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Income Taxes - Schedule of Components of Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Income Tax Disclosure [Abstract] |  |  |  |
Deferred tax assets, depreciation | $ 25 | $ 38 |  |
Deferred tax assets, employee benefits | 887 | 836 |  |
Deferred tax assets, loss provisions | 92 | 94 |  |
Deferred tax assets, deferred income | 96 | 22 |  |
Deferred tax assets, interest | 56 | 0 |  |
Deferred tax assets, tax loss carryforwards | 2,932 | 3,159 |  |
Deferred tax assets, tax credit carryforwards | 379 | 579 |  |
Deferred tax assets, other | 52 | 94 |  |
Deferred tax assets, gross | 4,519 | 4,822 |  |
Valuation allowance | (2,256) | (2,486) | $ (2,584) | $ (1,940)
Deferred tax assets, net | 2,263 | 2,336 |  |
Deferred tax liabilities, depreciation | 729 | 694 |  |
Deferred tax liabilities, employee benefits | 16 | 27 |  |
Deferred tax liabilities, loss provisions | 0 | 0 |  |
Deferred tax liabilities, deferred expense | 943 | 1,102 |  |
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 | 16 | 20 |  |
Deferred tax liabilities, gross | 1,704 | 1,843 |  |
Deferred tax liabilities, valuation allowance | 0 | 0 |  |
Deferred tax liabilities, net | $ 1,704 | $ 1,843 |  |

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