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Income Taxes - Income Tax Provision (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Current:      
Federal $ 2,285 $ 2,615 $ 2,450
State 665 518 565
Total current taxes 2,950 3,133 3,015
Deferred:      
Federal (306) (450) (535)
State (122) (114) (114)
Total deferred income taxes (428) (564) (649)
Total $ 2,522 $ 2,569 $ 2,366