DERIVATIVES - Credit Derivatives (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($) agency	Dec. 31, 2023 USD ($)
Credit Risk Derivatives
Fair values, receivable	$ 8,792	$ 8,339
Fair values, payable	8,572	8,082
Notionals, protection purchased	588,856	567,627
Notionals, protection sold	513,714	496,699
Fair value of derivative in liability position	13,000	15,000
Fair value of collateral already posted	$ 11,000	12,000
Number of rating agencies | agency	3
Additional collateral to be posted	$ 500
Collateral to be segregated	34
Aggregate cash obligations and collateral requirements	600
Fair value gross derivative assets	285,867	308,431
Purchased
Credit Risk Derivatives
Fair values, receivable	2,735	2,770
Fair values, payable	6,684	6,097
Sold
Credit Risk Derivatives
Fair values, receivable	6,057	5,569
Fair values, payable	1,888	1,985
Within 1 year
Credit Risk Derivatives
Fair values, receivable	842	986
Fair values, payable	1,483	1,713
Notionals, protection purchased	158,332	155,910
Notionals, protection sold	133,402	128,874
From 1 to 5 years
Credit Risk Derivatives
Fair values, receivable	6,288	5,816
Fair values, payable	5,559	4,939
Notionals, protection purchased	355,771	366,156
Notionals, protection sold	324,350	337,583
After 5 years
Credit Risk Derivatives
Fair values, receivable	1,662	1,537
Fair values, payable	1,530	1,430
Notionals, protection purchased	74,753	45,561
Notionals, protection sold	55,962	30,242
Investment grade
Credit Risk Derivatives
Fair values, receivable	4,553	4,282
Fair values, payable	4,012	4,138
Notionals, protection purchased	444,255	444,989
Notionals, protection sold	395,280	393,115
Non-investment grade
Credit Risk Derivatives
Fair values, receivable	4,239	4,057
Fair values, payable	4,560	3,944
Notionals, protection purchased	144,601	122,638
Notionals, protection sold	118,434	103,584
Credit default swaps and options
Credit Risk Derivatives
Fair values, receivable	8,038	7,686
Fair values, payable	7,794	7,243
Notionals, protection purchased	553,605	539,522
Notionals, protection sold	508,143	491,514
Total return swaps and other
Credit Risk Derivatives
Fair values, receivable	754	653
Fair values, payable	778	839
Notionals, protection purchased	35,251	28,105
Notionals, protection sold	5,571	5,185
Interest rate swaps
Credit Risk Derivatives
Cash proceeds received for assets derecognized	5,100	4,300
Fair value of derecognized assets	4,900	4,300
Fair value gross derivative assets	104	121
Trading derivatives, liability	$ 40	$ 29