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Income Taxes - Income (Loss) Before Taxes (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Income before taxes, United States $ (55) $ (841) $ (3,103)
Income before taxes, Outside United States 2,679 (342) 1,198
Income (loss) before taxes $ 2,624 $ (1,183) $ (1,905)