Goodwill, Mortgage Servicing Rights, and Other Intangible Assets - Mortgage Fees and Related Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Risk management:
Mortgage fees and related income	$ 348	$ 278	$ 623	$ 499
All other	2	4	3	2
Consumer & Community Banking
CCB mortgage fees and related income
Production revenue	157	102	287	177
Operating revenue:
Loan servicing revenue	412	402	817	802
Changes in MSR asset fair value due to collection/realization of expected cash flows	(262)	(255)	(522)	(495)
Total operating revenue	150	147	295	307
Risk management:
Changes in MSR asset fair value due to market interest rates and other	117	283	385	261
Other changes in MSR asset fair value due to other inputs and assumptions in model	2	(8)	12	3
Changes in derivative fair value and other	(80)	(250)	(359)	(251)
Total risk management	39	25	38	13
Total net mortgage servicing revenue	189	172	333	320
Mortgage fees and related income	$ 346	$ 274	$ 620	$ 497