Loans - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Accrued interest receivable	$ 2,200	$ 1,900
Financing Receivable, Pledged Status [Extensible Enumeration]	Asset Pledged as Collateral [Member]
Net loans held for investment	$ 305,176	299,091
Loans held for sale	854	203
Commercial and multifamily real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Payments for origination, loan	4,400	8,600	$ 9,100
Federal Home Loan banks
Financing Receivable, Allowance for Credit Loss [Line Items]
Net loans held for investment	7,400	9,800
Remaining borrowing capacity	32,100	19,900
Federal Reserve Discount Window
Financing Receivable, Allowance for Credit Loss [Line Items]
Net loans held for investment	78,300	34,100
Remaining borrowing capacity	41,400	19,700
Domestic credit card: | Domestic Credit Card and Commercial Banking Portfolios
Financing Receivable, Allowance for Credit Loss [Line Items]
Revolving loans converted to term during period	$ 617	$ 441