Goodwill and Mortgage Servicing Rights - Mortgage Fees and Related Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Risk management:
Mortgage fees and related income	$ 378	$ 551	$ 838	$ 1,255
All other	1	3	5	4
Consumer & Community Banking
CCB mortgage fees and related income
Production revenue	150	517	361	1,274
Operating revenue:
Loan servicing revenue	435	316	803	564
Changes in MSR asset fair value due to collection/realization of expected cash flows	(236)	(182)	(468)	(369)
Total operating revenue	199	134	335	195
Risk management:
Changes in MSR asset fair value due to market interest rates and other	653	(500)	1,547	336
Other changes in MSR asset fair value due to other inputs and assumptions in model	1	(28)	66	(67)
Changes in derivative fair value and other	(626)	425	(1,476)	(487)
Total risk management	28	(103)	137	(218)
Total net mortgage servicing revenue	227	31	472	(23)
Mortgage fees and related income	$ 377	$ 548	$ 833	$ 1,251