DERIVATIVES ACTIVITIES (Details 2) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Trading account assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	$ 963,153,000,000	$ 1,058,715,000,000
Cash collateral paid, net of amount used to offset derivative liabilities	5,195,000,000	5,597,000,000
Less:Netting agreements to assets	(877,186,000,000)	(970,782,000,000)
Netting cash collateral received	(35,862,000,000)	(38,910,000,000)
Net receivables	55,300,000,000	54,620,000,000
Cash collateral paid	(453,000,000)	(1,021,000,000)
Non-cash collateral paid	(7,531,000,000)	(7,143,000,000)
Total	47,316,000,000	46,456,000,000
Cash collateral paid, gross	54,469,000,000	61,152,000,000
Trading account liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	969,355,000,000	1,070,165,000,000
Cash collateral received, net of amount used to offset derivative assets	9,890,000,000	7,923,000,000
Less:Netting agreements to liabilities	(877,186,000,000)	(970,782,000,000)
Netting cash collateral paid	(49,274,000,000)	(55,555,000,000)
Net payables	52,785,000,000	51,751,000,000
Cash collateral received	(15,000,000)	(10,000,000)
Non-cash collateral received	(7,279,000,000)	(5,641,000,000)
Total	45,491,000,000	46,100,000,000
Cash collateral received, gross	45,752,000,000	46,833,000,000
Other assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	5,018,000,000	6,303,000,000
Cash collateral paid, net of amount used to offset derivative liabilities	339,000,000	214,000,000
Netting cash collateral received	(3,527,000,000)	(4,660,000,000)
Net receivables	1,830,000,000	1,857,000,000
Non-cash collateral paid		(388,000,000)
Total	1,830,000,000	1,469,000,000
Cash collateral paid, gross	339,000,000	214,000,000
Other liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	2,438,000,000	2,252,000,000
Cash collateral received, net of amount used to offset derivative assets	281,000,000	658,000,000
Net payables	2,719,000,000	2,910,000,000
Total	2,719,000,000	2,910,000,000
Cash collateral received, gross	3,808,000,000	5,318,000,000
Protection purchased
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	21,882,000,000	20,832,000,000
Protection sold
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	20,526,000,000	19,710,000,000
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Trading account assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	6,084,000,000	8,136,000,000
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Trading account liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	2,724,000,000	3,613,000,000
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Other assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	4,418,000,000	5,552,000,000
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Other liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	1,849,000,000	1,719,000,000
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Interest rate contracts | Trading account assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	5,566,000,000	7,795,000,000
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Interest rate contracts | Trading account assets | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	3,340,000,000	5,110,000,000
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Interest rate contracts | Trading account assets | Cleared
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	2,226,000,000	2,685,000,000
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Interest rate contracts | Trading account liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	1,531,000,000	2,263,000,000
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Interest rate contracts | Trading account liabilities | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	964,000,000	1,702,000,000
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Interest rate contracts | Trading account liabilities | Cleared
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	567,000,000	561,000,000
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Interest rate contracts | Other assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	3,978,000,000	4,574,000,000
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Interest rate contracts | Other assets | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	3,977,000,000	4,574,000,000
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Interest rate contracts | Other assets | Cleared
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	1,000,000
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Interest rate contracts | Other liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	1,119,000,000	1,178,000,000
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Interest rate contracts | Other liabilities | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	1,117,000,000	1,175,000,000
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Interest rate contracts | Other liabilities | Cleared
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	2,000,000	3,000,000
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Foreign exchange contracts | Trading account assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	518,000,000	341,000,000
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Foreign exchange contracts | Trading account assets | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	518,000,000	341,000,000
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Foreign exchange contracts | Trading account liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	1,193,000,000	1,350,000,000
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Foreign exchange contracts | Trading account liabilities | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	1,193,000,000	1,350,000,000
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Foreign exchange contracts | Other assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	440,000,000	978,000,000
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Foreign exchange contracts | Other assets | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	440,000,000	978,000,000
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Foreign exchange contracts | Other liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	718,000,000	525,000,000
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Foreign exchange contracts | Other liabilities | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	718,000,000	525,000,000
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Credit derivatives | Other liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	12,000,000	16,000,000
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Credit derivatives | Other liabilities | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	12,000,000	16,000,000
Other derivative instruments | Trading account assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	957,069,000,000	1,050,579,000,000
Other derivative instruments | Trading account liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	966,631,000,000	1,066,552,000,000
Other derivative instruments | Other assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	600,000,000	751,000,000
Other derivative instruments | Other liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	589,000,000	533,000,000
Other derivative instruments | Interest rate contracts | Trading account assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	798,283,000,000	891,552,000,000
Other derivative instruments | Interest rate contracts | Trading account assets | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	427,999,000,000	485,100,000,000
Other derivative instruments | Interest rate contracts | Trading account assets | Cleared
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	370,239,000,000	406,384,000,000
Other derivative instruments | Interest rate contracts | Trading account assets | Exchange Traded
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	45,000,000	68,000,000
Other derivative instruments | Interest rate contracts | Trading account liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	794,257,000,000	889,629,000,000
Other derivative instruments | Interest rate contracts | Trading account liabilities | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	417,684,000,000	473,446,000,000
Other derivative instruments | Interest rate contracts | Trading account liabilities | Cleared
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	376,498,000,000	416,127,000,000
Other derivative instruments | Interest rate contracts | Trading account liabilities | Exchange Traded
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	75,000,000	56,000,000
Other derivative instruments | Interest rate contracts | Other assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	316,000,000	449,000,000
Other derivative instruments | Interest rate contracts | Other assets | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	291,000,000	438,000,000
Other derivative instruments | Interest rate contracts | Other assets | Cleared
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	25,000,000	11,000,000
Other derivative instruments | Interest rate contracts | Other liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	54,000,000	29,000,000
Other derivative instruments | Interest rate contracts | Other liabilities | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	2,000,000	4,000,000
Other derivative instruments | Interest rate contracts | Other liabilities | Cleared
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	52,000,000	25,000,000
Other derivative instruments | Foreign exchange contracts | Trading account assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	77,305,000,000	75,937,000,000
Other derivative instruments | Foreign exchange contracts | Trading account assets | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	77,297,000,000	75,933,000,000
Other derivative instruments | Foreign exchange contracts | Trading account assets | Cleared
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	8,000,000	4,000,000
Other derivative instruments | Foreign exchange contracts | Trading account liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	78,640,000,000	80,699,000,000
Other derivative instruments | Foreign exchange contracts | Trading account liabilities | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	78,631,000,000	80,695,000,000
Other derivative instruments | Foreign exchange contracts | Trading account liabilities | Cleared
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	9,000,000	4,000,000
Other derivative instruments | Foreign exchange contracts | Other assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	158,000,000	200,000,000
Other derivative instruments | Foreign exchange contracts | Other assets | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	158,000,000	200,000,000
Other derivative instruments | Foreign exchange contracts | Other liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	137,000,000	112,000,000
Other derivative instruments | Foreign exchange contracts | Other liabilities | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	137,000,000	112,000,000
Other derivative instruments | Equity contracts | Trading account assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	19,672,000,000	18,209,000,000
Other derivative instruments | Equity contracts | Trading account assets | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	15,558,000,000	14,273,000,000
Other derivative instruments | Equity contracts | Trading account assets | Cleared
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	184,000,000	53,000,000
Other derivative instruments | Equity contracts | Trading account assets | Exchange Traded
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	3,930,000,000	3,883,000,000
Other derivative instruments | Equity contracts | Trading account liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	32,601,000,000	31,839,000,000
Other derivative instruments | Equity contracts | Trading account liabilities | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	28,653,000,000	28,138,000,000
Other derivative instruments | Equity contracts | Trading account liabilities | Cleared
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	161,000,000	91,000,000
Other derivative instruments | Equity contracts | Trading account liabilities | Exchange Traded
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	3,787,000,000	3,610,000,000
Other derivative instruments | Commodity and other contracts | Trading account assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	10,711,000,000	10,857,000,000
Other derivative instruments | Commodity and other contracts | Trading account assets | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	9,072,000,000	8,889,000,000
Other derivative instruments | Commodity and other contracts | Trading account assets | Exchange Traded
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	1,639,000,000	1,968,000,000
Other derivative instruments | Commodity and other contracts | Trading account liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	11,423,000,000	12,131,000,000
Other derivative instruments | Commodity and other contracts | Trading account liabilities | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	9,884,000,000	10,154,000,000
Other derivative instruments | Commodity and other contracts | Trading account liabilities | Exchange Traded
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	1,539,000,000	1,977,000,000
Other derivative instruments | Credit derivatives | Trading account assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	51,098,000,000	54,024,000,000
Other derivative instruments | Credit derivatives | Trading account assets | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	49,594,000,000	52,809,000,000
Other derivative instruments | Credit derivatives | Trading account assets | Cleared
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	1,504,000,000	1,215,000,000
Other derivative instruments | Credit derivatives | Trading account liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	49,710,000,000	52,254,000,000
Other derivative instruments | Credit derivatives | Trading account liabilities | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	48,284,000,000	51,175,000,000
Other derivative instruments | Credit derivatives | Trading account liabilities | Cleared
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	1,426,000,000	1,079,000,000
Other derivative instruments | Credit derivatives | Other assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	126,000,000	102,000,000
Other derivative instruments | Credit derivatives | Other assets | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	126,000,000	102,000,000
Other derivative instruments | Credit derivatives | Other liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	398,000,000	392,000,000
Other derivative instruments | Credit derivatives | Other liabilities | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	398,000,000	392,000,000
Other derivative instruments | Credit derivatives | Protection purchased | Trading account assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	30,572,000,000	34,314,000,000
Other derivative instruments | Credit derivatives | Protection purchased | Trading account liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	21,472,000,000	20,424,000,000
Other derivative instruments | Credit derivatives | Protection sold | Trading account assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	20,526,000,000	19,710,000,000
Other derivative instruments | Credit derivatives | Protection sold | Trading account liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	$ 28,238,000,000	$ 31,830,000,000