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Income Taxes - Income Before Income Taxes Showing Domestic and Foreign Source (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Domestic $ 1,681 $ 922 $ 1,601
Foreign 141 138 150
Income (loss) before income taxes $ 1,822 $ 1,060 $ 1,751