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Income Taxes - Schedule of Components of Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Income Tax Disclosure [Abstract] |  |  |  |
Deferred tax assets, depreciation | $ 38 | $ 31 |  |
Deferred tax assets, employee benefits | 836 | 936 |  |
Deferred tax assets, loss provisions | 94 | 134 |  |
Deferred tax assets, deferred income | 22 | 19 |  |
Deferred tax assets, tax loss carryforwards | 3,159 | 3,305 |  |
Deferred tax assets, tax credit carryforwards | 579 | 638 |  |
Deferred tax assets, other | 94 | 24 |  |
Deferred tax assets, gross | 4,822 | 5,087 |  |
Valuation allowance | (2,486) | (2,584) | $ (1,940) | $ (1,291)
Deferred tax assets, net | 2,336 | 2,503 |  |
Deferred tax liabilities, depreciation | 694 | 693 |  |
Deferred tax liabilities, employee benefits | 27 | 23 |  |
Deferred tax liabilities, loss provisions | 0 | 14 |  |
Deferred tax liabilities, deferred expense | 1,102 | 1,144 |  |
Deferred tax liabilities, tax loss carryforwards | 0 | 0 |  |
Deferred tax liabilities, tax credit carryforwards | 0 | 0 |  |
Deferred tax liabilities, other | 20 | 33 |  |
Deferred tax liabilities, gross | 1,843 | 1,907 |  |
Deferred tax liabilities, valuation allowance | 0 | 0 |  |
Deferred tax liabilities, net | $ 1,843 | $ 1,907 |  |

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