Derivative Financial Instruments (Details 7) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Gains and losses on derivative instruments held for trading purposes
Amount of Gain (Loss) Recognized in income on Derivatives	$ (110)	$ 104	$ (874)	$ 272
Trading revenue [Member] | Interest rate contracts [Member]
Gains and losses on derivative instruments held for trading purposes
Amount of Gain (Loss) Recognized in income on Derivatives	(21)	(171)	(11)	(115)
Trading revenue [Member] | Foreign exchange contracts [Member]
Gains and losses on derivative instruments held for trading purposes
Amount of Gain (Loss) Recognized in income on Derivatives	246	203	645	249
Trading revenue [Member] | Equity contracts [Member]
Gains and losses on derivative instruments held for trading purposes
Amount of Gain (Loss) Recognized in income on Derivatives	42	2	60	3
Trading revenue [Member] | Precious Metals contracts [Member]
Gains and losses on derivative instruments held for trading purposes
Amount of Gain (Loss) Recognized in income on Derivatives	16	(47)	52	51
Trading revenue [Member] | Credit contracts [Member]
Gains and losses on derivative instruments held for trading purposes
Amount of Gain (Loss) Recognized in income on Derivatives	(450)	102	(1,668)	90
Trading revenue [Member] | Other [Member]
Gains and losses on derivative instruments held for trading purposes
Amount of Gain (Loss) Recognized in income on Derivatives	19	(17)	27	(4)
Residential mortgage banking revenue [Member] | Interest rate contracts [Member]
Gains and losses on derivative instruments held for trading purposes
Amount of Gain (Loss) Recognized in income on Derivatives	$ 38	$ 32	$ 21	$ (2)