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Income Taxes - Income Before Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
U.S. income $ 336 $ 362 $ 481
Non-U.S. income 426 359 334
Income before income taxes and equity income $ 762 $ 721 $ 815