneficiaries to that agreement only within the specific terms thereof and which agreement is expected to terminate more than one year from the balance sheet date (or operating cycle, if longer) at which time the assets held-in-trust will be released or forfeited.
+ References
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| - Definition
For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.
+ References
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| - Definition
The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.
+ References
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| - Definition
Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.
+ References
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| - Definition
Amount of plan administration expenses deducted from total plan assets.
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No definition available.
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| - Definition
The amount of gains or losses recognized in net periodic benefit cost.
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| - Definition
The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.
+ References
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| - Definition
Amount before tax, after reclassification adjustments, of prior service cost (credit) that has not been recognized in the income statement.
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| - Definition
The interest rate used to adjust for the time value of money.
+ References
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| - Definition
An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.
+ References
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| - Definition
Expected rate of compensation increases (for pay-related plans).
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date.  2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of contributions made by the employer to defined benefit plans.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of contributions made by plan participants. This item represents a periodic increase to the plan obligation and an increase to plan assets.
+ References
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| - 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.
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| - References
No definition available.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
If aggregate disclosures are presented, the aggregate benefit obligation for plans with benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of increase related to special termination benefits offered to and accepted by employees in connection with their termination of employment that are only offered for a short period of time. A situation involving termination benefits may also involve a curtailment.
+ References
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| - Definition
Amount after tax and reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans.
+ References
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