Loans - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Accrued interest receivable	$ 1,200	$ 1,200
TDRs	1,600	2,100
Commitments to lend on loans modified in TDRs	168	173
Loans held for sale	5,888	2,710
Commercial and multifamily real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Payments for Origination of Mortgage Loans Held-for-sale	9,100	10,000	$ 9,000
Federal Home Loan banks
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans Pledged as Collateral	10,300	14,100
Line of Credit Facility, Remaining Borrowing Capacity	19,700	19,600
Federal Reserve Discount Window
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans Pledged as Collateral	26,500	25,500
Line of Credit Facility, Remaining Borrowing Capacity	19,600	20,000
Credit Card and Consumer Banking | Performing
Financing Receivable, Allowance for Credit Loss [Line Items]
TDRs	1,100	1,300
Commercial Banking | Performing
Financing Receivable, Allowance for Credit Loss [Line Items]
TDRs	192	442
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	$ 223	$ 602