SIGNIFICANT ACCOUNTING POLICIES - Assumption Updates and Model Changes (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2022	Sep. 30, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Change in Accounting Estimate [Line Items]
Policy charges and fee income			$ 299	$ 275	$ 261
Policyholders’ benefits			300	239	184
Amortization of deferred policy acquisition costs, net			48	25	31
Income (loss) from operations, before income taxes			(46)	(27)	(39)
Net income (loss)			(38)	(20)	(10)
Adjustment
Change in Accounting Estimate [Line Items]
Income (loss) from operations, before income taxes	$ (7)
Assumptions Updates
Change in Accounting Estimate [Line Items]
Policy charges and fee income			(7)	2	9
Policyholders’ benefits			10	(10)	1
Amortization of deferred policy acquisition costs, net			14	(4)	8
Income (loss) from operations, before income taxes			17	(12)	(16)
Net income (loss)			$ 13	$ (9)	$ (13)
Model Changes
Change in Accounting Estimate [Line Items]
Income (loss) from operations, before income taxes		$ 21
Net income (loss)		$ 17