Goodwill and Other Intangible Assets - Mortgage Servicing Rights (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Mortgage servicing rights activity [Abstract]
Fair value at the beginning of the period	$ 7,223,000,000	$ 13,649,000,000	$ 15,531,000,000
MSR activity
Originations of MSRs	2,376,000,000	2,570,000,000	3,153,000,000
Purchase of MSRs	457,000,000	33,000,000	26,000,000
Disposition of MSRs	(579,000,000)	0	(407,000,000)
Changes in fair value due to modeled amortization	(1,228,000,000)	(1,910,000,000)	(2,386,000,000)
Net additions and amortization	1,026,000,000	693,000,000	386,000,000
Changes in fair value due to market interest rates	(589,000,000)	(5,392,000,000)	(2,224,000,000)
Other changes in valuation due to inputs and assumptions	(46,000,000)	(1,727,000,000)	(44,000,000)
Total change in fair value of MSRs	(635,000,000)	(7,119,000,000)	(2,268,000,000)
Fair value at Dec 31	7,614,000,000	7,223,000,000	13,649,000,000
Change in unrealized gains/(losses) included in income related to MSRs held at December 31	(635,000,000)	(7,119,000,000)	(2,268,000,000)
Contractual service fees, late fees and other ancillary fees included in income	3,783,000,000	3,977,000,000	4,484,000,000
Third-party mortgage loans serviced at December 31 (in billions)	867,000,000,000	910,000,000,000	976,000,000,000
Servicer advances at December 31 (in billions)	10,900,000,000	11,100,000,000	9,900,000,000
MSR activity supplemental information
Commercial Real Estate, Fair Value, Period Increase (Decrease)	(8,000,000)	(9,000,000)	(1,000,000)
Commercial Real Estate, Fair Value	23,000,000	31,000,000	40,000,000
Servicing Asset At Fair Value Changes In Fair Value Resulting From Changes In Cost To Service Assumptions		(1,700,000,000)
Option Adjusted Spread Assumption Used To Value Mortgage Servicing Rights [Member]
MSR activity
Other changes in valuation due to inputs and assumptions		1,200,000,000
MSR activity supplemental information
Servicing Asset at Fair Value, Change in Option Adjusted Spread Assumptions		4.00%
Prepayment Model Used To Value Mortgage Servicing Rights [Member]
MSR activity
Other changes in valuation due to inputs and assumptions		1,200,000,000
Consumer & Community Banking [Member]
MSR activity supplemental information
Derivative, Gain (Loss) on Derivative, Net, Real Estate Mortgages Related, and Other Adjustments	$ 1,252,000,000	$ 5,553,000,000	$ 3,404,000,000