Derivative Instruments - Impact on Statements of Income, Trading Derivatives (Details 2e) (Principal transactions revenue, USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Trading derivative gains and losses
Derivative-related gains/(losses)	$ 1,730	$ 1,288	$ 7,492	$ 7,161
Foreign exchange
Trading derivative gains and losses
Derivative-related gains/(losses)	228	428	1,059	1,479
Equity
Trading derivative gains and losses
Derivative-related gains/(losses)	269	500	1,840	1,407
Credit derivatives
Trading derivative gains and losses
Derivative-related gains/(losses)	840	773	2,794	4,185
Commodity
Trading derivative gains and losses
Derivative-related gains/(losses)	1,311	16	2,704	449
Interest rate
Trading derivative gains and losses
Derivative-related gains/(losses)	$ (918)	$ (429)	$ (905)	$ (359)