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Income Taxes (Components of Earnings Before Income Taxes Between Domestic and Foreign Jurisdictions) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
U.S. $ 5,175 $ 6,828 $ 6,829
Non-U.S. 393 327 308
Earnings before income taxes $ 5,568 $ 7,155 $ 7,137