Noninterest Income - Investment Banking Revenue (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
Underwriting fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	304	353	153
Advisory fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	90	40	38
Private placements and other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 65	$ 21	$ 4