Mortgage Banking Activity - Schedule of Residential Mortgage Loans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Loans Receivable Held-for-sale, Net, Reconciliation to Cash Flow [Roll Forward]
Balance at beginning of period	$ 502
Balance at end of period	551	$ 502
Mortgage loans
Loans Receivable Held-for-sale, Net, Reconciliation to Cash Flow [Roll Forward]
Balance at beginning of period	62	44	$ 250
Originations and purchases	951	692	1,275
Sales, net of gains	(932)	(674)	(1,481)
Balance at end of period	$ 81	$ 62	$ 44