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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
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)