DERIVATIVES ACTIVITIES (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Realized and unrealized gains and losses from derivative and non-derivative trading activities
Principal transactions	$ 1,931	$ 3,167
Interest rate contracts
Realized and unrealized gains and losses from derivative and non-derivative trading activities
Principal transactions	791	1,624
Foreign exchange contracts
Realized and unrealized gains and losses from derivative and non-derivative trading activities
Principal transactions	754	787
Equity contracts
Realized and unrealized gains and losses from derivative and non-derivative trading activities
Principal transactions	342	428
Commodity and other contracts
Realized and unrealized gains and losses from derivative and non-derivative trading activities
Principal transactions	(21)	(25)
Credit derivatives
Realized and unrealized gains and losses from derivative and non-derivative trading activities
Principal transactions	$ 65	$ 353