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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
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