Noninterest Income - Lending Related Fees (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Lending related fees	$ 76	$ 57	$ 50
Unused commitment fees
Disaggregation of Revenue [Line Items]
Lending related fees	59	42	35
Other
Disaggregation of Revenue [Line Items]
Lending related fees	$ 17	$ 15	$ 15