Goodwill and Other Intangible Assets - Mortgage Fees and Related Income (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Risk management:
All other	$ 3	$ 10	$ 7
Mortgage fees and related income	3,563	5,205	8,687
Consumer & Community Banking
Net production revenue:
Production revenue	732	2,673	5,783
Repurchase (Losses)/Benefits	458	331	(272)
Net production revenue	1,190	3,004	5,511
Operating revenue:
Loan servicing revenue	3,303	3,552	3,772
Changes in MSR asset fair value due to modeled amortization	(905)	(1,094)	(1,222)
Total operating revenue	2,398	2,458	2,550
Risk management:
Changes in MSR asset fair value due to market interest rates	(1,606)	2,119	(587)
Other changes in MSR asset fair value due to inputs or assumptions in model	(218)	(511)	(46)
Derivative valuation adjustments and other	1,796	(1,875)	1,252
Total risk management	(28)	(267)	619
Total CCB net mortgage servicing revenue	$ 2,370	$ 2,191	$ 3,169