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INVESTMENTS - Narrative (Details) $ in Millions	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) security	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) security
Debt Securities, Available-for-Sale [Line Items]
Reclassification of specific investments from fixed maturity securities, available for sale at fair value to fixed maturity securities, held to maturity at amortized cost net of credit allowances	$ 722	$ 0	$ 722
Unrealized loss from transfer		(44)
Aggregate market value of investments in unrealized loss position		21,445		$ 19,647
Gross unrealized losses on investments in unrealized loss position		2,143		1,982
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation		320		1,217
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation		1,823		764
Additional contractual commitments		2,800
Cash surrender value of life insurance		$ 984		$ 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		$ 4,400		$ 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		4.20%		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		0.70%		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		$ 288		$ 1,100
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation		1,500		$ 732
Fixed maturities
Debt Securities, Available-for-Sale [Line Items]
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation		$ 1,800

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