Goodwill and Other Intangible Assets - Mortgage Servicing Rights (Details 3) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Mortgage servicing rights activity
Fair value at the beginning of the period	$ 7,949,000,000	$ 8,039,000,000	$ 7,614,000,000	$ 7,223,000,000
MSR activity
Originations of MSRs	652,000,000	524,000,000	1,342,000,000	1,096,000,000
Purchase of MSRs	3,000,000	2,000,000	(3,000,000)	3,000,000
Disposition of MSRs	(19,000,000)	0	(418,000,000)	0
Net additions and amortization	636,000,000	526,000,000	921,000,000	1,099,000,000
Servicing Asset at Fair Value, Changes due to collection/realization of expected cash flows	(288,000,000)	(328,000,000)	(547,000,000)	(681,000,000)
Changes due to market interest rates	1,074,000,000	(1,195,000,000)	1,620,000,000	(551,000,000)
Servicing Asset at Fair Value, Changes in valuation due to inputs and assumptions, projected cash flows	0	(77,000,000)	290,000,000	(295,000,000)
Servicing Asset at Fair Value, Changes in valuation due to inputs and assumptions, discount rates	0	0	(78,000,000)	0
Servicing Asset at Fair Value, Changes in valuation due to inputs and assumptions, prepayment model changes and other	(36,000,000)	153,000,000	(485,000,000)	323,000,000
Servicing Asset at Fair Value, Changes in Fair Value Resulting from Changes in Other Valuation Inputs or Changes in Assumptions	(36,000,000)	76,000,000	(273,000,000)	28,000,000
Total change in fair value of MSRs	1,038,000,000	(1,119,000,000)	1,347,000,000	(523,000,000)
Fair value at the end of the period	9,335,000,000	7,118,000,000	9,335,000,000	7,118,000,000
Change in unrealized gains/(losses) included in income related to MSRs held at March 31	1,038,000,000	(1,119,000,000)	1,347,000,000	(523,000,000)
Contractual service fees, late fees and other ancillary fees included in income	835,000,000	949,000,000	1,704,000,000	1,982,000,000
Third-party mortgage loans serviced at June 30 (in billions)	839,000,000,000	868,000,000,000	839,000,000,000	868,000,000,000
Servicer advances at June 30, (in billions)	10,100,000,000	10,200,000,000	10,100,000,000	10,200,000,000
MSR activity supplemental information
Commercial Real Estate, Fair Value, Period Increase (Decrease)		(3,000,000)	(2,000,000)	(5,000,000)
Commercial Real Estate, Fair Value	$ 21,000,000	$ 26,000,000	$ 21,000,000	$ 26,000,000