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Income Taxes - Summary of Deferred Income Taxes Provided on Temporary Differences (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]    
Tax depreciation in excess of book depreciation $ 62 $ 58
Tax amortization in excess of book amortization 10 2
Liabilities currently (not deductible) deductible for tax (7) 5
Net tax losses benefited (18) (31)
Change in valuation allowance on deferred tax assets (2) (12)
Tax on undistributed foreign earnings 9 8
US tax reform (61)  
Others 4 (10)
Deferred income tax, Total $ (3) $ 20