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Income Taxes - Provisions For Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current:      
Federal $ 307 $ 356 $ 499
State 68 83 131
Total current taxes 375 439 630
Deferred:      
Federal 111 280 156
State 31 50 17
Total deferred taxes 142 330 173
Income taxes $ 517 $ 769 $ 803