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Income Taxes (Income Tax Rate Reconciliation) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Taxes [Abstract]      
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate $ 494 $ 547 $ 604
Effective Income Tax Rate, Continuing Operations 19.60% 20.50% 22.00%
Increase (decrease) in taxes resulting from: [Abstract]      
State income tax, net of federal tax effect $ 62 $ 72 $ 88
Affordable housing investment amortization, net of tax benefits (excluding Tax Reform) (48) (42) (32)
Tax-exempt interest (39) (38) (33)
Non-deductible expenses 29 33 34
Bank-owned life insurance (24) (19) (16)
Other, net (13) (20) (14)
Income tax expense $ 461 $ 533 $ 631