DERIVATIVES - Credit Derivatives (Details) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($) agency	Dec. 31, 2021 USD ($)
Credit Risk Derivatives
Fair values, receivable	$ 11,243	$ 10,218
Fair values, payable	11,146	11,015
Notionals, protection purchased	770,692	645,996
Notionals, protection sold	714,636	572,486
Fair value of derivative in liability position	19,000	19,000
Fair value of collateral already posted	$ 16,000	16,000
Number of rating agencies | agency	3
Additional collateral to be posted	$ 1,600
Collateral to be segregated	100
Aggregate cash obligations and collateral requirements	1,700
Purchased
Credit Risk Derivatives
Fair values, receivable	5,310	3,705
Fair values, payable	6,250	7,354
Sold
Credit Risk Derivatives
Fair values, receivable	5,933	6,513
Fair values, payable	4,896	3,661
Within 1 year
Credit Risk Derivatives
Fair values, receivable	1,329	878
Fair values, payable	1,547	1,462
Notionals, protection purchased	166,987	133,866
Notionals, protection sold	158,945	115,603
From 1 to 5 years
Credit Risk Derivatives
Fair values, receivable	7,110	6,674
Fair values, payable	6,951	6,638
Notionals, protection purchased	496,438	454,617
Notionals, protection sold	454,804	413,174
After 5 years
Credit Risk Derivatives
Fair values, receivable	2,804	2,666
Fair values, payable	2,648	2,915
Notionals, protection purchased	107,267	57,513
Notionals, protection sold	100,887	43,709
Investment grade
Credit Risk Derivatives
Fair values, receivable	4,244	4,149
Fair values, payable	3,846	4,258
Notionals, protection purchased	612,115	511,652
Notionals, protection sold	559,959	448,944
Non-investment grade
Credit Risk Derivatives
Fair values, receivable	6,999	6,069
Fair values, payable	7,300	6,757
Notionals, protection purchased	158,577	134,344
Notionals, protection sold	154,677	123,542
Credit default swaps and options
Credit Risk Derivatives
Fair values, receivable	10,415	9,923
Fair values, payable	10,719	10,234
Notionals, protection purchased	756,803	628,136
Notionals, protection sold	708,569	565,131
Total return swaps and other
Credit Risk Derivatives
Fair values, receivable	828	295
Fair values, payable	427	781
Notionals, protection purchased	13,889	17,860
Notionals, protection sold	6,067	7,355
Banks
Credit Risk Derivatives
Fair values, receivable	2,768	2,375
Fair values, payable	3,253	3,031
Notionals, protection purchased	120,240	108,415
Notionals, protection sold	116,278	103,756
Broker-dealers
Credit Risk Derivatives
Fair values, receivable	2,396	1,962
Fair values, payable	1,474	1,139
Notionals, protection purchased	48,553	44,364
Notionals, protection sold	43,749	40,068
Non-financial
Credit Risk Derivatives
Fair values, receivable	101	113
Fair values, payable	17	306
Notionals, protection purchased	2,578	2,785
Notionals, protection sold	2,374	2,728
Insurance and other financial institutions
Credit Risk Derivatives
Fair values, receivable	5,978	5,768
Fair values, payable	6,402	6,539
Notionals, protection purchased	599,321	490,432
Notionals, protection sold	552,235	425,934
Interest rate swaps
Credit Risk Derivatives
Cash proceeds received for assets derecognized	800	2,900
Fair value of derecognized assets	800	2,900
Fair value gross derivative assets	30	13
Trading derivatives, liability	$ 5	$ 58