INVESTMENTS - Schedule of Components of Net Gains (Losses) on Investments (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-Sale [Line Items]
Total net gains (losses) on investments	$ (276)	$ (455)	$ 258
Fixed maturity securities
Debt Securities, Available-for-Sale [Line Items]
Allowance for credit losses	7	(33)	(28)
Fixed maturity securities \| Market Value
Debt Securities, Available-for-Sale [Line Items]
Net realized gains (losses) from dispositions	(292)	(87)	17
Fixed maturity securities \| Fair Value
Debt Securities, Available-for-Sale [Line Items]
Gains (losses) from fair value adjustments	0	0	0
Equity securities: \| Market Value
Debt Securities, Available-for-Sale [Line Items]
Net realized gains (losses) from dispositions	8	112	28
Equity securities: \| Fair Value
Debt Securities, Available-for-Sale [Line Items]
Gains (losses) from fair value adjustments	0	(460)	236
Other invested assets
Debt Securities, Available-for-Sale [Line Items]
Net realized gains (losses) from dispositions	0	13	6
Short-term investments gain (loss)
Debt Securities, Available-for-Sale [Line Items]
Net realized gains (losses) from dispositions	$ 0	$ 0	$ 0

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