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, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Risk management:
All other	$ 4	$ 0	$ 6	$ 2
Mortgage fees and related income	1,823	2,265	3,275	4,275
Consumer & Community Banking
Net production revenue:
Production revenue	1,064	1,362	2,059	2,794
Repurchase Losses	16	(10)	(65)	(312)
Net production revenue	1,080	1,352	1,994	2,482
Operating revenue:
Loan servicing revenue	945	1,004	1,881	2,043
Changes in MSR asset fair value due to modeled amortization	(285)	(327)	(543)	(678)
Total operating revenue	660	677	1,338	1,365
Risk management:
Changes in MSR asset fair value due to market interest rates	1,072	(1,193)	1,618	(549)
Other changes in MSR asset fair value due to inputs or assumptions in model	(36)	76	(273)	28
Change in derivative fair value and other	(957)	1,353	(1,408)	947
Total risk management	79	236	(63)	426
Net mortgage servicing revenue	$ 739	$ 913	$ 1,275	$ 1,791