DERIVATIVES ACTIVITIES - Credit Derivatives (Details) $ in Millions	9 Months Ended
	Sep. 30, 2016 USD ($) agency	Dec. 31, 2015 USD ($)
Credit Risk Derivatives
Fair values, Receivable	$ 30,071	$ 35,717
Fair Values, Payable	31,229	34,731
Notionals, Protection purchased	1,078,946	1,005,214
Notionals, Protection sold	1,021,118	950,922
Fair value of derivative in liability position	27,000	22,000
Fair value of collateral already posted	$ 24,000	19,000
Number of rating agencies | agency	3
Additional collateral to be posted	$ 1,700
Collateral to be segregated	100
Aggregate cash obligations and collateral requirements	1,800
Purchased
Credit Risk Derivatives
Fair values, Receivable	11,567	18,799
Fair Values, Payable	20,248	17,531
Sold
Credit Risk Derivatives
Fair values, Receivable	18,504	16,918
Fair Values, Payable	10,981	17,200
Within 1 year
Credit Risk Derivatives
Fair values, Receivable	4,759	3,871
Fair Values, Payable	5,642	3,559
Notionals, Protection purchased	314,629	265,632
Notionals, Protection sold	301,906	254,225
From 1 to 5 years
Credit Risk Derivatives
Fair values, Receivable	21,143	27,991
Fair Values, Payable	21,382	27,488
Notionals, Protection purchased	661,648	669,834
Notionals, Protection sold	626,205	639,460
After 5 years
Credit Risk Derivatives
Fair values, Receivable	4,169	3,855
Fair Values, Payable	4,205	3,684
Notionals, Protection purchased	102,669	69,748
Notionals, Protection sold	93,007	57,237
Investment grade
Credit Risk Derivatives
Fair values, Receivable	10,860	12,694
Fair Values, Payable	10,914	13,142
Notionals, Protection purchased	809,822	764,040
Notionals, Protection sold	767,629	720,521
Non-investment grade
Credit Risk Derivatives
Fair values, Receivable	19,211	23,023
Fair Values, Payable	20,315	21,589
Notionals, Protection purchased	269,124	241,174
Notionals, Protection sold	253,489	230,401
Credit default swaps and options
Credit Risk Derivatives
Fair values, Receivable	28,457	34,849
Fair Values, Payable	28,652	34,158
Notionals, Protection purchased	1,049,969	981,999
Notionals, Protection sold	1,006,236	940,650
Total return swaps and other
Credit Risk Derivatives
Fair values, Receivable	1,614	868
Fair Values, Payable	2,577	573
Notionals, Protection purchased	28,977	23,215
Notionals, Protection sold	14,882	10,272
Banks
Credit Risk Derivatives
Fair values, Receivable	14,728	18,377
Fair Values, Payable	13,202	16,988
Notionals, Protection purchased	501,904	513,335
Notionals, Protection sold	515,590	508,459
Broker-dealers
Credit Risk Derivatives
Fair values, Receivable	4,240	5,895
Fair Values, Payable	4,822	6,697
Notionals, Protection purchased	132,959	155,195
Notionals, Protection sold	134,774	152,604
Non-financial
Credit Risk Derivatives
Fair values, Receivable	89	128
Fair Values, Payable	104	123
Notionals, Protection purchased	3,497	3,969
Notionals, Protection sold	1,279	2,087
Insurance and other financial institutions
Credit Risk Derivatives
Fair values, Receivable	11,014	11,317
Fair Values, Payable	13,101	10,923
Notionals, Protection purchased	440,586	332,715
Notionals, Protection sold	369,475	$ 287,772
Interest rate swaps
Credit Risk Derivatives
Cash proceeds received for assets derecognized	1,500
Amount derecognized	1,500
Fair value of derecognized assets	1,500
Fair value gross derivative assets	13
Trading derivatives, liability	$ 6