Noninterest Income - Client Investment Fees (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 1,314	$ 1,057	$ 880
Sweep money market fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	43	74	104
Asset management fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	31	43	29
Repurchase agreement fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1	15	49
Client investment fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 75	$ 132	$ 182