Goodwill, Mortgage Servicing Rights, and Other Intangible Assets - Mortgage Fees and Related Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Risk management:
Mortgage fees and related income	$ 275	$ 221
All other	1	(2)
Consumer & Community Banking
CCB mortgage fees and related income
Production revenue	130	75
Operating revenue:
Loan servicing revenue	405	400
Changes in MSR asset fair value due to collection/realization of expected cash flows	(260)	(240)
Total operating revenue	145	160
Risk management:
Changes in MSR asset fair value due to market interest rates and other	268	(22)
Other changes in MSR asset fair value due to other inputs and assumptions in model	10	11
Changes in derivative fair value and other	(279)	(1)
Total risk management	(1)	(12)
Total net mortgage servicing revenue	144	148
Mortgage fees and related income	$ 274	$ 223