Goodwill and Other Intangible Assets - Mortgage Fees and Related Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Risk management:
All other	$ 2	$ 3	$ 10
Mortgage fees and related income	2,513	3,563	5,205
Consumer & Community Banking
CCB mortgage fees and related income
Net production revenue	769	1,190	3,004
Operating revenue:
Loan servicing revenue	2,776	3,303	3,552
Changes in MSR asset fair value due to collection/realization of expected cash flows	(917)	(905)	(1,094)
Total operating revenue	1,859	2,398	2,458
Risk management:
Changes in MSR asset fair value due to market interest rates	(160)	(1,606)	2,119
Other changes in MSR asset fair value due to inputs or assumptions in model	(245)	(218)	(511)
Change in derivative fair value and other	288	1,796	(1,875)
Total risk management	(117)	(28)	(267)
Total CCB net mortgage servicing revenue	1,742	2,370	2,191
Mortgage fees and related income	$ 2,511	$ 3,560	$ 5,195