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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Income Tax Disclosure [Abstract] |  |
Tax benefit of loss carryforwards | $ 747 | $ 715
Liabilities currently not deductible for tax | 171 | 188
Tax credit carryforwards | 59 | 22
Unrealized loss on cash flow hedges and retirement liabilities | 75 | 134
Others | 21 | 21
Deferred tax assets, Gross, Total | 1,073 | 1,080
Valuation allowance against tax benefit of loss carryforwards | (629) | (615)
Other valuation allowance | (129) | (66)
Deferred tax assets, Net, Total | 315 | 399
Tax depreciation in excess of book depreciation | 212 | 266
Other assets book value in excess of tax values | 60 | 57
Tax on undistributed foreign earnings | 106 | 98
Unrealized gain on cash flow hedges and retirement liabilities | 24 | 3
Deferred tax liabilities, Total | 402 | 424
Net deferred tax liabilities | $ (87) | $ (25)

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