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Income Taxes (Income Tax Rate Reconciliation) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income Taxes [Abstract]      
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate $ 604 $ 675 $ 276
Effective Income Tax Rate, Continuing Operations 22.00% 21.60% 16.80%
Increase (decrease) in taxes resulting from: [Abstract]      
State income tax, net of federal tax effect $ 88 $ 83 $ 42
Non-deductible expenses 34 18 22
Tax-exempt interest (33) (30) (34)
Affordable housing investment amortization, net of tax benefits (excluding Tax Reform) (32) (25) (31)
Bank-owned life insurance (16) (20) (22)
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 0 0 (23)
Other, net (14) (7) (10)
Income tax expense [1] $ 631 $ 694 $ 220
[1] Income tax expense includes gross amortization of affordable housing investments of $149 million, $139 million, and $133 million for 2022, 2021 and 2020, respectively.