Goodwill and Other Intangible Assets - Mortgage Servicing Rights (Details 3) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Mortgage servicing rights activity
Fair value at the beginning of the period	$ 7,223,000,000		$ 13,649,000,000
MSR activity
Originations of MSRs	572,000,000	757,000,000
Purchase of MSRs	1,000,000	1,000,000
Disposition of MSRs	0	0
Changes in fair value due to modeled amortization	(353,000,000)	(563,000,000)
Net additions and amortization	220,000,000	195,000,000
Changes in fair value due to market interest rates	644,000,000	379,000,000
Other changes in valuation due to inputs and assumptions	(48,000,000)	(1,130,000,000)
Total change in fair value of MSRs	596,000,000	(751,000,000)
Fair value at Dec 31	8,039,000,000	13,093,000,000	13,649,000,000
Change in unrealized gains/(losses) included in income related to MSRs held at March 31	596,000,000	(751,000,000)
Contractual service fees, late fees and other ancillary fees included in income	1,033,000,000	1,025,000,000
Third-party mortgage loans serviced at June 30 (in billions)	892,000,000,000	963,000,000,000
Servicer advances, net at June 30 (in billions)	11,200,000,000	10,800,000,000
MSR activity supplemental information
Servicing Asset At Fair Value Changes In Fair Value Resulting From Changes In Cost To Service Assumptions	1,100,000,000
Commercial Real Estate, Fair Value, Period Increase (Decrease)	(2,000,000)	(2,000,000)
Commercial Real Estate, Fair Value	29,000,000	38,000,000
Fair Value, Inputs, Level 3 [Member]
MSR activity supplemental information
Increase (decrease) in level 3 assets	(9,200,000,000)
Retail Financial Services [Member]
MSR activity supplemental information
Derivative, Gain (Loss) on Derivative, Net, Real Estate Mortgages Related, and Other Adjustments	$ (406,000,000)	$ (486,000,000)