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Income Taxes (Income Before Income Taxes) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Taxes [Abstract]      
U.S. companies $ 472 $ 653 $ 2,658
Non-U.S. companies 1,031 1,004 1,034
Income before income taxes $ 1,503 $ 1,657 $ 3,692