UNPAID CLAIM AND CLAIM EXPENSES - Net Liability (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Liability for Claims and Claims Adjustment Expense [Line Items]
Undiscounted LTD Incurred Claims, net of reinsurance	$ 222	$ 184	$ 150
Subtract Cumulative LTD Paid Claims, net of reinsurance	(203)	(165)	(120)
Liability for unpaid claim and claim expense, net of reinsurance	93	74	55	$ 25
Reinsurance Recoverable on unpaid claims	48	36	23	15
Total liability for unpaid claim and claim expense	141	110	$ 78	$ 40
Long-Term Disability
Liability for Claims and Claims Adjustment Expense [Line Items]
Undiscounted LTD Incurred Claims, net of reinsurance	82	57
Subtract Cumulative LTD Paid Claims, net of reinsurance	(33)	(21)
Subtract Impact of LTD Discounting, net of reinsurance	(6)	(4)
Liability for unpaid claim and claim expense, net of reinsurance	43	32
Reinsurance Recoverable on unpaid claims	43	33
Other short-duration contracts
Liability for Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claim and claim expense, net of reinsurance	50	42
Reinsurance Recoverable on unpaid claims	$ 5	$ 3