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Income Taxes (Provision for Income Taxes) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Current tax:      
U.S. federal $ 2 $ 0 $ (1)
State and foreign 239 161 165
Current tax, total 241 161 164
Deferred tax:      
U.S. federal 46 38 17
State and foreign (344) 0 (45)
Deferred tax, total (298) 38 (28)
Total $ (57) $ 199 $ 136