INVESTMENTS - Investment Gains (Losses), Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net Investment Income [Line Items]
Investment gains (losses), net	$ (7)	$ (8)	$ 4
Fixed maturities
Net Investment Income [Line Items]
Investment gains (losses), net	(5)	(8)	4
Mortgage loans on real estate
Net Investment Income [Line Items]
Investment gains (losses), net	$ (2)	$ 0	$ 0