Goodwill and Mortgage Servicing Rights - Mortgage Fees and Related Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Risk management:
All other	$ 1	$ 2	$ 3
Mortgage fees and related income	2,036	1,254	1,616
Consumer & Community Banking
CCB mortgage fees and related income
Net production revenue	1,618	268	636
Operating revenue:
Loan servicing revenue	1,533	1,835	2,014
Changes in MSR asset fair value due to collection/realization of expected cash flows	(951)	(740)	(795)
Total operating revenue	582	1,095	1,219
Risk management:
Changes in MSR asset fair value due to market interest rates and other	(893)	300	(202)
Other changes in MSR asset fair value due to other inputs and assumptions in model	(287)	(70)	(30)
Change in derivative fair value and other	1,015	(341)	(10)
Total risk management	(165)	(111)	(242)
Total net mortgage servicing revenue	417	984	977
Mortgage fees and related income	$ 2,035	$ 1,252	$ 1,613