Premises and Equipment - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Operating lease liability	$ 677	$ 677	$ 717
Operating Lease Liability Statement Of Financial Position Extensible List	Accrued interest and other liabilities	Accrued interest and other liabilities	Accrued interest and other liabilities
Period of non-cancelable operating lease (in years)		17 years
Right Of Use Asset And Leasehold Improvements
Property, Plant and Equipment [Line Items]
Impairment loss	$ 12
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Impairment loss	$ 15