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