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Income Taxes - Domestic and Foreign Components of Income (Loss) Before Income Taxes (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
United States $ 39 $ (64) $ (206)
Foreign 19 12 (24)
Income (loss) before income taxes $ 58 $ (52) $ (230)