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Income Taxes - Components of Income from Continuing Operations Before Income Taxes (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
United States $ 84 $ 124 $ 207
Foreign 330 59 (94)
Income from continuing operations before income taxes $ 414 $ 183 $ 113