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Income Taxes (Income Tax Rate Reconciliation) (Details) - USD ($) $ in Millions | 12 Months Ended
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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.

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