Income Taxes - Schedule of Effective Income Tax Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Federal income tax rate	21.00%	21.00%	21.00%
Tax computed at statutory rate	$ 211	$ 237	$ 243
Increase (decrease) resulting from:
State income taxes, net of federal income tax benefit	20	34	31
BOLI	(5)	(6)	(4)
Tax-exempt interest	(12)	(12)	(10)
FDIC premium	12	11	7
Non-deductible expenses	8	9	4
LIHTC credits and benefits, net of amortization	(13)	(15)	(16)
Other tax credits	(1)	(5)	(4)
Other changes in unrecognized tax benefits	(2)	(50)	(2)
Termination of BOLI policies	0	21	0
Other	(7)	(12)	(2)
Total	$ 211	$ 212	$ 247