Goodwill and Other Intangible Assets - Mortgage Fees and Related Income (Details 4) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Risk management:
All other	$ 0	$ 3	$ 2	$ 5
Mortgage fees and related income	2,265	1,103	4,275	616
Retail Financial Services
Net production revenue:
Production revenue	1,362	767	2,794	1,446
Repurchase Losses	(10)	(223)	(312)	(643)
Net production revenue	1,352	544	2,482	803
Operating revenue:
Loan servicing revenue	1,004	1,011	2,043	2,063
Changes in MSR asset fair value due to modeled amortization	(327)	(478)	(678)	(1,041)
Total operating revenue	677	533	1,365	1,022
Risk management:
Changes in MSR asset fair value due to market interest rates	(1,193)	(932)	(549)	(553)
Other changes in MSR asset fair value due to inputs or assumptions in model	76	(28)	28	(1,158)
Derivative valuation adjustments and other	1,353	983	947	497
Total risk management	236	23	426	(1,214)
Total RFS net mortgage servicing revenue	$ 913	$ 556	$ 1,791	$ (192)