INVESTMENTS - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) security	Dec. 31, 2022 USD ($) security	Dec. 31, 2021 USD ($)
Debt Securities, Available-for-Sale [Line Items]
Fair value of securities, net of allowance	$ 0	$ 722	$ 0
Unrealized loss from transfer	287	848
Fair value of investments in unrealized loss position	7,556	11,222
Gross unrealized losses on investments in unrealized loss position	536	1,013
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation	55	591
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation	481	421
Additional contractual commitments	1,000
Cash surrender value of life insurance	$ 1,300	$ 939
Number of securities held as primary beneficiary | security	0	0
Securities, carrying value	$ 1,400
Variable Interest Entity, Not Primary Beneficiary
Debt Securities, Available-for-Sale [Line Items]
Maximum exposure to loss	3,300	$ 2,800
Commitments to fund investments	$ 972
Investments, Debt Securities Benchmark | Issuer Concentration Risk | Issuer One
Debt Securities, Available-for-Sale [Line Items]
Concentration credit risk	1.40%	4.30%
Investments, Debt Securities Benchmark | Issuer Concentration Risk | Issuer Two
Debt Securities, Available-for-Sale [Line Items]
Concentration credit risk	0.50%	0.60%
Debt Securities, Held To Maturity
Debt Securities, Available-for-Sale [Line Items]
Unrealized loss from transfer	$ 42
Investment Grade
Debt Securities, Available-for-Sale [Line Items]
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation	39	$ 520
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation	455	392
Fixed maturities
Debt Securities, Available-for-Sale [Line Items]
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation		591
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation	$ 481	$ 421