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Income Taxes - Schedule of Components of Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Income Tax Disclosure [Abstract] |  |  |  |
Deferred tax assets, depreciation | $ 8 | $ 11 |  |
Deferred tax assets, employee benefits | 240 | 232 |  |
Deferred tax assets, loss provisions | 28 | 26 |  |
Deferred tax assets, deferred income | 32 | 62 |  |
Deferred tax assets, interest | 32 | 99 |  |
Deferred tax assets, tax loss carryforwards | 2,905 | 2,955 |  |
Deferred tax assets, tax credit carryforwards | 216 | 268 |  |
Deferred tax assets, other | 10 | 6 |  |
Deferred tax assets, gross | 3,471 | 3,659 |  |
Valuation allowance | (1,821) | (1,965) | $ (2,279) | $ (2,307)
Deferred tax assets, net | 1,650 | 1,694 |  |
Deferred tax liabilities, depreciation | 486 | 492 |  |
Deferred tax liabilities, employee benefits | 4 | 1 |  |
Deferred tax liabilities, loss provisions | 1 | 1 |  |
Deferred tax liabilities, deferred expense | 1,210 | 1,161 |  |
Deferred tax liabilities, interest | 0 | 0 |  |
Deferred tax liabilities, tax loss carryforwards | 0 | 0 |  |
Deferred tax liabilities, tax credit carryforwards | 0 | 0 |  |
Deferred tax liabilities, other | 4 | 6 |  |
Deferred tax liabilities, gross | $ 1,705 | $ 1,661 |  |

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