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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	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Fixed maturity securities - available for sale
Amortized Cost	$ 34,049		$ 29,934
Allowance for Credit Losses	(51)	$ (40)	(36)	$ (51)	$ (42)	$ (48)
Unrealized Appreciation	621		167
Unrealized Depreciation	(708)		(1,157)
Fair Value	33,912		28,908
Fixed maturity securities – held to maturity
Amortized Cost	610		765
Allowance for Credit Losses	(6)	(7)	(8)	(8)	(8)	(8)
Unrealized Appreciation	19		14
Unrealized Depreciation	(10)		(12)
Fair Value	613		759
U.S. Treasury securities and obligations of U.S. government agencies and corporations
Fixed maturity securities - available for sale
Amortized Cost	770		688
Allowance for Credit Losses	0		0
Unrealized Appreciation	4		5
Unrealized Depreciation	(22)		(24)
Fair Value	752		669
Obligations of U.S. States and political subdivisions
Fixed maturity securities - available for sale
Amortized Cost	55		75
Allowance for Credit Losses	0		0
Unrealized Appreciation	0		0
Unrealized Depreciation	(6)		(5)
Fair Value	49		70
Corporate securities
Fixed maturity securities - available for sale
Amortized Cost	9,734		7,288
Allowance for Credit Losses	(38)	(39)	(35)	(50)	(42)	(47)
Unrealized Appreciation	199		57
Unrealized Depreciation	(189)		(299)
Fair Value	9,705		7,010
Fixed maturity securities – held to maturity
Amortized Cost	167		177
Allowance for Credit Losses	(2)	(2)	(2)	(2)	(2)	(2)
Unrealized Appreciation	7		5
Unrealized Depreciation	(1)		(4)
Fair Value	170		175
Asset-backed securities
Fixed maturity securities - available for sale
Amortized Cost	5,049		5,994
Allowance for Credit Losses	(14)	0	0	0	0	0
Unrealized Appreciation	23		28
Unrealized Depreciation	(15)		(39)
Fair Value	5,044		5,982
Fixed maturity securities – held to maturity
Amortized Cost	364		484
Allowance for Credit Losses	(3)	(4)	(4)	(5)	(5)	(5)
Unrealized Appreciation	6		5
Unrealized Depreciation	(8)		(8)
Fair Value	358		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	1		21
Allowance for Credit Losses	0		0
Unrealized Appreciation	0		0
Unrealized Depreciation	0		0
Fair Value	1		21
Agency commercial
Fixed maturity securities - available for sale
Amortized Cost	402		0
Allowance for Credit Losses	0
Unrealized Appreciation	9
Unrealized Depreciation	(1)
Fair Value	409		0
Non-agency commercial
Fixed maturity securities - available for sale
Amortized Cost	907		965
Allowance for Credit Losses	0
Unrealized Appreciation	4
Unrealized Depreciation	(39)
Fair Value	872		900
Agency residential
Fixed maturity securities - available for sale
Amortized Cost	5,594		5,205
Allowance for Credit Losses	0		0
Unrealized Appreciation	68		13
Unrealized Depreciation	(178)		(287)
Fair Value	5,484		4,931
Non-agency residential
Fixed maturity securities - available for sale
Amortized Cost	1,562		1,291
Allowance for Credit Losses	0		0
Unrealized Appreciation	35		9
Unrealized Depreciation	(1)		(11)
Fair Value	1,595		1,289
Foreign government securities
Fixed maturity securities - available for sale
Amortized Cost	2,534		2,330
Allowance for Credit Losses	0		0
Unrealized Appreciation	35		13
Unrealized Depreciation	(100)		(147)
Fair Value	2,470		2,196
Foreign corporate securities
Fixed maturity securities - available for sale
Amortized Cost	7,443		6,099
Allowance for Credit Losses	0	0	0	0	0	(1)
Unrealized Appreciation	245		42
Unrealized Depreciation	(157)		(279)
Fair Value	7,531		5,861
Fixed maturity securities – held to maturity
Amortized Cost	79		84
Allowance for Credit Losses	(1)	$ (1)	(1)	$ (1)	$ (1)	$ (1)
Unrealized Appreciation	6		4
Unrealized Depreciation	0		0
Fair Value	$ 84		$ 86