FAIR VALUE OF ASSETS AND LIABILITIES - Changes in Fair Value of Insurance Contracts (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Insurance Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of insurance contracts, liabilities	$ (617)	$ (543)
Insurance Liabilities | Retained Business
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of insurance contracts, liabilities	(602)	(106)
Insurance Liabilities | Ceded Business
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of insurance contracts, liabilities	(15)	(437)
Reinsurance recoverables
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of insurance contracts, assets	(55)	(29)
Reinsurance recoverables | Retained Business
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of insurance contracts, assets	0	0
Reinsurance recoverables | Ceded Business
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of insurance contracts, assets	(55)	(29)
Modified coinsurance receivable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of insurance contracts, assets	73	(238)
Modified coinsurance receivable | Retained Business
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of insurance contracts, assets	0	0
Modified coinsurance receivable | Ceded Business
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of insurance contracts, assets	73	(238)
Deposit asset
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of insurance contracts, assets	(34)	(169)
Deposit asset | Retained Business
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of insurance contracts, assets	0	0
Deposit asset | Ceded Business
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of insurance contracts, assets	$ (34)	$ (169)