SIGNIFICANT ACCOUNTING POLICIES - Assumption Updates (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Change in Accounting Estimate [Line Items]
Increase (decrease) in remeasurement of liability for future policy benefits	$ (29)	$ 1	$ 17
Increase (decrease) policyholders' benefits	880	300	255
Decreased other operating costs and expenses	(679)	(103)	(102)
Increase (decrease) in income (loss) from continuing operation, before income taxes	1,425	(110)	(109)
Long-term Lapses Partial Withdrawal Rates and Election Assumptions Updates
Change in Accounting Estimate [Line Items]
Increase (decrease) in remeasurement of liability for future policy benefits	12	1	(4)
Increase (decrease) policyholders' benefits	(1)	(11)	14
Increase (decrease) in market risk benefits and purchased mark risk benefits	(8)		1
Decreased other operating costs and expenses	42
Increase (decrease) in income (loss) from continuing operation, before income taxes	39	11	(11)
Increase (decrease) in net income (loss)	$ 31	9	$ (9)
Decrease in amortization of DAC		$ 1