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Share-based Compensation and Employee Benefits - Pensions and Other Postretirement Benefit Plans - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Components of Accumulated Other Comprehensive Income/Loss |  |  |
Expected amortization in next year | $ 25 |  |
Expected amortization in next year, unrecognized net actuarial loss | 27 |  |
Expected amortization in next year, unrecognized prior service credit | $ 2 |  |
Savings plan - defined contribution plan |  |  |
Savings Plan |  |  |
Percentage of eligible compensation contributed | 5.00% |  |
Plan vesting period | 2 years |  |
Plan cost | $ 50 | $ 48 | $ 47
Pension Benefits |  |  |
Pension Plans and Other Postretirement Benefit Plans |  |  |
Percentage of employees covered | 100.00% |  |
Vesting period | 3 years |  |
Components of Accumulated Other Comprehensive Income/Loss |  |  |
Accumulated benefit obligation | $ 2,659 | 2,535 |
Expected Payment of Future Benefits and Employer Contributions |  |  |
Expected employer contributions in next year | $ 71 |  |
Pension Benefits | Minimum | Equities |  |  |
Plan Assets |  |  |
Target allocation percentage | 34.00% |  |
Pension Benefits | Minimum | Fixed Income Securities |  |  |
Plan Assets |  |  |
Target allocation percentage | 37.00% |  |
Pension Benefits | Minimum | Cash |  |  |
Plan Assets |  |  |
Target allocation percentage | 0.00% |  |
Pension Benefits | Minimum | Alternative Investments |  |  |
Plan Assets |  |  |
Target allocation percentage | 0.00% |  |
Pension Benefits | Minimum | Company Securities |  |  |
Plan Assets |  |  |
Target allocation percentage | 0.00% |  |
Pension Benefits | Maximum | Equities |  |  |
Plan Assets |  |  |
Target allocation percentage | 59.00% |  |
Pension Benefits | Maximum | Fixed Income Securities |  |  |
Plan Assets |  |  |
Target allocation percentage | 57.00% |  |
Pension Benefits | Maximum | Cash |  |  |
Plan Assets |  |  |
Target allocation percentage | 5.00% |  |
Pension Benefits | Maximum | Alternative Investments |  |  |
Plan Assets |  |  |
Target allocation percentage | 2.00% |  |
Pension Benefits | Maximum | Company Securities |  |  |
Plan Assets |  |  |
Target allocation percentage | 10.00% |  |
OPEB |  |  |
Pension Plans and Other Postretirement Benefit Plans |  |  |
Medicare participation, age | 65 |  |
Components of Accumulated Other Comprehensive Income/Loss |  |  |
Accumulated benefit obligation whose accumulated benefit obligations exceeded the fair value of plan assets | $ 288 | 293 |
Accumulated benefit obligation whose accumulated benefit obligations exceeded the fair value of plan assets, fair value of plan assets | 57 | $ 70 |
Expected Payment of Future Benefits and Employer Contributions |  |  |
Expected employer contributions in next year | $ 7 |  |
Actuarial Assumptions and Sensitivity Analysis |  |  |
Weighted-average annual rate of increase in the per capita cost of covered health care benefits | 8.38% |  |
Ultimate health care cost trend rate | 4.54% |  |
OPEB | Minimum | Equities |  |  |
Plan Assets |  |  |
Target allocation percentage | 45.00% |  |
OPEB | Minimum | Fixed Income Securities |  |  |
Plan Assets |  |  |
Target allocation percentage | 25.00% |  |
OPEB | Minimum | Cash |  |  |
Plan Assets |  |  |
Target allocation percentage | 0.00% |  |
OPEB | Maximum | Equities |  |  |
Plan Assets |  |  |
Target allocation percentage | 68.00% |  |
OPEB | Maximum | Fixed Income Securities |  |  |
Plan Assets |  |  |
Target allocation percentage | 50.00% |  |
OPEB | Maximum | Cash |  |  |
Plan Assets |  |  |
Target allocation percentage | 22.00% |  |
Accounting Standards Update 2017-07 | General and Administrative |  |  |
Pension and Other Postretirement Benefit Plans |  |  |
Impact of adoption of ASUs |  |  | (15)
Accounting Standards Update 2017-07 | Other, Net |  |  |
Pension and Other Postretirement Benefit Plans |  |  |
Impact of adoption of ASUs |  |  | $ 15

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