DERIVATIVES ACTIVITIES - Derivative Mark-to-Market (MTM) Receivables/Payables (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Derivative Mark-to-Market (MTM) Receivables/Payables
Netting of cash collateral received	$ (50,476)	$ (47,625)
Netting of cash collateral paid	(42,435)	(47,769)
Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Cash collateral received, gross	78	138
Trading accounts assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	712,234	886,237
Cash collateral paid, net of amount used to offset derivative liabilities	8,515	6,523
Less: Netting agreements to assets	(609,402)	(777,178)
Netting of cash collateral received	(50,476)	(47,625)
Total trading account derivatives, assets	60,871	67,957
Cash collateral received	(774)	(867)
Non-cash collateral received	(10,335)	(10,043)
Total Net receivables	49,762	57,047
Cash collateral paid, gross	50,950	54,292
Does not meet applicable offsetting guidance, assets	12,000	11,000
Trading accounts assets | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Less: Netting agreements to assets	(440,000)	(510,000)
Less: Netting agreements to liabilities		(510,000)
Trading accounts assets | Cleared
Derivative Mark-to-Market (MTM) Receivables/Payables
Less: Netting agreements to assets	(164,000)	(264,000)
Less: Netting agreements to liabilities		(264,000)
Trading accounts assets | Exchange traded
Derivative Mark-to-Market (MTM) Receivables/Payables
Less: Netting agreements to assets	(5,000)	(3,000)
Less: Netting agreements to liabilities		(3,000)
Trading accounts liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	704,334	883,193
Cash collateral received, net of amount used to offset derivative assets	9,751	9,846
Less: Netting agreements to liabilities	(609,402)	(777,178)
Netting of cash collateral paid	(42,435)	(47,769)
Total derivative liabilities	62,248	68,092
Cash collateral paid	(2)	(11)
Non-cash collateral paid	(5,795)	(6,264)
Total Net payables	56,451	61,817
Cash collateral received, gross	60,227	57,471
Does not meet applicable offsetting guidance, liabilities	11,000	10,000
Trading accounts liabilities | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Less: Netting agreements to liabilities	(440,000)
Netting of cash collateral paid		(46,000)
Trading accounts liabilities | Cleared
Derivative Mark-to-Market (MTM) Receivables/Payables
Less: Netting agreements to liabilities	(164,000)
Netting of cash collateral paid		(2,000)
Trading accounts liabilities | Exchange traded
Derivative Mark-to-Market (MTM) Receivables/Payables
Less: Netting agreements to liabilities	(5,000)
Other assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	3,879	4,326
Cash collateral paid, net of amount used to offset derivative liabilities	0	123
Less: Netting agreements to assets	0	0
Netting of cash collateral received	(1,737)	(1,791)
Total trading account derivatives, assets	2,142	2,658
Cash collateral received	0	0
Non-cash collateral received	(521)	(1,293)
Total Net receivables	1,621	1,365
Other liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	1,930	1,784
Cash collateral received, net of amount used to offset derivative assets	30	7
Less: Netting agreements to liabilities	0	0
Netting of cash collateral received	(78)	(15)
Netting of cash collateral paid	(78)	(15)
Total derivative liabilities	1,882	1,776
Cash collateral paid	0	0
Non-cash collateral paid	0	0
Total Net payables	1,882	1,776
Cash collateral received, gross	1,767	1,798
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Trading accounts assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	8,766	9,693
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Trading accounts liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	2,434	1,815
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Other assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	2,555	3,795
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Other liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	1,073	1,027
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Interest rate contracts | Trading accounts assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	5,649	5,808
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Interest rate contracts | Trading accounts assets | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	4,986	1,508
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Interest rate contracts | Trading accounts assets | Cleared
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	663	4,300
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Interest rate contracts | Trading accounts liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	1,430	1,072
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Interest rate contracts | Trading accounts liabilities | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	265	204
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Interest rate contracts | Trading accounts liabilities | Cleared
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	1,165	868
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Interest rate contracts | Other assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	2,506	3,117
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	2,506	3,117
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Interest rate contracts | Other assets | Cleared
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	0	0
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Interest rate contracts | Other liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	363	439
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	363	414
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Interest rate contracts | Other liabilities | Cleared
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	0	25
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Foreign exchange contracts | Trading accounts assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	3,117	3,885
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Foreign exchange contracts | Trading accounts assets | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	3,117	3,885
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Foreign exchange contracts | Trading accounts liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	1,004	743
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Foreign exchange contracts | Trading accounts liabilities | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	1,004	743
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Foreign exchange contracts | Other assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	49	678
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	49	678
Derivative instruments designated as ASC 815 (SFAS 133) hedges | Foreign exchange contracts | Other liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	710	588
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	710	588
Derivatives not designated in a qualifying hedging relationship | Trading accounts assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	703,468	876,544
Derivatives not designated in a qualifying hedging relationship | Trading accounts liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	701,900	881,378
Derivatives not designated in a qualifying hedging relationship | Other assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	1,324	531
Derivatives not designated in a qualifying hedging relationship | Other liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	857	757
Derivatives not designated in a qualifying hedging relationship | Interest rate contracts | Trading accounts assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	475,661	632,645
Derivatives not designated in a qualifying hedging relationship | Interest rate contracts | Trading accounts assets | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	310,616	376,778
Derivatives not designated in a qualifying hedging relationship | Interest rate contracts | Trading accounts assets | Cleared
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	164,984	255,847
Derivatives not designated in a qualifying hedging relationship | Interest rate contracts | Trading accounts assets | Exchange traded
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	61	20
Derivatives not designated in a qualifying hedging relationship | Interest rate contracts | Trading accounts liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	460,125	621,210
Derivatives not designated in a qualifying hedging relationship | Interest rate contracts | Trading accounts liabilities | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	294,324	359,689
Derivatives not designated in a qualifying hedging relationship | Interest rate contracts | Trading accounts liabilities | Cleared
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	165,753	261,499
Derivatives not designated in a qualifying hedging relationship | Interest rate contracts | Trading accounts liabilities | Exchange traded
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	48	22
Derivatives not designated in a qualifying hedging relationship | Interest rate contracts | Other assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	515	253
Derivatives not designated in a qualifying hedging relationship | Interest rate contracts | Other assets | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	199	106
Derivatives not designated in a qualifying hedging relationship | Interest rate contracts | Other assets | Cleared
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	316	6
Derivatives not designated in a qualifying hedging relationship | Interest rate contracts | Other assets | Exchange traded
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	0	141
Derivatives not designated in a qualifying hedging relationship | Interest rate contracts | Other liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	288	185
Derivatives not designated in a qualifying hedging relationship | Interest rate contracts | Other liabilities | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	0	0
Derivatives not designated in a qualifying hedging relationship | Interest rate contracts | Other liabilities | Cleared
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	288	21
Derivatives not designated in a qualifying hedging relationship | Interest rate contracts | Other liabilities | Exchange traded
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	0	164
Derivatives not designated in a qualifying hedging relationship | Foreign exchange contracts | Trading accounts assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	145,469	152,109
Derivatives not designated in a qualifying hedging relationship | Foreign exchange contracts | Trading accounts assets | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	145,276	151,736
Derivatives not designated in a qualifying hedging relationship | Foreign exchange contracts | Trading accounts assets | Cleared
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	157	366
Derivatives not designated in a qualifying hedging relationship | Foreign exchange contracts | Trading accounts assets | Exchange traded
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	36	7
Derivatives not designated in a qualifying hedging relationship | Foreign exchange contracts | Trading accounts liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	150,871	158,083
Derivatives not designated in a qualifying hedging relationship | Foreign exchange contracts | Trading accounts liabilities | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	150,609	157,650
Derivatives not designated in a qualifying hedging relationship | Foreign exchange contracts | Trading accounts liabilities | Cleared
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	190	387
Derivatives not designated in a qualifying hedging relationship | Foreign exchange contracts | Trading accounts liabilities | Exchange traded
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	72	46
Derivatives not designated in a qualifying hedging relationship | Foreign exchange contracts | Other assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	0	0
Derivatives not designated in a qualifying hedging relationship | Foreign exchange contracts | Other assets | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	0	0
Derivatives not designated in a qualifying hedging relationship | Foreign exchange contracts | Other assets | Cleared
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	0	0
Derivatives not designated in a qualifying hedging relationship | Foreign exchange contracts | Other assets | Exchange traded
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	0	0
Derivatives not designated in a qualifying hedging relationship | Foreign exchange contracts | Other liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	90	17
Derivatives not designated in a qualifying hedging relationship | Foreign exchange contracts | Other liabilities | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	90	17
Derivatives not designated in a qualifying hedging relationship | Foreign exchange contracts | Other liabilities | Cleared
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	0	0
Derivatives not designated in a qualifying hedging relationship | Foreign exchange contracts | Other liabilities | Exchange traded
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	0	0
Derivatives not designated in a qualifying hedging relationship | Equity contracts | Trading accounts assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	27,208	24,752
Derivatives not designated in a qualifying hedging relationship | Equity contracts | Trading accounts assets | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	21,769	20,425
Derivatives not designated in a qualifying hedging relationship | Equity contracts | Trading accounts assets | Cleared
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	13	16
Derivatives not designated in a qualifying hedging relationship | Equity contracts | Trading accounts assets | Exchange traded
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	5,426	4,311
Derivatives not designated in a qualifying hedging relationship | Equity contracts | Trading accounts liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	31,769	32,469
Derivatives not designated in a qualifying hedging relationship | Equity contracts | Trading accounts liabilities | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	26,394	28,333
Derivatives not designated in a qualifying hedging relationship | Equity contracts | Trading accounts liabilities | Cleared
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	14	35
Derivatives not designated in a qualifying hedging relationship | Equity contracts | Trading accounts liabilities | Exchange traded
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	5,361	4,101
Derivatives not designated in a qualifying hedging relationship | Equity contracts | Other assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	0	0
Derivatives not designated in a qualifying hedging relationship | Equity contracts | Other assets | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	0	0
Derivatives not designated in a qualifying hedging relationship | Equity contracts | Other assets | Cleared
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	0	0
Derivatives not designated in a qualifying hedging relationship | Equity contracts | Other assets | Exchange traded
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	0	0
Derivatives not designated in a qualifying hedging relationship | Equity contracts | Other liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	0	0
Derivatives not designated in a qualifying hedging relationship | Equity contracts | Other liabilities | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	0	0
Derivatives not designated in a qualifying hedging relationship | Equity contracts | Other liabilities | Cleared
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	0	0
Derivatives not designated in a qualifying hedging relationship | Equity contracts | Other liabilities | Exchange traded
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	0	0
Derivatives not designated in a qualifying hedging relationship | Commodity and other contract options | Trading accounts assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	17,605	23,520
Derivatives not designated in a qualifying hedging relationship | Commodity and other contract options | Trading accounts assets | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	15,404	19,943
Derivatives not designated in a qualifying hedging relationship | Commodity and other contract options | Trading accounts assets | Exchange traded
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	2,201	3,577
Derivatives not designated in a qualifying hedging relationship | Commodity and other contract options | Trading accounts liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	22,295	26,186
Derivatives not designated in a qualifying hedging relationship | Commodity and other contract options | Trading accounts liabilities | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	18,451	23,103
Derivatives not designated in a qualifying hedging relationship | Commodity and other contract options | Trading accounts liabilities | Exchange traded
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	3,844	3,083
Derivatives not designated in a qualifying hedging relationship | Commodity and other contract options | Other assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	0	0
Derivatives not designated in a qualifying hedging relationship | Commodity and other contract options | Other assets | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	0	0
Derivatives not designated in a qualifying hedging relationship | Commodity and other contract options | Other assets | Exchange traded
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	0	0
Derivatives not designated in a qualifying hedging relationship | Commodity and other contract options | Other liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	0	0
Derivatives not designated in a qualifying hedging relationship | Commodity and other contract options | Other liabilities | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	0	0
Derivatives not designated in a qualifying hedging relationship | Commodity and other contract options | Other liabilities | Exchange traded
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	0	0
Derivatives not designated in a qualifying hedging relationship | Credit derivatives | Trading accounts assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	37,525	43,518
Derivatives not designated in a qualifying hedging relationship | Credit derivatives | Trading accounts assets | Purchased
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	18,102	18,430
Derivative payables		25,972
Derivatives not designated in a qualifying hedging relationship | Credit derivatives | Trading accounts assets | Sold
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	19,423	25,088
Derivative payables		17,458
Derivatives not designated in a qualifying hedging relationship | Credit derivatives | Trading accounts assets | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	32,292	39,412
Derivatives not designated in a qualifying hedging relationship | Credit derivatives | Trading accounts assets | Cleared
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	5,233	4,106
Derivatives not designated in a qualifying hedging relationship | Credit derivatives | Trading accounts liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	36,840	43,430
Derivatives not designated in a qualifying hedging relationship | Credit derivatives | Trading accounts liabilities | Purchased
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	19,476
Derivatives not designated in a qualifying hedging relationship | Credit derivatives | Trading accounts liabilities | Sold
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	17,364
Derivatives not designated in a qualifying hedging relationship | Credit derivatives | Trading accounts liabilities | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	31,510	39,439
Derivatives not designated in a qualifying hedging relationship | Credit derivatives | Trading accounts liabilities | Cleared
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	5,330	3,991
Derivatives not designated in a qualifying hedging relationship | Credit derivatives | Other assets
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	809	278
Derivatives not designated in a qualifying hedging relationship | Credit derivatives | Other assets | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	744	265
Derivatives not designated in a qualifying hedging relationship | Credit derivatives | Other assets | Cleared
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative receivables	65	13
Derivatives not designated in a qualifying hedging relationship | Credit derivatives | Other liabilities
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	479	555
Derivatives not designated in a qualifying hedging relationship | Credit derivatives | Other liabilities | Over-the-counter
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	232	384
Derivatives not designated in a qualifying hedging relationship | Credit derivatives | Other liabilities | Cleared
Derivative Mark-to-Market (MTM) Receivables/Payables
Derivative payables	$ 247	$ 171