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INVESTMENTS - Schedule of Amortized Cost, Allowance for Credit Losses, Gross Unrealized Appreciation/(Depreciation) and Fair Value of 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
Fixed maturity securities - available for sale
Amortized Cost	$ 30,134		$ 28,568
Allowance for Credit Losses	(42)	$ (46)	(48)	$ (63)	$ (62)	$ (54)
Unrealized Appreciation	188		358
Unrealized Depreciation	(1,249)		(1,137)
Fair Value	29,031		27,740
Fixed maturity securities - held to maturity
Amortized Cost	796		864
Allowance for Credit Losses	(8)	(9)	(8)	(8)	(9)	(9)
Unrealized Appreciation	14		12
Unrealized Depreciation	(13)		(13)
Fair Value	788		854
U.S. Treasury securities and obligations of U.S. government agencies and corporations
Fixed maturity securities - available for sale
Amortized Cost	1,070		1,045
Allowance for Credit Losses	0		0
Unrealized Appreciation	3		3
Unrealized Depreciation	(49)		(52)
Fair Value	1,024		996
Obligations of U.S. states and political subdivisions
Fixed maturity securities - available for sale
Amortized Cost	114		138
Allowance for Credit Losses	0		0
Unrealized Appreciation	1		1
Unrealized Depreciation	(9)		(11)
Fair Value	105		128
Corporate Securities
Fixed maturity securities - available for sale
Amortized Cost	8,297		7,587
Allowance for Credit Losses	(42)	(45)	(47)	(56)	(55)	(45)
Unrealized Appreciation	70		135
Unrealized Depreciation	(347)		(322)
Fair Value	7,979		7,353
Fixed maturity securities - held to maturity
Amortized Cost	173		150
Allowance for Credit Losses	(2)	(2)	(2)	(2)	(2)	(2)
Unrealized Appreciation	5		1
Unrealized Depreciation	(5)		(3)
Fair Value	171		146
Asset-backed Securities
Fixed maturity securities - available for sale
Amortized Cost	5,317		5,644
Allowance for Credit Losses	0		0
Unrealized Appreciation	27		25
Unrealized Depreciation	(27)		(51)
Fair Value	5,317		5,618
Fixed maturity securities - held to maturity
Amortized Cost	517		609
Allowance for Credit Losses	(5)	(5)	(5)	(5)	(6)	(6)
Unrealized Appreciation	5		4
Unrealized Depreciation	(8)		(10)
Fair Value	509		597
Commercial
Fixed maturity securities - available for sale
Amortized Cost	1,016		1,091
Allowance for Credit Losses	0		0
Unrealized Appreciation	1		1
Unrealized Depreciation	(83)		(92)
Fair Value	934		1,000
Fixed maturity securities - held to maturity
Amortized Cost	21		21
Allowance for Credit Losses	0		0
Unrealized Appreciation	0		0
Unrealized Depreciation	0		0
Fair Value	21		21
Agency Residential
Fixed maturity securities - available for sale
Amortized Cost	5,025		4,869
Allowance for Credit Losses	0		0
Unrealized Appreciation	22		55
Unrealized Depreciation	(302)		(229)
Fair Value	4,745		4,695
Non-agency Residential
Fixed maturity securities - available for sale
Amortized Cost	940		431
Allowance for Credit Losses	0		0
Unrealized Appreciation	8		14
Unrealized Depreciation	(5)		(2)
Fair Value	943		443
Foreign government securities
Fixed maturity securities - available for sale
Amortized Cost	2,370		2,042
Allowance for Credit Losses	0		0
Unrealized Appreciation	11		33
Unrealized Depreciation	(140)		(108)
Fair Value	2,240		1,967
Foreign corporate securities
Fixed maturity securities - available for sale
Amortized Cost	5,985		5,720
Allowance for Credit Losses	0	0	(1)	(7)	(7)	(10)
Unrealized Appreciation	46		92
Unrealized Depreciation	(287)		(271)
Fair Value	5,744		5,540
Fixed maturity securities - held to maturity
Amortized Cost	84		84
Allowance for Credit Losses	(1)	$ (1)	(1)	$ (1)	$ (1)	$ (1)
Unrealized Appreciation	4		7
Unrealized Depreciation	0		0
Fair Value	$ 87		$ 90

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