Goodwill and Other Intangible Assets - Mortgage Fees and Related Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Risk management:
All other	$ 0	$ 1
Mortgage fees and related income	667	705
Consumer & Community Banking
CCB mortgage fees and related income
Net production revenue	162	237
Operating revenue:
Loan servicing revenue	616	749
Changes in MSR asset fair value due to collection/realization of expected cash flows	(240)	(214)
Total operating revenue	376	535
Risk management:
Changes in MSR asset fair value due to market interest rates and other	(762)	(476)
Other changes in MSR asset fair value due to inputs or assumptions in model	10	(102)
Change in derivative fair value and other	881	510
Total risk management	129	(68)
Total net mortgage servicing revenue	505	467
Mortgage fees and related income	$ 667	$ 704