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Income Taxes (Earnings Before Income Taxes) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
United States $ 1,104 $ 1,215 $ 1,155
Foreign 505 607 1,129
Earnings Before Income Taxes $ 1,609 $ 1,822 $ 2,284