Noninterest Income - Lending Related Fees (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Lending related fees	$ 19	$ 16
Unused commitment fees
Accounts, Notes, Loans and Financing Receivable [Line Items]
Lending related fees	15	12
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Lending related fees	$ 4	$ 4