DERIVATIVES ACTIVITIES (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Net investment hedge under ASC 815
Derivatives
Derivative notionals	$ 5,593	$ 6,450
Hedging instruments under ASC 815
Derivatives
Derivative notionals	241,965	253,193
Hedging instruments under ASC 815 | Interest rate contracts
Derivatives
Derivative notionals	143,643	132,843
Hedging instruments under ASC 815 | Interest rate contracts | Swaps
Derivatives
Derivative notionals	143,623	132,823
Hedging instruments under ASC 815 | Interest rate contracts | Futures and forwards
Derivatives
Derivative notionals	20	20
Hedging instruments under ASC 815 | Foreign exchange contracts
Derivatives
Derivative notionals	98,322	102,255
Hedging instruments under ASC 815 | Foreign exchange contracts | Swaps
Derivatives
Derivative notionals	19,183	22,402
Hedging instruments under ASC 815 | Foreign exchange contracts | Futures and forwards
Derivatives
Derivative notionals	79,139	79,646
Hedging instruments under ASC 815 | Foreign exchange contract options | Written or Sold
Derivatives
Derivative notionals		101
Hedging instruments under ASC 815 | Foreign exchange contract options | Purchased
Derivatives
Derivative notionals		106
Hedging instruments under ASC 815 | Credit derivatives
Derivatives
Derivative notionals		95
Hedging instruments under ASC 815 | Credit derivatives | Purchased
Derivatives
Derivative notionals		95
Other derivative instruments, Management hedges
Derivatives
Derivative notionals	228,134	215,026
Other derivative instruments, Management hedges | Interest rate contracts
Derivatives
Derivative notionals	178,364	160,972
Other derivative instruments, Management hedges | Interest rate contracts | Swaps
Derivatives
Derivative notionals	101,333	93,286
Other derivative instruments, Management hedges | Interest rate contracts | Futures and forwards
Derivatives
Derivative notionals	67,133	61,398
Other derivative instruments, Management hedges | Interest rate contract options | Written or Sold
Derivatives
Derivative notionals	4,063	3,103
Other derivative instruments, Management hedges | Interest rate contract options | Purchased
Derivatives
Derivative notionals	5,835	3,185
Other derivative instruments, Management hedges | Foreign exchange contracts
Derivatives
Derivative notionals	33,811	34,310
Other derivative instruments, Management hedges | Foreign exchange contracts | Swaps
Derivatives
Derivative notionals	20,915	20,013
Other derivative instruments, Management hedges | Foreign exchange contracts | Futures and forwards
Derivatives
Derivative notionals	12,815	14,226
Other derivative instruments, Management hedges | Foreign exchange contract options | Purchased
Derivatives
Derivative notionals	81	71
Other derivative instruments, Management hedges | Credit derivatives
Derivatives
Derivative notionals	15,959	19,744
Other derivative instruments, Management hedges | Credit derivatives | Purchased
Derivatives
Derivative notionals	15,959	19,744
Other derivative instruments, Trading derivatives
Derivatives
Derivative notionals	57,363,934	61,365,141
Other derivative instruments, Trading derivatives | Interest rate contracts
Derivatives
Derivative notionals	45,878,930	50,577,267
Other derivative instruments, Trading derivatives | Interest rate contracts | Swaps
Derivatives
Derivative notionals	31,006,666	36,370,196
Other derivative instruments, Trading derivatives | Interest rate contracts | Futures and forwards
Derivatives
Derivative notionals	6,554,836	6,129,742
Other derivative instruments, Trading derivatives | Interest rate contract options | Written or Sold
Derivatives
Derivative notionals	4,230,271	4,105,632
Other derivative instruments, Trading derivatives | Interest rate contract options | Purchased
Derivatives
Derivative notionals	4,087,157	3,971,697
Other derivative instruments, Trading derivatives | Foreign exchange contracts
Derivatives
Derivative notionals	7,981,813	7,348,108
Other derivative instruments, Trading derivatives | Foreign exchange contracts | Swaps
Derivatives
Derivative notionals	1,619,148	1,552,292
Other derivative instruments, Trading derivatives | Foreign exchange contracts | Futures and forwards
Derivatives
Derivative notionals	3,737,366	3,728,511
Other derivative instruments, Trading derivatives | Foreign exchange contract options | Written or Sold
Derivatives
Derivative notionals	1,285,775	1,037,433
Other derivative instruments, Trading derivatives | Foreign exchange contract options | Purchased
Derivatives
Derivative notionals	1,339,524	1,029,872
Other derivative instruments, Trading derivatives | Equity contracts
Derivatives
Derivative notionals	793,919	723,695
Other derivative instruments, Trading derivatives | Equity contracts | Swaps
Derivatives
Derivative notionals	114,554	100,019
Other derivative instruments, Trading derivatives | Equity contracts | Futures and forwards
Derivatives
Derivative notionals	30,936	23,161
Other derivative instruments, Trading derivatives | Equity contract options | Written or Sold
Derivatives
Derivative notionals	338,817	333,945
Other derivative instruments, Trading derivatives | Equity contract options | Purchased
Derivatives
Derivative notionals	309,612	266,570
Other derivative instruments, Trading derivatives | Commodity and other contracts
Derivatives
Derivative notionals	390,491	377,485
Other derivative instruments, Trading derivatives | Commodity and other contracts | Swaps
Derivatives
Derivative notionals	60,078	81,112
Other derivative instruments, Trading derivatives | Commodity and other contracts | Futures and forwards
Derivatives
Derivative notionals	107,865	98,265
Other derivative instruments, Trading derivatives | Commodity and other contract options | Written or Sold
Derivatives
Derivative notionals	109,633	100,482
Other derivative instruments, Trading derivatives | Commodity and other contract options | Purchased
Derivatives
Derivative notionals	112,915	97,626
Other derivative instruments, Trading derivatives | Credit derivatives
Derivatives
Derivative notionals	2,318,781	2,338,586
Other derivative instruments, Trading derivatives | Credit derivatives | Written or Sold
Derivatives
Derivative notionals	1,132,590	1,143,363
Other derivative instruments, Trading derivatives | Credit derivatives | Purchased
Derivatives
Derivative notionals	$ 1,186,191	$ 1,195,223