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Federal, State, and Local Taxes - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax Disclosure [Abstract] |  |  |  |
Net operating loss carryforwards | $ 12 | $ 8 |  |
Total state net operating loss carryforwards | 262 |  |  |
Valuation allowance | 4 | 5 |  |
Low income housing tax credits | 335 | 372 |  |
Affordable housing tax credit commitment | $ 139 | 210 |  |
Commitments that expect to be funded period | 3 years |  |  |
Affordable housing tax credits | $ 41 | 34 | $ 11 |
Affordable housing tax credit amortization | 37 | 30 | 10 |
Affordable housing tax credit write down | 0 | 0 | 0 |
Unrecognized tax benefits | 43 | 42 | 40 | $ 39
Would impact effective rate rate amount | 34 | 34 |  |
Income tax expense interest and penalties | 8 | 8 | $ 4 |
Income tax accrued interest expense and penalties | 42 | $ 34 |  |
Unrecognized tax benefit decrease | 21 |  |  |
Bad debt reserve | 62 |  |  |
Federal deferred tax liability, bad debt reserve | $ 13 |  |  |
Investment, Proportional Amortization Method, Elected, Statement of Financial Position [Extensible Enumeration] | Other assets | Other assets |  |
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Cash Flows [Extensible Enumeration] | Income tax (benefit)/expense |  |  |
Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Cash Flows [Extensible Enumeration] | Income tax (benefit)/expense |  |  |
Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Income or Comprehensive Income [Extensible Enumeration] | Net (loss) income |  |  |
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Income or Comprehensive Income [Extensible Enumeration] | Net (loss) income |  |  |

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