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Income Taxes - Net Deferred Tax Liabilities Presented on Consolidated Balance Sheet (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]    
Long-term deferred tax assets $ 236 $ 268
Long-term deferred tax liabilities (323) (293)
Net deferred tax liabilities $ (87) $ (25)