DERIVATIVES ACTIVITIES (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Realized and unrealized gains and losses from derivative and non-derivative trading activities
Principal transactions	$ 976	$ 2,103	$ 4,547	$ 7,886
Interest rate contracts
Realized and unrealized gains and losses from derivative and non-derivative trading activities
Principal transactions	427	1,972	2,289	5,318
Foreign exchange contracts
Realized and unrealized gains and losses from derivative and non-derivative trading activities
Principal transactions	676	576	1,880	1,958
Equity contracts
Realized and unrealized gains and losses from derivative and non-derivative trading activities
Principal transactions	(43)	(358)	303	217
Commodity and other contracts
Realized and unrealized gains and losses from derivative and non-derivative trading activities
Principal transactions	8	107	71	131
Credit derivatives
Realized and unrealized gains and losses from derivative and non-derivative trading activities
Principal transactions	$ (92)	$ (194)	$ 4	$ 262