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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Income before income taxes, Domestic $ (4,501) $ (168) $ (470)
Income before income taxes, Foreign (1,961) 209 78
Income before income taxes $ (6,462) $ 41 $ (392)