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Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current income tax expense:      
U.S. federal $ 2,179 $ 2,107 $ 2,136
U.S. state and local 272 335 264
Non-U.S. 342 416 412
Total current income tax expense 2,793 2,858 2,812
Deferred income tax expense (benefit):      
U.S. federal (45) (23) 352
U.S. state and local (8) (5) 39
Non-U.S. (52) (55) (97)
Total deferred income tax expense (105) (83) 294
Income tax provision (benefit) $ 2,688 $ 2,775 $ 3,106