Noninterest Income - Credit Card Fees (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Card interchange fees, net	$ 29	$ 29	$ 91	$ 78
Revenue from contracts with customers	350	315	1,070	948
Revenue not from contract with customer	9	357	168	1,229
Total credit card fees	37	34	114	93
Merchant service fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	6	4	18	12
Card service fees
Disaggregation of Revenue [Line Items]
Revenue not from contract with customer	$ 2	$ 1	$ 5	$ 3