Derivatives and Hedging Activities (Details 10) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Derivative Instruments, Gain (Loss) By Hedging Relationship [Abstract]
Fair Value, Net Derivatives Measured on Recurring Basis, Gain (Loss) Included in Market Making Revenue	$ (903,000,000)	$ 2,350,000,000
Fair Value, Net Derivatives Measured on Recurring Basis, Gain (Loss) Included in Other Principal Transactions Revenue	(251,000,000)	62,000,000
Gain (Loss) Recognized On Hedged Borrowings and Bank Deposits	665,000,000	(6,300,000,000)	(3,447,000,000)
Foreign Currency Denominated Debt Designated As Foreign Currency Hedge	2,770,000,000	3,110,000,000
Derivative, Net Hedge Ineffectiveness Gain (Loss)	(1,718,000,000)	(1,621,000,000)	(1,836,000,000)
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness	0	0	0
Foreign Exchange Contract [Member]
Derivative Instruments, Gain (Loss) By Hedging Relationship [Abstract]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Net	0	(186,000,000)	0
Fair Value Hedging [Member] | Interest Rate Contract [Member]
Derivative Instruments, Gain (Loss) By Hedging Relationship [Abstract]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	$ (2,383,000,000)	$ 4,679,000,000	$ 1,617,000,000