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Income Taxes (Schedule of Provision for Income Taxes) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current income tax expense:      
United States federal $ 80 $ (17) $ 178
United States state and local 20 46 30
International 207 324 177
Total current income tax expense 307 353 385
Deferred income tax (benefit) expense:      
United States federal 1 10 (44)
United States state and local (25) (1) (20)
International 72 117 (1,518)
Total deferred income tax (benefit) expense 48 126 (1,582)
Total income tax (benefit) expense $ 355 $ 479 $ (1,197)