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INVESTMENTS - Narrative (Details) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2023 USD ($) security	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($) security
Debt Securities, Available-for-Sale [Line Items]
Fair value of the securities reclassified at the date of transfer		$ 722
Unrealized loss from transfer	$ (48)
Aggregate market value of investments in unrealized loss position	19,551		$ 19,647
Gross unrealized losses on investments in unrealized loss position	1,716		1,982
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation	296		1,217
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation	1,420		764
Additional contractual commitments	2,700
Cash surrender value of life insurance	$ 954		$ 939
Number of securities held as primary beneficiary | security	0		0
Variable Interest Entity, Not Primary Beneficiary
Debt Securities, Available-for-Sale [Line Items]
Maximum exposure to loss	$ 4,200		$ 4,100
Commitments to fund investments	$ 2,200
Investments, Debt Securities Benchmark | Issuer | Issuer One
Debt Securities, Available-for-Sale [Line Items]
Percentage of overall fair value of fixed maturity securities available for sale, less than	4.80%		5.20%
Investments, Debt Securities Benchmark | Issuer | Issuer Two
Debt Securities, Available-for-Sale [Line Items]
Percentage of overall fair value of fixed maturity securities available for sale, less than	0.80%		0.20%
Investment Grade
Debt Securities, Available-for-Sale [Line Items]
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation	$ 263		$ 1,100
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation	1,300		$ 732
Fixed maturities
Debt Securities, Available-for-Sale [Line Items]
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation	$ 1,400

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