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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, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Fixed maturity securities - available for sale
Amortized Cost	$ 33,791		$ 29,934
Allowance for Credit Losses	(40)	$ (37)	(36)	$ (42)	$ (46)	$ (48)
Unrealized Appreciation	583		167
Unrealized Depreciation	(870)		(1,157)
Fair Value	33,464		28,908
Fixed maturity securities – held to maturity
Amortized Cost	658		765
Allowance for Credit Losses	(7)	(8)	(8)	(8)	(9)	(8)
Unrealized Appreciation	15		14
Unrealized Depreciation	(10)		(12)
Fair Value	657		759
U.S. Treasury securities and obligations of U.S. government agencies and corporations
Fixed maturity securities - available for sale
Amortized Cost	688		688
Allowance for Credit Losses	0		0
Unrealized Appreciation	3		5
Unrealized Depreciation	(29)		(24)
Fair Value	662		669
Obligations of U.S. States and political subdivisions
Fixed maturity securities - available for sale
Amortized Cost	57		75
Allowance for Credit Losses	0		0
Unrealized Appreciation	0		0
Unrealized Depreciation	(7)		(5)
Fair Value	50		70
Corporate securities
Fixed maturity securities - available for sale
Amortized Cost	9,628		7,288
Allowance for Credit Losses	(39)	(36)	(35)	(42)	(45)	(47)
Unrealized Appreciation	169		57
Unrealized Depreciation	(254)		(299)
Fair Value	9,504		7,010
Fixed maturity securities – held to maturity
Amortized Cost	168		177
Allowance for Credit Losses	(2)	(2)	(2)	(2)	(2)	(2)
Unrealized Appreciation	5		5
Unrealized Depreciation	(2)		(4)
Fair Value	169		175
Asset-backed securities
Fixed maturity securities - available for sale
Amortized Cost	5,390		5,994
Allowance for Credit Losses	0		0
Unrealized Appreciation	21		28
Unrealized Depreciation	(30)		(39)
Fair Value	5,380		5,982
Fixed maturity securities – held to maturity
Amortized Cost	404		484
Allowance for Credit Losses	(4)	(4)	(4)	(5)	(5)	(5)
Unrealized Appreciation	5		5
Unrealized Depreciation	(7)		(8)
Fair Value	398		477
Commercial
Fixed maturity securities - available for sale
Amortized Cost			965
Allowance for Credit Losses			0
Unrealized Appreciation			1
Unrealized Depreciation			(66)
Fair Value			900
Fixed maturity securities – held to maturity
Amortized Cost	7		21
Allowance for Credit Losses	0		0
Unrealized Appreciation	0		0
Unrealized Depreciation	0		0
Fair Value	7		21
Agency commercial
Fixed maturity securities - available for sale
Amortized Cost	208		0
Allowance for Credit Losses	0
Unrealized Appreciation	3
Unrealized Depreciation	(2)
Fair Value	210		0
Non-agency commercial
Fixed maturity securities - available for sale
Amortized Cost	950		965
Allowance for Credit Losses	0
Unrealized Appreciation	3
Unrealized Depreciation	(45)
Fair Value	908		900
Agency residential
Fixed maturity securities - available for sale
Amortized Cost	5,695		5,205
Allowance for Credit Losses	0		0
Unrealized Appreciation	40		13
Unrealized Depreciation	(216)		(287)
Fair Value	5,519		4,931
Non-agency residential
Fixed maturity securities - available for sale
Amortized Cost	1,459		1,291
Allowance for Credit Losses	0		0
Unrealized Appreciation	25		9
Unrealized Depreciation	(3)		(11)
Fair Value	1,480		1,289
Foreign government securities
Fixed maturity securities - available for sale
Amortized Cost	2,382		2,330
Allowance for Credit Losses	0		0
Unrealized Appreciation	44		13
Unrealized Depreciation	(102)		(147)
Fair Value	2,325		2,196
Foreign corporate securities
Fixed maturity securities - available for sale
Amortized Cost	7,334		6,099
Allowance for Credit Losses	0	0	0	0	0	(1)
Unrealized Appreciation	275		42
Unrealized Depreciation	(182)		(279)
Fair Value	7,426		5,861
Fixed maturity securities – held to maturity
Amortized Cost	79		84
Allowance for Credit Losses	(1)	$ (1)	(1)	$ (1)	$ (1)	$ (1)
Unrealized Appreciation	5		4
Unrealized Depreciation	0		0
Fair Value	$ 83		$ 86

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