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INVESTMENTS - Summary of Components of Net Realized Capital Gains (Losses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Debt Securities, Available-for-Sale [Line Items]
Net realized gains (losses) from dispositions	$ 8	$ (5)
Gains (losses) from fair value adjustments	4	(137)
Total net gains (losses) on investments	5	(154)
Fixed maturities | Market Value
Debt Securities, Available-for-Sale [Line Items]
Allowance for credit losses	(8)	(12)
Net realized gains (losses) from dispositions	2	3
Equity securities | Fair Value
Debt Securities, Available-for-Sale [Line Items]
Net realized gains (losses) from dispositions	7	(12)
Gains (losses) from fair value adjustments	4	(137)
Other invested assets
Debt Securities, Available-for-Sale [Line Items]
Net realized gains (losses) from dispositions	$ 0	$ 4

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