Goodwill and Mortgage Servicing Rights - Mortgage Fees and Related Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Risk management:
All other	$ 1	$ 2	$ 3
Mortgage fees and related income	2,491	2,513	3,563
Consumer & Community Banking
CCB mortgage fees and related income
Net production revenue	853	769	1,190
Operating revenue:
Loan servicing revenue	2,336	2,776	3,303
Changes in MSR asset fair value due to collection/realization of expected cash flows	(916)	(917)	(905)
Total operating revenue	1,420	1,859	2,398
Risk management:
Changes in MSR asset fair value due to market interest rates	(72)	(160)	(1,606)
Other changes in MSR asset fair value due to inputs or assumptions in model	(91)	(245)	(218)
Change in derivative fair value and other	380	288	1,796
Total risk management	217	(117)	(28)
Total CCB net mortgage servicing revenue	1,637	1,742	2,370
Mortgage fees and related income	$ 2,490	$ 2,511	$ 3,560