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Income Taxes (Schedule of Provision for Income Taxes) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current income tax expense:      
United States federal $ 836 $ 94 $ 78
United States state and local 38 50 23
International 133 176 108
Total current income tax expense 1,007 320 209
Deferred income tax expense (benefit):      
United States federal 84 (17) 2
United States state and local (9) (12) 8
International (39) (17) 77
Total deferred income tax expense (benefit) 36 (46) 87
Total income tax expense $ 1,043 $ 274 $ 296