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Income Taxes (Income Tax (Benefit) Provision) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
United States, current federal tax expense (benefit) $ 90 $ 203 $ (70)
Current foreign tax expense (benefit) 182 432 182
Current state and local tax expense (benefit) 42 42 12
Current income tax expense (benefit) 314 677 124
United States, deferred federal income tax expense (benefit) 81 69 130
Deferred foreign income tax expense (benefit) (24) (406) (119)
Deferred state and local income tax expense (benefit) 11 8 15
Deferred income tax expense (benefit) 68 (329) 26
Total income tax expense $ 382 $ 348 $ 150