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Income Taxes - Income Taxes Included in Income Statement (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Currently payable:      
Federal $ 257 $ 368 $ 423
State 48 80 73
Total currently payable 305 448 496
Deferred:      
Federal (84) (14) 119
State (25) (12) 27
Total deferred (109) (26) 146
Total income tax expense (benefit) 196 422 642
Income tax (benefit) expense on securities transactions (3) 2 (2)
Equity and gross receipts based taxes assessed in lieu of income tax recorded in noninterest expense $ 34 $ 33 $ 33