INVESTMENTS - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Debt Securities, Available-for-Sale [Line Items]
Aggregate market value of investments in unrealized loss position	$ 14,656		$ 18,332
Gross unrealized losses on investments in unrealized loss position	921		1,157
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation	201		324
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation	720		833
Additional contractual commitments	3,200
Cash surrender value of life insurance	1,800		1,700
Held to maturity, carrying amount, net	11
Realized losses	1	$ 0
Variable Interest Entity, Not Primary Beneficiary
Debt Securities, Available-for-Sale [Line Items]
Commitments to fund investments	2,100
Partnership Interest
Debt Securities, Available-for-Sale [Line Items]
Maximum exposure to loss	$ 3,600		$ 3,600
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	1.40%		1.60%
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%		0.90%
Investment Grade
Debt Securities, Available-for-Sale [Line Items]
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation	$ 189		$ 319
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation	704		810
Fixed maturities
Debt Securities, Available-for-Sale [Line Items]
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation			324
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation	$ 720		$ 833

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