Goodwill and Other Intangible Assets - Mortgage Fees and Related Income (Details 4) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Risk management:
All other	$ 2	$ 2
Mortgage fees and related income	2,010	(487)
Retail Financial Services
Net production revenue:
Production revenue	1,432	679
Repurchase Losses	(302)	(420)
Net production revenue	1,130	259
Operating revenue:
Loan servicing revenue	1,039	1,052
Changes in MSR asset fair value due to modeled servicing portfolio runoff	(351)	(563)
Total operating revenue	688	489
Risk management:
Changes in MSR asset fair value due to market interest rates	644	379
Other changes in MSR asset fair value due to inputs or assumptions in model	(48)	(1,130)
Derivative valuation adjustments and other	(406)	(486)
Total risk management	190	(1,237)
Total RFS net mortgage servicing revenue	$ 878	$ (748)