DERIVATIVES - Credit Derivatives (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) counterparty agency	Dec. 31, 2022 USD ($)
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 values, Receivable	$ 8,339.0	$ 8,389.0
Fair values, Payable	8,082.0	7,777.0
Notionals, Protection purchased	567,627.0	641,639.0
Notionals, Protection sold	496,699.0	593,136.0
Fair value of derivative in liability position	15,000.0	18,000.0
Fair value of collateral already posted	$ 12,000.0	15,000.0
Number of rating agencies | agency	3
Additional collateral to be posted	$ 500.0
Collateral to be segregated	33.0
Aggregate cash obligations and collateral requirements	500.0
Fair value gross derivative assets	308,431.0	346,545.0
Purchased
Credit Derivative
Fair values, Receivable	2,770.0	5,094.0
Fair values, Payable	6,097.0	3,573.0
Sold
Credit Derivative
Fair values, Receivable	5,569.0	3,295.0
Fair values, Payable	1,985.0	4,204.0
Within 1 year
Credit Derivative
Fair values, Receivable	986.0	1,753.0
Fair values, Payable	1,713.0	1,801.0
Notionals, Protection purchased	155,910.0	147,031.0
Notionals, Protection sold	128,874.0	148,721.0
From 1 to 5 years
Credit Derivative
Fair values, Receivable	5,816.0	4,577.0
Fair values, Payable	4,939.0	4,134.0
Notionals, Protection purchased	366,156.0	443,113.0
Notionals, Protection sold	337,583.0	407,293.0
After 5 years
Credit Derivative
Fair values, Receivable	1,537.0	2,059.0
Fair values, Payable	1,430.0	1,842.0
Notionals, Protection purchased	45,561.0	51,495.0
Notionals, Protection sold	30,242.0	37,122.0
Investment Grade
Credit Derivative
Fair values, Receivable	4,282.0	3,796.0
Fair values, Payable	4,138.0	2,970.0
Notionals, Protection purchased	444,989.0	499,339.0
Notionals, Protection sold	393,115.0	462,873.0
Non-Investment Grade
Credit Derivative
Fair values, Receivable	4,057.0	4,593.0
Fair values, Payable	3,944.0	4,807.0
Notionals, Protection purchased	122,638.0	142,300.0
Notionals, Protection sold	103,584.0	130,263.0
Credit default swaps and options
Credit Derivative
Fair values, Receivable	7,686.0	6,867.0
Fair values, Payable	7,243.0	7,360.0
Notionals, Protection purchased	539,522.0	623,981.0
Notionals, Protection sold	491,514.0	586,504.0
Total return swaps and other
Credit Derivative
Fair values, Receivable	653.0	1,522.0
Fair values, Payable	839.0	417.0
Notionals, Protection purchased	28,105.0	17,658.0
Notionals, Protection sold	5,185.0	6,632.0
Interest rate swaps
Credit Derivative
Amount derecognized	4,300.0	1,400.0
Cash proceeds received for assets derecognized	4,300.0	1,400.0
Fair value of derecognized assets	4,300.0	1,400.0
Fair value gross derivative assets	121.0	27.0
Trading derivatives, liability	$ 29.0	$ 32.0