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Pensions and Other Postretirement Benefits - Other Changes Recognized in Other Comprehensive Loss (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recognized in other comprehensive income | $ 140 | $ (101) | $ 148
Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net loss arising during the year | 139 |  |
Amortization of net losses | (51) |  |
Amortization of prior service (cost) benefit | (1) |  |
Total recognized in other comprehensive income | 87 |  |
Total recognized in net periodic cost and other comprehensive income | 63 |  |
OPEB |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net loss arising during the year | 28 |  |
Amortization of net losses | 0 |  |
Amortization of prior service (cost) benefit | 25 |  |
Total recognized in other comprehensive income | 53 |  |
Total recognized in net periodic cost and other comprehensive income | $ 32 |  |

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