Goodwill, Mortgage Servicing Rights, and Other Intangible Assets - Mortgage Fees and Related Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Risk management:
Mortgage fees and related income	$ 402	$ 414	$ 1,025	$ 913
All other	12	(3)	15	(1)
Consumer & Community Banking
CCB mortgage fees and related income
Production revenue	154	162	441	339
Operating revenue:
Loan servicing revenue	409	409	1,226	1,211
Changes in MSR asset fair value due to collection/realization of expected cash flows	(273)	(265)	(795)	(760)
Total operating revenue	136	144	431	451
Risk management:
Changes in MSR asset fair value due to market interest rates and other	(251)	555	134	816
Other changes in MSR asset fair value due to other inputs and assumptions in model	70	41	82	44
Changes in derivative fair value and other	281	(485)	(78)	(736)
Total risk management	100	111	138	124
Total net mortgage servicing revenue	236	255	569	575
Mortgage fees and related income	$ 390	$ 417	$ 1,010	$ 914