DERIVATIVES ACTIVITIES (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Trading derivatives
Derivatives
Derivative notionals	$ 57,757,364	$ 52,358,175
Trading derivatives | Interest rate contracts
Derivatives
Derivative notionals	46,398,777	42,169,179
Trading derivatives | Interest rate contracts | Swaps
Derivatives
Derivative notionals	32,216,909	30,050,856
Trading derivatives | Interest rate contracts | Futures and forwards
Derivatives
Derivative notionals	6,040,887	4,823,370
Trading derivatives | Interest rate contracts | Written options
Derivatives
Derivative notionals	4,169,564	3,752,905
Trading derivatives | Interest rate contracts | Purchased options
Derivatives
Derivative notionals	3,971,417	3,542,048
Trading derivatives | Foreign exchange contracts
Derivatives
Derivative notionals	7,454,134	6,437,697
Trading derivatives | Foreign exchange contracts | Swaps
Derivatives
Derivative notionals	1,410,503	1,393,368
Trading derivatives | Foreign exchange contracts | Futures and forwards
Derivatives
Derivative notionals	3,583,955	3,484,193
Trading derivatives | Foreign exchange contracts | Written options
Derivatives
Derivative notionals	1,235,021	781,698
Trading derivatives | Foreign exchange contracts | Purchased options
Derivatives
Derivative notionals	1,224,655	778,438
Trading derivatives | Equity contracts
Derivatives
Derivative notionals	819,489	713,689
Trading derivatives | Equity contracts | Swaps
Derivatives
Derivative notionals	102,413	96,039
Trading derivatives | Equity contracts | Futures and forwards
Derivatives
Derivative notionals	22,955	16,171
Trading derivatives | Equity contracts | Written options
Derivatives
Derivative notionals	355,941	320,243
Trading derivatives | Equity contracts | Purchased options
Derivatives
Derivative notionals	338,180	281,236
Trading derivatives | Commodity and other contracts
Derivatives
Derivative notionals	314,673	278,922
Trading derivatives | Commodity and other contracts | Swaps
Derivatives
Derivative notionals	27,966	27,323
Trading derivatives | Commodity and other contracts | Futures and forwards
Derivatives
Derivative notionals	89,526	75,897
Trading derivatives | Commodity and other contracts | Written options
Derivatives
Derivative notionals	100,764	86,418
Trading derivatives | Commodity and other contracts | Purchased options
Derivatives
Derivative notionals	96,417	89,284
Trading derivatives | Credit derivatives
Derivatives
Derivative notionals	2,770,291	2,758,688
Trading derivatives | Credit derivatives | Protection sold
Derivatives
Derivative notionals	1,360,847	1,346,494
Trading derivatives | Credit derivatives | Protection purchased
Derivatives
Derivative notionals	1,409,444	1,412,194
Hedging instruments under ASC 815 (SFAS 133)
Derivatives
Derivative notionals	216,018	207,893
Hedging instruments under ASC 815 (SFAS 133) | Interest rate contracts
Derivatives
Derivative notionals	133,418	114,296
Hedging instruments under ASC 815 (SFAS 133) | Interest rate contracts | Swaps
Derivatives
Derivative notionals	133,418	114,296
Hedging instruments under ASC 815 (SFAS 133) | Foreign exchange contracts
Derivatives
Derivative notionals	82,493	93,243
Hedging instruments under ASC 815 (SFAS 133) | Foreign exchange contracts | Swaps
Derivatives
Derivative notionals	21,331	22,207
Hedging instruments under ASC 815 (SFAS 133) | Foreign exchange contracts | Futures and forwards
Derivatives
Derivative notionals	60,414	70,484
Hedging instruments under ASC 815 (SFAS 133) | Foreign exchange contracts | Written options
Derivatives
Derivative notionals	118	96
Hedging instruments under ASC 815 (SFAS 133) | Foreign exchange contracts | Purchased options
Derivatives
Derivative notionals	630	456
Hedging instruments under ASC 815 (SFAS 133) | Credit derivatives
Derivatives
Derivative notionals	107	354
Hedging instruments under ASC 815 (SFAS 133) | Credit derivatives | Protection purchased
Derivatives
Derivative notionals	107	354
Hedging instruments under ASC 815 (SFAS 133) | Net investment hedge
Derivatives
Derivative notionals	5,332	4,888
Management hedges
Derivatives
Derivative notionals	291,926	251,676
Management hedges | Interest rate contracts
Derivatives
Derivative notionals	232,230	176,172
Management hedges | Interest rate contracts | Swaps
Derivatives
Derivative notionals	129,189	99,434
Management hedges | Interest rate contracts | Futures and forwards
Derivatives
Derivative notionals	79,803	45,856
Management hedges | Interest rate contracts | Written options
Derivatives
Derivative notionals	15,521	22,992
Management hedges | Interest rate contracts | Purchased options
Derivatives
Derivative notionals	7,717	7,890
Management hedges | Foreign exchange contracts
Derivatives
Derivative notionals	41,951	53,763
Management hedges | Foreign exchange contracts | Swaps
Derivatives
Derivative notionals	20,080	16,900
Management hedges | Foreign exchange contracts | Futures and forwards
Derivatives
Derivative notionals	21,808	33,768
Management hedges | Foreign exchange contracts | Written options
Derivatives
Derivative notionals		989
Management hedges | Foreign exchange contracts | Purchased options
Derivatives
Derivative notionals	63	2,106
Management hedges | Credit derivatives
Derivatives
Derivative notionals	17,745	21,741
Management hedges | Credit derivatives | Protection purchased
Derivatives
Derivative notionals	$ 17,745	$ 21,741