DERIVATIVES ACTIVITIES - Credit Derivatives (Details) $ in Millions	9 Months Ended
	Sep. 30, 2015 USD ($) counterparty agency	Dec. 31, 2014 USD ($)
Credit Derivative
Percentage of receivables from counterparties with collateral agreements	98.00%	98.00%
Number of top counterparties which are banks, financial institutions, and other dealers | counterparty	15
Fair value, Receivable	$ 38,334	$ 43,796
Fair Value, Payable	37,319	43,985
Notionals, Protection Purchased	1,222,547	1,116,387
Notionals, Protection Sold	1,175,657	1,063,858
Fair value of derivative in liability position	25,000	30,000
Fair value of collateral already posted	$ 22,000	27,000
Number of rating agencies | agency	3
Additional collateral to be posted	$ 2,100
Collateral to be segregated	100
Aggregate cash obligations and collateral requirements	2,200
Purchased
Credit Derivative
Fair value, Receivable	18,911	18,708
Fair Value, Payable	19,955	26,527
Sold
Credit Derivative
Fair value, Receivable	19,423	25,088
Fair Value, Payable	17,364	17,458
Within 1 year
Credit Derivative
Fair value, Receivable	2,688	4,356
Fair Value, Payable	2,124	4,278
Notionals, Protection Purchased	246,395	250,489
Notionals, Protection Sold	239,578	229,502
From 1 to 5 years
Credit Derivative
Fair value, Receivable	30,243	34,692
Fair Value, Payable	29,810	35,160
Notionals, Protection Purchased	842,684	790,251
Notionals, Protection Sold	808,865	772,001
After 5 years
Credit Derivative
Fair value, Receivable	5,403	4,748
Fair Value, Payable	5,385	4,547
Notionals, Protection Purchased	133,468	75,647
Notionals, Protection Sold	127,214	62,355
Investment Grade
Credit Derivative
Fair value, Receivable	15,679	17,432
Fair Value, Payable	15,297	17,182
Notionals, Protection Purchased	926,912	824,831
Notionals, Protection Sold	888,780	786,848
Non-Investment Grade
Credit Derivative
Fair value, Receivable	22,655	26,364
Fair Value, Payable	22,022	26,803
Notionals, Protection Purchased	295,635	291,556
Notionals, Protection Sold	286,877	277,010
Credit default swaps and options
Credit Derivative
Fair value, Receivable	37,842	42,930
Fair Value, Payable	36,782	42,201
Notionals, Protection Purchased	1,203,305	1,094,199
Notionals, Protection Sold	1,168,598	1,054,671
Total return swaps and other
Credit Derivative
Fair value, Receivable	492	866
Fair Value, Payable	537	1,784
Notionals, Protection Purchased	19,242	22,188
Notionals, Protection Sold	7,059	9,187
Bank
Credit Derivative
Fair value, Receivable	19,377	24,828
Fair Value, Payable	17,499	23,189
Notionals, Protection Purchased	579,175	574,764
Notionals, Protection Sold	574,608	604,700
Broker-dealer
Credit Derivative
Fair value, Receivable	6,382	8,093
Fair Value, Payable	6,690	9,309
Notionals, Protection Purchased	174,590	204,542
Notionals, Protection Sold	171,430	199,693
Non-financial
Credit Derivative
Fair value, Receivable	125	91
Fair Value, Payable	155	113
Notionals, Protection Purchased	4,311	3,697
Notionals, Protection Sold	2,213	1,595
Insurance and other financial institutions
Credit Derivative
Fair value, Receivable	12,450	10,784
Fair Value, Payable	12,975	11,374
Notionals, Protection Purchased	464,471	333,384
Notionals, Protection Sold	427,406	$ 257,870
Interest rate swaps
Credit Derivative
Amount derecognized	2,100
Cash proceeds received for assets derecognized	2,100
Fair value of derecognized assets	2,000
Fair value gross derivative assets	6
Trading derivatives, liability	$ 94