INVESTMENTS - Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Net Investment Income [Line Items]
Gross investment income (loss)	$ 165	$ 30
Investment expenses	(4)	(1)
Net investment income (loss)	161	29
Fixed maturities
Net Investment Income [Line Items]
Gross investment income (loss)	143	29
Mortgage loans on real estate
Net Investment Income [Line Items]
Gross investment income (loss)	7	0
Policy loans
Net Investment Income [Line Items]
Gross investment income (loss)	1	1
Other equity investments
Net Investment Income [Line Items]
Gross investment income (loss)	1	(1)
Trading securities
Net Investment Income [Line Items]
Gross investment income (loss)	0	(2)
Other investment income
Net Investment Income [Line Items]
Gross investment income (loss)	$ 13	$ 3