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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, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Fixed maturity securities - available for sale
Amortized Cost	$ 30,753		$ 28,568
Allowance for Credit Losses	(51)	$ (42)	(48)	$ (60)	$ (63)	$ (54)
Unrealized Appreciation	570		358
Unrealized Depreciation	(793)		(1,137)
Fair Value	30,479		27,740
Fixed maturity securities - held to maturity
Amortized Cost	788		864
Allowance for Credit Losses	(8)	(8)	(8)	(8)	(8)	(9)
Unrealized Appreciation	24		12
Unrealized Depreciation	(5)		(13)
Fair Value	799		854
U.S. Treasury securities and obligations of U.S. government agencies and corporations
Fixed maturity securities - available for sale
Amortized Cost	742		1,045
Allowance for Credit Losses	0		0
Unrealized Appreciation	2		3
Unrealized Depreciation	(35)		(52)
Fair Value	709		996
Obligations of U.S. states and political subdivisions
Fixed maturity securities - available for sale
Amortized Cost	87		138
Allowance for Credit Losses	0		0	(1)	0	0
Unrealized Appreciation	1		1
Unrealized Depreciation	(4)		(11)
Fair Value	84		128
Corporate Securities
Fixed maturity securities - available for sale
Amortized Cost	8,257		7,587
Allowance for Credit Losses	(50)	(42)	(47)	(57)	(56)	(45)
Unrealized Appreciation	203		135
Unrealized Depreciation	(215)		(322)
Fair Value	8,195		7,353
Fixed maturity securities - held to maturity
Amortized Cost	182		150
Allowance for Credit Losses	(2)	(2)	(2)	(2)	(2)	(2)
Unrealized Appreciation	8		1
Unrealized Depreciation	(1)		(3)
Fair Value	187		146
Asset-backed Securities
Fixed maturity securities - available for sale
Amortized Cost	5,900		5,644
Allowance for Credit Losses	0		0
Unrealized Appreciation	35		25
Unrealized Depreciation	(20)		(51)
Fair Value	5,915		5,618
Fixed maturity securities - held to maturity
Amortized Cost	501		609
Allowance for Credit Losses	(5)	(5)	(5)	(5)	(6)	(6)
Unrealized Appreciation	8		4
Unrealized Depreciation	(4)		(10)
Fair Value	501		597
Commercial
Fixed maturity securities - available for sale
Amortized Cost	990		1,091
Allowance for Credit Losses	0		0
Unrealized Appreciation	4		1
Unrealized Depreciation	(56)		(92)
Fair Value	937		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	4,662		4,869
Allowance for Credit Losses	0		0
Unrealized Appreciation	67		55
Unrealized Depreciation	(173)		(229)
Fair Value	4,556		4,695
Non-agency Residential
Fixed maturity securities - available for sale
Amortized Cost	1,325		431
Allowance for Credit Losses	0		0
Unrealized Appreciation	34		14
Unrealized Depreciation	0		(2)
Fair Value	1,359		443
Foreign government securities
Fixed maturity securities - available for sale
Amortized Cost	2,388		2,042
Allowance for Credit Losses	0		0
Unrealized Appreciation	46		33
Unrealized Depreciation	(96)		(108)
Fair Value	2,338		1,967
Foreign corporate securities
Fixed maturity securities - available for sale
Amortized Cost	6,401		5,720
Allowance for Credit Losses	0	0	(1)	(3)	(7)	(10)
Unrealized Appreciation	178		92
Unrealized Depreciation	(193)		(271)
Fair Value	6,386		5,540
Fixed maturity securities - held to maturity
Amortized Cost	84		84
Allowance for Credit Losses	(1)	$ (1)	(1)	$ (1)	$ (1)	$ (1)
Unrealized Appreciation	9		7
Unrealized Depreciation	0		0
Fair Value	$ 91		$ 90

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