Noninterest Income - Client Investment 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
Sweep money market fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	64	12	144	31
Asset management fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	16	7	41	22
Repurchase agreement fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	39	1	52	2
Client investment fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 119	$ 20	$ 237	$ 55