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Share-based Compensation and Employee Benefits - Schedule of Components of Net Benefit Cost and Other Amounts Recognized in Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Pension Benefits |  |  |
Components of net benefit cost (credit): |  |  |
Service cost | $ 59 | $ 53 | $ 52
Interest cost | 71 | 96 | 84
Expected return on assets | (137) | (129) | (149)
Amortization of prior service cost (credit) | 1 | 0 | 0
Amortization of net actuarial loss (gain) | 40 | 54 | 40
Net benefit cost (credit) | 34 | 74 | 27
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss: |  |  |
Net loss (gain) arising during period | 157 | (42) | 105
Amortization or settlement recognition of net actuarial (loss) gain | (40) | (54) | (87)
Amortization of prior service (cost) credit | (1) | 0 | (1)
Total recognized in total other comprehensive loss (income)(a) | 116 | (96) | 17
Total recognized in net benefit cost (credit) and other comprehensive loss (income) | 150 | (22) | 44
Pension Benefits | Retirement Plan Name, Other |  |  |
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss: |  |  |
Total recognized in total other comprehensive loss (income)(a) | 2 |  |
OPEB |  |  |
Components of net benefit cost (credit): |  |  |
Service cost | 1 | 1 | 1
Interest cost | 8 | 12 | 12
Expected return on assets | (16) | (16) | (20)
Amortization of prior service cost (credit) | (5) | (4) | (4)
Amortization of net actuarial loss (gain) | (13) | (11) | (6)
Net benefit cost (credit) | (25) | (18) | (17)
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss: |  |  |
Net loss (gain) arising during period | (43) | (17) | (32)
Amortization or settlement recognition of net actuarial (loss) gain | 13 | 11 | 3
Amortization of prior service (cost) credit | 3 | 2 | 3
Total recognized in total other comprehensive loss (income)(a) | (27) | (4) | (26)
Total recognized in net benefit cost (credit) and other comprehensive loss (income) | $ (52) | $ (22) | $ (43)

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