Loans - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Line Items]
Accrued interest receivable	$ 2,100		$ 2,100		$ 1,900
Commitments to lend on loans modified in TDRs	$ 48	$ 166	$ 48	$ 166
Financing Receivable, Pledged Status [Extensible Enumeration]	Asset Pledged as Collateral [Member]		Asset Pledged as Collateral [Member]
Net loans held for investment	$ 296,677		$ 296,677		299,091
Loans held for sale	1,211		1,211		203
Federal Home Loan banks
Financing Receivable, Allowance for Credit Loss [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	34,200		34,200		19,900
Net loans held for investment	8,300		8,300		9,800
Federal Reserve Discount Window
Financing Receivable, Allowance for Credit Loss [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	41,500		41,500		19,700
Net loans held for investment	70,200		70,200		$ 34,100
Domestic credit card: | Domestic Credit Card and Commercial Banking Portfolios [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Revolving loans converted to term during period	$ 159	$ 41	$ 342	$ 332