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Income Taxes (Schedule of Provision for Income Taxes) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current income tax expense:      
United States federal $ 178 $ 836 $ 94
United States state and local 30 38 50
International 177 133 176
Total current income tax expense 385 1,007 320
Deferred income tax (benefit) expense:      
United States federal (44) 84 (17)
United States state and local (20) (9) (12)
International (1,518) (39) (17)
Total deferred income tax (benefit) expense expense (1,582) 36 (46)
Total income tax (benefit) expense $ (1,197) $ 1,043 $ 274