Goodwill and Mortgage Servicing Rights - Mortgage Fees and Related Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Risk management:
Mortgage fees and related income	$ 460	$ 704
All other	4	1
Consumer & Community Banking
CCB mortgage fees and related income
Production revenue	211	757
Operating revenue:
Loan servicing revenue	368	248
Changes in MSR asset fair value due to collection/realization of expected cash flows	(232)	(187)
Total operating revenue	136	61
Risk management:
Changes in MSR asset fair value due to market interest rates and other	894	836
Other changes in MSR asset fair value due to other inputs and assumptions in model	65	(39)
Changes in derivative fair value and other	(850)	(912)
Total risk management	109	(115)
Total net mortgage servicing revenue	245	(54)
Mortgage fees and related income	$ 456	$ 703