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Income Taxes - Schedule of Components of Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Income Tax Disclosure [Abstract] |  |  |  |
Deferred tax assets, depreciation | $ 21 | $ 10 |  |
Deferred tax assets, employee benefits | 364 | 368 |  |
Deferred tax assets, loss provisions | 24 | 36 |  |
Deferred tax assets, deferred income | 41 | 48 |  |
Deferred tax assets, interest | 3 | 56 |  |
Deferred tax assets, tax loss carryforwards | 3,267 | 2,819 |  |
Deferred tax assets, tax credit carryforwards | 378 | 379 |  |
Deferred tax assets, other | 7 | 23 |  |
Deferred tax assets, gross | 4,105 | 3,739 |  |
Valuation allowance | (2,307) | (2,121) | $ (2,357) | $ (2,459)
Deferred tax assets, net | 1,798 | 1,618 |  |
Deferred tax liabilities, depreciation | 506 | 480 |  |
Deferred tax liabilities, employee benefits | 0 | 6 |  |
Deferred tax liabilities, loss provisions | 1 | 0 |  |
Deferred tax liabilities, deferred expense | 1,033 | 939 |  |
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 | 13 | 0 |  |
Deferred tax liabilities, gross | 1,553 | 1,425 |  |
Deferred tax liabilities, valuation allowance | 0 | 0 |  |
Deferred tax liabilities, net | $ 1,553 | $ 1,425 |  |

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