Noninterest Income - Foreign Exchange 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]
Revenue from contracts with customers	$ 350	$ 315	$ 1,070	$ 948
Revenue not from contract with customer	9	357	168	1,229
Foreign exchange fees	74	65	216	189
Spot contract commissions
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	74	65	215	188
Option premium fees
Disaggregation of Revenue [Line Items]
Revenue not from contract with customer	$ 0	$ 0	$ 1	$ 1