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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]      
Income before income taxes, Domestic $ (168) $ (470) $ (2,095)
Income before income taxes, Foreign 209 78 (528)
Income before income taxes $ 41 $ (392) $ (2,623)