Goodwill and Mortgage Servicing Rights - Mortgage Fees and Related Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Risk management:
All other	$ 0	$ 0	$ 0	$ 0
Mortgage fees and related income	279	324	675	789
Consumer & Community Banking
CCB mortgage fees and related income
Net production revenue	353	93	553	188
Operating revenue:
Loan servicing revenue	417	441	821	954
Changes in MSR asset fair value due to collection/realization of expected cash flows	(247)	(187)	(446)	(347)
Total operating revenue	170	254	375	607
Risk management:
Changes in MSR asset fair value due to market interest rates and other	(540)	104	(841)	486
Other changes in MSR asset fair value due to other inputs and assumptions in model	(286)	(9)	(284)	(7)
Change in derivative fair value and other	582	(118)	872	(485)
Total risk management	(244)	(23)	(253)	(6)
Total net mortgage servicing revenue	(74)	231	122	601
Mortgage fees and related income	$ 279	$ 324	$ 675	$ 789