DERIVATIVES ACTIVITIES (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Trading derivatives
Derivatives
Derivative notionals	$ 55,587,607	$ 52,358,175
Trading derivatives | Interest rate contracts
Derivatives
Derivative notionals	44,021,876	42,169,179
Trading derivatives | Interest rate contracts | Swaps
Derivatives
Derivative notionals	31,154,330	30,050,856
Trading derivatives | Interest rate contracts | Futures and forwards
Derivatives
Derivative notionals	5,397,508	4,823,370
Trading derivatives | Interest rate contracts | Written options
Derivatives
Derivative notionals	3,871,649	3,752,905
Trading derivatives | Interest rate contracts | Purchased options
Derivatives
Derivative notionals	3,598,389	3,542,048
Trading derivatives | Foreign exchange contracts
Derivatives
Derivative notionals	7,635,411	6,437,697
Trading derivatives | Foreign exchange contracts | Swaps
Derivatives
Derivative notionals	1,375,941	1,393,368
Trading derivatives | Foreign exchange contracts | Futures and forwards
Derivatives
Derivative notionals	4,051,904	3,484,193
Trading derivatives | Foreign exchange contracts | Written options
Derivatives
Derivative notionals	1,097,717	781,698
Trading derivatives | Foreign exchange contracts | Purchased options
Derivatives
Derivative notionals	1,109,849	778,438
Trading derivatives | Equity contracts
Derivatives
Derivative notionals	768,718	713,689
Trading derivatives | Equity contracts | Swaps
Derivatives
Derivative notionals	101,404	96,039
Trading derivatives | Equity contracts | Futures and forwards
Derivatives
Derivative notionals	17,704	16,171
Trading derivatives | Equity contracts | Written options
Derivatives
Derivative notionals	335,816	320,243
Trading derivatives | Equity contracts | Purchased options
Derivatives
Derivative notionals	313,794	281,236
Trading derivatives | Commodity and other contracts
Derivatives
Derivative notionals	329,012	278,922
Trading derivatives | Commodity and other contracts | Swaps
Derivatives
Derivative notionals	29,318	27,323
Trading derivatives | Commodity and other contracts | Futures and forwards
Derivatives
Derivative notionals	101,703	75,897
Trading derivatives | Commodity and other contracts | Written options
Derivatives
Derivative notionals	96,410	86,418
Trading derivatives | Commodity and other contracts | Purchased options
Derivatives
Derivative notionals	101,581	89,284
Trading derivatives | Credit derivatives
Derivatives
Derivative notionals	2,832,590	2,758,688
Trading derivatives | Credit derivatives | Protection sold
Derivatives
Derivative notionals	1,380,859	1,346,494
Trading derivatives | Credit derivatives | Protection purchased
Derivatives
Derivative notionals	1,451,731	1,412,194
Hedging instruments under ASC 815 (SFAS 133)
Derivatives
Derivative notionals	213,325	207,893
Hedging instruments under ASC 815 (SFAS 133) | Interest rate contracts
Derivatives
Derivative notionals	123,918	114,296
Hedging instruments under ASC 815 (SFAS 133) | Interest rate contracts | Swaps
Derivatives
Derivative notionals	123,698	114,296
Hedging instruments under ASC 815 (SFAS 133) | Interest rate contracts | Futures and forwards
Derivatives
Derivative notionals	220
Hedging instruments under ASC 815 (SFAS 133) | Foreign exchange contracts
Derivatives
Derivative notionals	89,069	93,243
Hedging instruments under ASC 815 (SFAS 133) | Foreign exchange contracts | Swaps
Derivatives
Derivative notionals	20,847	22,207
Hedging instruments under ASC 815 (SFAS 133) | Foreign exchange contracts | Futures and forwards
Derivatives
Derivative notionals	67,399	70,484
Hedging instruments under ASC 815 (SFAS 133) | Foreign exchange contracts | Written options
Derivatives
Derivative notionals	129	96
Hedging instruments under ASC 815 (SFAS 133) | Foreign exchange contracts | Purchased options
Derivatives
Derivative notionals	694	456
Hedging instruments under ASC 815 (SFAS 133) | Credit derivatives
Derivatives
Derivative notionals	338	354
Hedging instruments under ASC 815 (SFAS 133) | Credit derivatives | Protection purchased
Derivatives
Derivative notionals	338	354
Hedging instruments under ASC 815 (SFAS 133) | Net investment hedge
Derivatives
Derivative notionals	5,123	4,888
Management hedges
Derivatives
Derivative notionals	278,263	251,676
Management hedges | Interest rate contracts
Derivatives
Derivative notionals	220,279	176,172
Management hedges | Interest rate contracts | Swaps
Derivatives
Derivative notionals	113,765	99,434
Management hedges | Interest rate contracts | Futures and forwards
Derivatives
Derivative notionals	80,937	45,856
Management hedges | Interest rate contracts | Written options
Derivatives
Derivative notionals	18,497	22,992
Management hedges | Interest rate contracts | Purchased options
Derivatives
Derivative notionals	7,080	7,890
Management hedges | Foreign exchange contracts
Derivatives
Derivative notionals	38,911	53,763
Management hedges | Foreign exchange contracts | Swaps
Derivatives
Derivative notionals	18,118	16,900
Management hedges | Foreign exchange contracts | Futures and forwards
Derivatives
Derivative notionals	20,664	33,768
Management hedges | Foreign exchange contracts | Written options
Derivatives
Derivative notionals		989
Management hedges | Foreign exchange contracts | Purchased options
Derivatives
Derivative notionals	129	2,106
Management hedges | Credit derivatives
Derivatives
Derivative notionals	19,073	21,741
Management hedges | Credit derivatives | Protection purchased
Derivatives
Derivative notionals	$ 19,073	$ 21,741