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Income Taxes (Earnings Before Income Taxes) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
United States $ 972 $ 1,104 $ 1,215
Foreign 1,088 505 607
Earnings Before Income Taxes $ 2,060 $ 1,609 $ 1,822