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Income Taxes - Schedule of Components of Net Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Income Tax Disclosure [Abstract] |  |  |  |
Deferred tax assets, depreciation | $ 31 | $ 15 |  |
Deferred tax assets, employee benefits | 936 | 1,382 |  |
Deferred tax assets, loss provisions | 134 | 181 |  |
Deferred tax assets, deferred income | 19 | 20 |  |
Deferred tax assets, tax loss carryforwards | 3,305 | 1,540 |  |
Deferred tax assets, tax credit carryforwards | 638 | 652 |  |
Deferred tax assets, other | 24 | 164 |  |
Deferred tax assets, gross | 5,087 | 3,954 |  |
Valuation allowance | (2,584) | (1,940) | $ (1,291) | $ (1,151)
Deferred tax assets, net | 2,503 | 2,014 |  |
Deferred tax liabilities, depreciation | 693 | 817 |  |
Deferred tax liabilities, employee benefits | 23 | 8 |  |
Deferred tax liabilities, loss provisions | 14 | 1 |  |
Deferred tax liabilities, deferred expense | 1,144 | 74 |  |
Deferred tax liabilities, tax loss carryforwards | 0 | 0 |  |
Deferred tax liabilities, tax credit carryforwards | 0 | 0 |  |
Deferred tax liabilities, other | 33 | 19 |  |
Deferred tax liabilities, gross | 1,907 | 919 |  |
Deferred tax liabilities, valuation allowance | 0 | 0 |  |
Deferred tax liabilities, net | $ 1,907 | $ 919 |  |

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