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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, 2026	Mar. 31, 2026	Dec. 31, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024
Fixed maturity securities - available for sale
Amortized Cost	$ 34,912		$ 34,620
Allowance for Credit Losses	(64)	$ (53)	(68)	$ (40)	$ (37)	$ (36)
Unrealized Appreciation	346		640
Unrealized Depreciation	(749)		(619)
Fair Value	34,445		34,573
Fixed maturity securities – held to maturity
Amortized Cost	576		573
Allowance for Credit Losses	(8)	(8)	(6)	(7)	(8)	(8)
Unrealized Appreciation	10		18
Unrealized Depreciation	(11)		(9)
Fair Value	568		576
U.S. Treasury securities and obligations of U.S. government agencies and corporations
Fixed maturity securities - available for sale
Amortized Cost	831		845
Allowance for Credit Losses	0		0
Unrealized Appreciation	1		4
Unrealized Depreciation	(20)		(19)
Fair Value	812		830
Tax-exempt obligations of U.S. states and political subdivisions
Fixed maturity securities - available for sale
Amortized Cost	40		45
Allowance for Credit Losses	0		0
Unrealized Appreciation	0		0
Unrealized Depreciation	(4)		(4)
Fair Value	37		41
Corporate securities
Fixed maturity securities - available for sale
Amortized Cost	9,839		9,913
Allowance for Credit Losses	(39)	(39)	(54)	(39)	(36)	(35)
Unrealized Appreciation	100		206
Unrealized Depreciation	(211)		(183)
Fair Value	9,689		9,882
Fixed maturity securities – held to maturity
Amortized Cost	180		166
Allowance for Credit Losses	(2)	(2)	(2)	(2)	(2)	(2)
Unrealized Appreciation	1		7
Unrealized Depreciation	(3)		(1)
Fair Value	176		169
Asset-backed securities
Fixed maturity securities - available for sale
Amortized Cost	5,081		5,094
Allowance for Credit Losses	(25)	(14)	(14)
Unrealized Appreciation	7		14
Unrealized Depreciation	(29)		(17)
Fair Value	5,033		5,077
Fixed maturity securities – held to maturity
Amortized Cost	318		328
Allowance for Credit Losses	(5)	(5)	(3)	(4)	(4)	(4)
Unrealized Appreciation	4		5
Unrealized Depreciation	(8)		(8)
Fair Value	310		322
Agency commercial
Fixed maturity securities - available for sale
Amortized Cost	403		404
Allowance for Credit Losses	0		0
Unrealized Appreciation	5		9
Unrealized Depreciation	(3)		(2)
Fair Value	405		412
Non-agency commercial
Fixed maturity securities - available for sale
Amortized Cost	1,232		1,151
Allowance for Credit Losses	0		0
Unrealized Appreciation	2		4
Unrealized Depreciation	(37)		(33)
Fair Value	1,198		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	5,280		5,544
Allowance for Credit Losses	0		0
Unrealized Appreciation	43		82
Unrealized Depreciation	(185)		(161)
Fair Value	5,138		5,465
Non-agency residential
Fixed maturity securities - available for sale
Amortized Cost	1,767		1,689
Allowance for Credit Losses	0		0
Unrealized Appreciation	13		32
Unrealized Depreciation	(9)		(1)
Fair Value	1,771		1,721
Foreign government securities
Fixed maturity securities - available for sale
Amortized Cost	2,286		2,400
Allowance for Credit Losses	0		0
Unrealized Appreciation	21		36
Unrealized Depreciation	(81)		(64)
Fair Value	2,226		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	8,152		7,535
Allowance for Credit Losses	0		0	0	0	0
Unrealized Appreciation	155		253
Unrealized Depreciation	(171)		(135)
Fair Value	8,136		7,653
Fixed maturity securities – held to maturity
Amortized Cost	78		79
Allowance for Credit Losses	(1)	$ (1)	(1)	$ (1)	$ (1)	$ (1)
Unrealized Appreciation	5		6
Unrealized Depreciation	0		0
Fair Value	$ 82		$ 84