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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, 2026	Jun. 30, 2026	Dec. 31, 2025	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024
Fixed maturity securities - available for sale
Amortized Cost	$ 34,680		$ 34,620
Allowance for Credit Losses	(115)	$ (64)	(68)	$ (51)	$ (40)	$ (36)
Unrealized Appreciation	142		640
Unrealized Depreciation	(1,648)		(619)
Fair Value	33,058		34,573
Fixed maturity securities - held to maturity
Amortized Cost	571		573
Allowance for Credit Losses	(7)		(6)
Unrealized Appreciation	5		18
Unrealized Depreciation	(20)		(9)
Fair Value	549		576
U.S. Treasury securities and obligations of U.S. government agencies and corporations
Fixed maturity securities - available for sale
Amortized Cost	817		845
Allowance for Credit Losses	0		0
Unrealized Appreciation	1		4
Unrealized Depreciation	(41)		(19)
Fair Value	777		830
Tax-exempt obligations of U.S. states and political subdivisions
Fixed maturity securities - available for sale
Amortized Cost	39		45
Allowance for Credit Losses	0		0
Unrealized Appreciation	0		0
Unrealized Depreciation	(7)		(4)
Fair Value	32		41
Corporate securities
Fixed maturity securities - available for sale
Amortized Cost	9,782		9,913
Allowance for Credit Losses	(40)	(39)	(54)	(38)	(39)	(35)
Unrealized Appreciation	39		206
Unrealized Depreciation	(483)		(183)
Fair Value	9,298		9,882
Fixed maturity securities - held to maturity
Amortized Cost	169		166
Allowance for Credit Losses	(2)		(2)
Unrealized Appreciation	0		7
Unrealized Depreciation	(8)		(1)
Fair Value	160		169
Asset-backed securities
Fixed maturity securities - available for sale
Amortized Cost	5,074		5,094
Allowance for Credit Losses	(75)	(25)	(14)	(14)	0	0
Unrealized Appreciation	2		14
Unrealized Depreciation	(116)		(17)
Fair Value	4,885		5,077
Fixed maturity securities - held to maturity
Amortized Cost	324		328
Allowance for Credit Losses	(5)		(3)
Unrealized Appreciation	3		5
Unrealized Depreciation	(11)		(8)
Fair Value	311		322
Agency commercial
Fixed maturity securities - available for sale
Amortized Cost	404		404
Allowance for Credit Losses	0		0
Unrealized Appreciation	0		9
Unrealized Depreciation	(42)		(2)
Fair Value	363		412
Non-agency commercial
Fixed maturity securities - available for sale
Amortized Cost	1,301		1,151
Allowance for Credit Losses	0		0
Unrealized Appreciation	0		4
Unrealized Depreciation	(48)		(33)
Fair Value	1,253		1,121
Fixed maturity securities - held to maturity
Amortized Cost	0
Allowance for Credit Losses	0
Unrealized Appreciation	0
Unrealized Depreciation	0
Fair Value	0
Agency residential
Fixed maturity securities - available for sale
Amortized Cost	5,147		5,544
Allowance for Credit Losses	0		0
Unrealized Appreciation	0		82
Unrealized Depreciation	(404)		(161)
Fair Value	4,743		5,465
Non-agency residential
Fixed maturity securities - available for sale
Amortized Cost	1,723		1,689
Allowance for Credit Losses	0		0
Unrealized Appreciation	0		32
Unrealized Depreciation	(79)		(1)
Fair Value	1,644		1,721
Foreign government securities
Fixed maturity securities - available for sale
Amortized Cost	2,243		2,400
Allowance for Credit Losses	0		0
Unrealized Appreciation	11		36
Unrealized Depreciation	(119)		(64)
Fair Value	2,135		2,371
Commercial
Fixed maturity securities - held to maturity
Amortized Cost			0
Allowance for Credit Losses			0
Unrealized Appreciation			0
Unrealized Depreciation			0
Fair Value			0
Foreign corporate securities
Fixed maturity securities - available for sale
Amortized Cost	8,149		7,535
Allowance for Credit Losses	0	$ 0	0	$ 0	$ 0	$ 0
Unrealized Appreciation	88		253
Unrealized Depreciation	(308)		(135)
Fair Value	7,930		7,653
Fixed maturity securities - held to maturity
Amortized Cost	78		79
Allowance for Credit Losses	(1)		(1)
Unrealized Appreciation	1		6
Unrealized Depreciation	(1)		0
Fair Value	$ 78		$ 84