INVESTMENTS - Schedule of Amortized Cost, Allowance for Credit Losses, Gross Unrealized Appreciation/(Depreciation) and Fair Value of Fixed Maturity Securities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Fixed maturity securities - available for sale
Amortized Cost	$ 29,934	$ 28,568
Allowance for Credit Losses	(36)	(48)	$ (54)
Unrealized Appreciation	167	358
Unrealized Depreciation	(1,157)	(1,137)
Fair Value	28,908	27,740
Fixed maturity securities - held to maturity
Amortized Cost	765	864
Allowance for Credit Losses	(8)	(8)	(9)
Unrealized Appreciation	14	12
Unrealized Depreciation	(12)	(13)
Fair Value	759	854
U.S. Treasury securities and obligations of U.S. government agencies and corporations
Fixed maturity securities - available for sale
Amortized Cost	688	1,045
Allowance for Credit Losses	0	0
Unrealized Appreciation	5	3
Unrealized Depreciation	(24)	(52)
Fair Value	669	996
Obligations of U.S. States and political subdivisions
Fixed maturity securities - available for sale
Amortized Cost	75	138
Allowance for Credit Losses	0	0
Unrealized Appreciation	0	1
Unrealized Depreciation	(5)	(11)
Fair Value	70	128
Corporate securities
Fixed maturity securities - available for sale
Amortized Cost	7,288	7,587
Allowance for Credit Losses	(35)	(47)	(45)
Unrealized Appreciation	57	135
Unrealized Depreciation	(299)	(322)
Fair Value	7,010	7,353
Fixed maturity securities - held to maturity
Amortized Cost	177	150
Allowance for Credit Losses	(2)	(2)	(2)
Unrealized Appreciation	5	1
Unrealized Depreciation	(4)	(3)
Fair Value	175	146
Asset-backed securities
Fixed maturity securities - available for sale
Amortized Cost	5,994	5,644
Allowance for Credit Losses	0	0
Unrealized Appreciation	28	25
Unrealized Depreciation	(39)	(51)
Fair Value	5,982	5,618
Fixed maturity securities - held to maturity
Amortized Cost	484	609
Allowance for Credit Losses	(4)	(5)	(6)
Unrealized Appreciation	5	4
Unrealized Depreciation	(8)	(10)
Fair Value	477	597
Commercial
Fixed maturity securities - available for sale
Amortized Cost	965	1,091
Allowance for Credit Losses	0	0
Unrealized Appreciation	1	1
Unrealized Depreciation	(66)	(92)
Fair Value	900	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	5,205	4,869
Allowance for Credit Losses	0	0
Unrealized Appreciation	13	55
Unrealized Depreciation	(287)	(229)
Fair Value	4,931	4,695
Non-agency residential
Fixed maturity securities - available for sale
Amortized Cost	1,291	431
Allowance for Credit Losses	0	0
Unrealized Appreciation	9	14
Unrealized Depreciation	(11)	(2)
Fair Value	1,289	443
Foreign government securities
Fixed maturity securities - available for sale
Amortized Cost	2,330	2,042
Allowance for Credit Losses	0	0
Unrealized Appreciation	13	33
Unrealized Depreciation	(147)	(108)
Fair Value	2,196	1,967
Foreign corporate securities
Fixed maturity securities - available for sale
Amortized Cost	6,099	5,720
Allowance for Credit Losses	0	(1)	(10)
Unrealized Appreciation	42	92
Unrealized Depreciation	(279)	(271)
Fair Value	5,861	5,540
Fixed maturity securities - held to maturity
Amortized Cost	84	84
Allowance for Credit Losses	(1)	(1)	$ (1)
Unrealized Appreciation	4	7
Unrealized Depreciation	0	0
Fair Value	$ 86	$ 90

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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