Loans - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Line Items]
Accrued interest receivable	$ 2,000		$ 1,900
Commitments to lend on loans modified in TDRs		$ 156
Financing Receivable, Pledged Status [Extensible Enumeration]	Asset Pledged as Collateral [Member]
Net loans held for investment	$ 294,518		299,091
Loans held for sale	363		203
Federal Home Loan banks
Financing Receivable, Allowance for Credit Loss [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	19,700		19,900
Net loans held for investment	9,200		9,800
Federal Reserve Discount Window
Financing Receivable, Allowance for Credit Loss [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	16,900		19,700
Net loans held for investment	32,900		$ 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	$ 183	$ 291