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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
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Income Tax Disclosure [Abstract] |  |
Tax benefit of loss carryforwards | $ 614 | $ 686
Liabilities currently not deductible for tax | 211 | 231
Tax credit carryforwards | 24 | 25
Unrealized loss on cash flow hedges and retirement liabilities | 154 | 119
Others | 16 | 12
Deferred tax assets, Gross, Total | 1,019 | 1,073
Valuation allowance against tax benefit of loss carryforwards | (562) | (637)
Other valuation allowance | (50) | (80)
Deferred tax assets, Net, Total | 407 | 356
Tax depreciation in excess of book depreciation | 249 | 212
Tax on undistributed foreign earnings | 10 | 7
Unrealized gain on cash flow hedges and retirement liabilities | 9 | 9
Deferred tax liabilities, Total | 268 | 228
Net deferred tax assets | $ 139 | $ 128

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