INVESTMENTS - Summary of Components of Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Debt Securities, Available-for-Sale [Line Items]
Gross investment income before adjustments	$ 416	$ 167	$ 1,056	$ 661
Funds held interest income (expense)	5	0	7	4
Future policy benefit reserve income (expense)	0	0	(1)	0
Gross investment income	420	167	1,063	665
Investment expenses	14	15	41	45
Net investment income	406	151	1,023	620
Fixed maturities
Debt Securities, Available-for-Sale [Line Items]
Gross investment income before adjustments	299	186	822	503
Equity securities
Debt Securities, Available-for-Sale [Line Items]
Gross investment income before adjustments	1	6	3	15
Short-term investments gain (loss)
Debt Securities, Available-for-Sale [Line Items]
Gross investment income before adjustments	41	5	92	12
Limited partnerships
Debt Securities, Available-for-Sale [Line Items]
Gross investment income before adjustments	60	(42)	98	94
Other
Debt Securities, Available-for-Sale [Line Items]
Gross investment income before adjustments	$ 15	$ 11	$ 42	$ 37

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