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Income Taxes (Domestic and Foreign Components of Income Before Income Tax Provision) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Domestic $ (155) $ 393 $ 349
Foreign 291 237 245
Income before income taxes $ 136 $ 630 $ 594