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Income Taxes - Domestic and Foreign Components of Income Before Income Taxes (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Income before income taxes, Domestic $ (2,095) $ (1,577) $ 1,415
Income before income taxes, Foreign (528) 988 2,079
Income before income taxes $ (2,623) $ (589) $ 3,494