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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Savings plan - defined contribution plan |  |  |
Pension and Other Postretirement Benefit Plans |  |  |
Percentage of eligible compensation contributed | 5.00% |  |
Plan vesting period | 2 years |  |
Plan cost | $ 53 | $ 50 | $ 48
Pension Benefits |  |  |
Pension and Other Postretirement Benefit Plans |  |  |
Percentage of employees covered | 100.00% |  |
Vesting period | 3 years |  |
Accumulated benefit obligation | $ 2,804 | 2,659 |
Expected Payment of Future Benefits and Employer Contributions |  |  |
Expected employer contributions in next year | $ 56 |  |
Pension Benefits | Minimum | Equities |  |  |
Plan Assets |  |  |
Target allocation percentage | 31.00% |  |
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 | 55.00% |  |
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 and Other Postretirement Benefit Plans |  |  |
Medicare participation, age | 65 |  |
Accumulated benefit obligation whose accumulated benefit obligations exceeded the fair value of plan assets | $ 255 | 288 |
Accumulated benefit obligation whose accumulated benefit obligations exceeded the fair value of plan assets, fair value of plan assets | 48 | $ 57 |
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 | 5.80% |  |
Ultimate health care cost trend rate | 4.50% |  |
OPEB | Minimum | Equities |  |  |
Plan Assets |  |  |
Target allocation percentage | 46.00% |  |
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% |  |

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