INVESTMENTS - Schedule of Components of Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Debt Securities, Available-for-Sale [Line Items]
Gross investment income before adjustments	$ 465	$ 272
Funds held interest income (expense)	6	0
Future policy benefit reserve income (expense)	0	0
Gross investment income	470	272
Investment expenses	13	12
Net investment income	457	260
Fixed maturities
Debt Securities, Available-for-Sale [Line Items]
Gross investment income before adjustments	352	247
Equity securities
Debt Securities, Available-for-Sale [Line Items]
Gross investment income before adjustments	1	1
Short-term investments gain (loss)
Debt Securities, Available-for-Sale [Line Items]
Gross investment income before adjustments	38	17
Limited partnerships
Debt Securities, Available-for-Sale [Line Items]
Gross investment income before adjustments	54	(15)
Other
Debt Securities, Available-for-Sale [Line Items]
Gross investment income before adjustments	$ 20	$ 22

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