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AVAILABLE-FOR-SALE FIXED MATURITY SECURITIES - Schedule of Amortized Cost and Fair Value of Available-for-Sale Fixed Maturity Securities (Details) - USD ($) $ in Millions	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	$ 55,653		$ 53,651
Gross Unrealized Gains	1,183		845
Gross Unrealized Losses	(611)		(667)
Allowance for Credit Losses	(3)	$ (12)	(27)	$ (43)	$ (32)	$ (30)
Fair Value	56,222		53,802
U.S. treasury and government
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	403		410
Gross Unrealized Gains	4		2
Gross Unrealized Losses	(42)		(43)
Allowance for Credit Losses	0		0
Fair Value	365		369
U.S. state and municipal
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	3,152		3,280
Gross Unrealized Gains	65		39
Gross Unrealized Losses	(35)		(30)
Allowance for Credit Losses	0		0
Fair Value	3,182		3,289
Foreign governments
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	1,903		2,082
Gross Unrealized Gains	21		11
Gross Unrealized Losses	(35)		(51)
Allowance for Credit Losses	0		0
Fair Value	1,889		2,042
Corporate debt securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	39,073		37,312
Gross Unrealized Gains	818		571
Gross Unrealized Losses	(396)		(477)
Allowance for Credit Losses	(2)	(10)	(26)	(35)	(24)	(19)
Fair Value	39,493		37,380
Residential mortgage-backed securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	1,158		1,288
Gross Unrealized Gains	40		28
Gross Unrealized Losses	(2)		(5)
Allowance for Credit Losses	0	(1)	(1)	0	0	(1)
Fair Value	1,196		1,310
Commercial mortgage-backed securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	3,796		3,259
Gross Unrealized Gains	120		91
Gross Unrealized Losses	(39)		(30)
Allowance for Credit Losses	0	0	0	(6)	(6)	(6)
Fair Value	3,877		3,320
Collateralized debt securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	6,168		6,020
Gross Unrealized Gains	115		103
Gross Unrealized Losses	(62)		(31)
Allowance for Credit Losses	(1)	$ (1)	0	$ (2)	$ (2)	$ (4)
Fair Value	$ 6,220		$ 6,092

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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