DERIVATIVES ACTIVITIES (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Realized and unrealized gains and losses from derivative and non-derivative trading activities
Principal transactions	$ 1,640	$ 2,616	$ 3,571	$ 5,783
Interest rate contracts
Realized and unrealized gains and losses from derivative and non-derivative trading activities
Principal transactions	1,071	1,722	1,862	3,346
Foreign exchange contracts
Realized and unrealized gains and losses from derivative and non-derivative trading activities
Principal transactions	450	595	1,204	1,382
Equity contracts
Realized and unrealized gains and losses from derivative and non-derivative trading activities
Principal transactions	4	147	346	575
Commodity and other contracts
Realized and unrealized gains and losses from derivative and non-derivative trading activities
Principal transactions	84	49	63	24
Credit derivatives
Realized and unrealized gains and losses from derivative and non-derivative trading activities
Principal transactions	$ 31	$ 103	$ 96	$ 456