DERIVATIVES - Credit Derivatives (Details) $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($) agency	Dec. 31, 2022 USD ($)
Credit Risk Derivatives
Fair values, receivable	$ 12,642	$ 8,389
Fair values, payable	11,077	7,777
Notionals, protection purchased	828,691	641,639
Notionals, protection sold	765,188	593,136
Fair value of derivative in liability position	15,000	18,000
Fair value of collateral already posted	$ 13,000	15,000
Number of rating agencies | agency	3
Additional collateral to be posted	$ 700
Collateral to be segregated	4
Aggregate cash obligations and collateral requirements	700
Fair value gross derivative assets	333,991	346,545
Purchased
Credit Risk Derivatives
Fair values, receivable	4,697	5,094
Fair values, payable	8,182	3,573
Sold
Credit Risk Derivatives
Fair values, receivable	7,945	3,295
Fair values, payable	2,895	4,204
Within 1 year
Credit Risk Derivatives
Fair values, receivable	1,471	1,753
Fair values, payable	1,035	1,801
Notionals, protection purchased	154,096	147,031
Notionals, protection sold	134,847	148,721
From 1 to 5 years
Credit Risk Derivatives
Fair values, receivable	8,977	4,577
Fair values, payable	8,149	4,134
Notionals, protection purchased	578,360	443,113
Notionals, protection sold	555,290	407,293
After 5 years
Credit Risk Derivatives
Fair values, receivable	2,194	2,059
Fair values, payable	1,893	1,842
Notionals, protection purchased	96,235	51,495
Notionals, protection sold	75,051	37,122
Investment grade
Credit Risk Derivatives
Fair values, receivable	6,809	3,796
Fair values, payable	5,579	2,970
Notionals, protection purchased	656,154	499,339
Notionals, protection sold	611,363	462,873
Non-investment grade
Credit Risk Derivatives
Fair values, receivable	5,833	4,593
Fair values, payable	5,498	4,807
Notionals, protection purchased	172,537	142,300
Notionals, protection sold	153,825	130,263
Credit default swaps and options
Credit Risk Derivatives
Fair values, receivable	11,031	6,867
Fair values, payable	10,644	7,360
Notionals, protection purchased	805,562	623,981
Notionals, protection sold	761,316	586,504
Total return swaps and other
Credit Risk Derivatives
Fair values, receivable	1,611	1,522
Fair values, payable	433	417
Notionals, protection purchased	23,129	17,658
Notionals, protection sold	3,872	6,632
Interest rate swaps
Credit Risk Derivatives
Cash proceeds received for assets derecognized	2,200	1,400
Fair value of derecognized assets	2,200	1,400
Fair value gross derivative assets	3	27
Trading derivatives, liability	$ 52	$ 32