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INVESTMENTS - Summary of Components of Net Realized Capital Gains (Losses) (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]
Total net gains (losses) on investments	$ (31)	$ (129)	$ (21)	$ (519)
Fixed maturities | Market Value
Debt Securities, Available-for-Sale [Line Items]
Allowance for credit losses	2	(5)	(6)	(18)
Net gains (losses on investments	(16)	(136)	(3)	(462)
Equity securities | Fair Value
Debt Securities, Available-for-Sale [Line Items]
Net gains (losses on investments	(19)	(53)	(21)	(66)
Gains (losses) from fair value adjustments	1	58	8	15
Other invested assets
Debt Securities, Available-for-Sale [Line Items]
Net gains (losses on investments	0	6	0	11
Short-term investments gain (loss)
Debt Securities, Available-for-Sale [Line Items]
Net gains (losses on investments	$ 0	$ 1	$ 0	$ 1

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