BUSINESS AND BASIS OF PRESENTATION - Additional Information (Details) - USD ($)			1 Months Ended	3 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2022	Apr. 01, 2022	Dec. 31, 2022	Sep. 30, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Goodwill	$ 93,000,000		$ 93,000,000			$ 93,000,000	$ 0	$ 93,000,000
Reinsurance recoverables, decrease								94,000,000
Net modified coinsurance receivable, increase								63,000,000
Deposit asset, decrease								19,000,000
Insurance liabilities, decrease								50,000,000
Goodwill impairment				$ 93,000,000	$ 0	0	$ 93,000,000		$ 0
PAI
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Consideration	1,762,000,000	$ 1,761,000,000	1,762,000,000
Goodwill		93,000,000
Total purchase consideration		1,748,000,000
Cash reimbursement for transaction costs incurred		13,000,000
Bargain gain purchase		$ 5,000,000
Consideration adjustment			1,000,000
Cash transferred adjustment			4,000,000
Cash reimbursement adjustment			3,000,000
Deferred tax asset adjustment	$ 97,000,000		$ 97,000,000			$ 97,000,000		$ 97,000,000