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INVESTMENTS - Summary of Components of Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Debt Securities, Available-for-Sale [Line Items]
Gross investment income before adjustments	$ 272	$ 253
Funds held interest income (expense)	0	4
Future policy benefit reserve income (expense)	0	0
Gross investment income	272	256
Investment expenses	(12)	(13)
Net investment income	260	243
Fixed maturities
Debt Securities, Available-for-Sale [Line Items]
Gross investment income before adjustments	247	148
Equity securities
Debt Securities, Available-for-Sale [Line Items]
Gross investment income before adjustments	1	4
Short-term investments gain (loss)
Debt Securities, Available-for-Sale [Line Items]
Gross investment income before adjustments	17	0
Limited partnerships
Debt Securities, Available-for-Sale [Line Items]
Gross investment income before adjustments	(15)	88
Other
Debt Securities, Available-for-Sale [Line Items]
Gross investment income before adjustments	$ 22	$ 12

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