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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, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	$ 52,808		$ 19,341
Gross Unrealized Gains	777		201
Gross Unrealized Losses	(945)		(735)
Allowance for Credit Losses	(43)	$ (32)	(30)	$ (39)	$ (23)	$ (30)
Fair Value	52,597		18,777
U.S. treasury and government
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	436		529
Gross Unrealized Gains	1		4
Gross Unrealized Losses	(39)		(36)
Allowance for Credit Losses	0		0
Fair Value	398		497
U.S. states and political subdivisions
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	3,324		684
Gross Unrealized Gains	85		3
Gross Unrealized Losses	(25)		(17)
Allowance for Credit Losses	0		0
Fair Value	3,384		670
Foreign governments
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	1,002		603
Gross Unrealized Gains	18		27
Gross Unrealized Losses	(30)		(16)
Allowance for Credit Losses	0		0
Fair Value	990		614
Corporate debt securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	36,508		15,097
Gross Unrealized Gains	537		121
Gross Unrealized Losses	(782)		(607)
Allowance for Credit Losses	(35)	(24)	(19)	(23)	(13)	(24)
Fair Value	36,228		14,592
Residential mortgage-backed securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	1,292		367
Gross Unrealized Gains	25		14
Gross Unrealized Losses	(8)		(4)
Allowance for Credit Losses	0	0	(1)	0	0	0
Fair Value	1,309		376
Commercial mortgage-backed securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	3,450		750
Gross Unrealized Gains	56		13
Gross Unrealized Losses	(37)		(31)
Allowance for Credit Losses	(6)	(6)	(6)	0	0	0
Fair Value	3,463		726
Collateralized debt securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	6,796		1,311
Gross Unrealized Gains	55		19
Gross Unrealized Losses	(24)		(24)
Allowance for Credit Losses	(2)	$ (2)	(4)	$ (16)	$ (10)	$ (6)
Fair Value	$ 6,825		$ 1,302

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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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