DERIVATIVES ACTIVITIES (Details) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Derivative Notionals
Hedging instruments	$ 291,487	$ 287,998
Trading derivatives	53,384,562	47,517,847
Management hedges	289,417	293,682
Notional amount of a foreign currency denominated debt instrument to hedge the foreign currency risk of a net investment in a foreign operation	7,879	8,023
Interest rate contracts
Derivative Notionals
Hedging instruments	158,930	155,972
Trading derivatives	42,166,527	38,695,495
Management hedges	207,080	208,911
Interest rate contracts | Swaps
Derivative Notionals
Hedging instruments	158,930	155,972
Trading derivatives	29,418,507	27,084,014
Management hedges	138,688	135,979
Interest rate contracts | Futures and forwards
Derivative Notionals
Trading derivatives	4,093,642	4,874,209
Management hedges	39,854	46,140
Interest rate contracts | Written options
Derivative Notionals
Trading derivatives	4,257,002	3,431,608
Management hedges	19,618	8,762
Interest rate contracts | Purchased options
Derivative Notionals
Trading derivatives	4,397,376	3,305,664
Management hedges	8,920	18,030
Foreign exchange contracts
Derivative Notionals
Hedging instruments	128,393	127,098
Trading derivatives	6,205,363	4,999,589
Management hedges	58,070	56,245
Foreign exchange contracts | Swaps
Derivative Notionals
Hedging instruments	28,156	29,599
Trading derivatives	1,171,516	1,118,610
Management hedges	22,517	27,830
Foreign exchange contracts | Futures and forwards
Derivative Notionals
Hedging instruments	65,712	79,168
Trading derivatives	3,423,837	2,745,922
Management hedges	34,827	28,191
Foreign exchange contracts | Written options
Derivative Notionals
Hedging instruments	1,504	1,772
Trading derivatives	831,964	599,025
Management hedges	632	50
Foreign exchange contracts | Purchased options
Derivative Notionals
Hedging instruments	33,021	16,559
Trading derivatives	778,046	536,032
Management hedges	94	174
Equity contracts
Derivative Notionals
Trading derivatives	1,736,943	1,052,593
Equity contracts | Swaps
Derivative Notionals
Trading derivatives	92,394	67,637
Equity contracts | Futures and forwards
Derivative Notionals
Trading derivatives	17,090	19,816
Equity contracts | Written options
Derivative Notionals
Trading derivatives	829,618	491,519
Equity contracts | Purchased options
Derivative Notionals
Trading derivatives	797,841	473,621
Commodity and other contracts
Derivative Notionals
Trading derivatives	312,631	257,815
Commodity and other contracts | Swaps
Derivative Notionals
Trading derivatives	27,531	19,213
Commodity and other contracts | Futures and forwards
Derivative Notionals
Trading derivatives	71,651	115,578
Commodity and other contracts | Written options
Derivative Notionals
Trading derivatives	95,554	61,248
Commodity and other contracts | Purchased options
Derivative Notionals
Trading derivatives	117,895	61,776
Credit derivatives
Derivative Notionals
Hedging instruments	4,164	4,928
Trading derivatives	2,963,098	2,512,355
Management hedges	24,267	28,526
Credit derivatives | Protection sold
Derivative Notionals
Trading derivatives	1,439,423	1,223,116
Credit derivatives | Protection purchased
Derivative Notionals
Hedging instruments	4,164	4,928
Trading derivatives	1,523,675	1,289,239
Management hedges	$ 24,267	$ 28,526