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Income Taxes (Components of Income Before Income Taxes and Equity Earnings) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract]      
U.S. $ 10 $ (3) $ 18
Foreign 819 772 621
Income before income taxes $ 829 $ 769 $ 639