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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	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Fixed maturity securities - available for sale
Amortized Cost	$ 32,505	$ 29,934
Allowance for Credit Losses	(37)	(36)	$ (46)	$ (48)
Unrealized Appreciation	277	167
Unrealized Depreciation	(921)	(1,157)
Fair Value	31,824	28,908
Fixed maturity securities - held to maturity
Amortized Cost	703	765
Allowance for Credit Losses	(8)	(8)	(9)	(8)
Unrealized Appreciation	16	14
Unrealized Depreciation	(9)	(12)
Fair Value	702	759
U.S. Treasury securities and obligations of U.S. government agencies and corporations
Fixed maturity securities - available for sale
Amortized Cost	624	688
Allowance for Credit Losses	0	0
Unrealized Appreciation	3	5
Unrealized Depreciation	(22)	(24)
Fair Value	604	669
Obligations of U.S. states and political subdivisions
Fixed maturity securities - available for sale
Amortized Cost	74	75
Allowance for Credit Losses	0	0
Unrealized Appreciation	0	0
Unrealized Depreciation	(6)	(5)
Fair Value	68	70
Corporate Securities
Fixed maturity securities - available for sale
Amortized Cost	8,884	7,288
Allowance for Credit Losses	(36)	(35)	(45)	(47)
Unrealized Appreciation	85	57
Unrealized Depreciation	(247)	(299)
Fair Value	8,686	7,010
Fixed maturity securities - held to maturity
Amortized Cost	169	177
Allowance for Credit Losses	(2)	(2)	(2)	(2)
Unrealized Appreciation	5	5
Unrealized Depreciation	(3)	(4)
Fair Value	169	175
Asset-backed Securities
Fixed maturity securities - available for sale
Amortized Cost	5,588	5,994
Allowance for Credit Losses	0	0
Unrealized Appreciation	25	28
Unrealized Depreciation	(22)	(39)
Fair Value	5,591	5,982
Fixed maturity securities - held to maturity
Amortized Cost	435	484
Allowance for Credit Losses	(4)	(4)	(5)	(5)
Unrealized Appreciation	5	5
Unrealized Depreciation	(6)	(8)
Fair Value	430	477
Commercial
Fixed maturity securities - available for sale
Amortized Cost	957	965
Allowance for Credit Losses	0	0
Unrealized Appreciation	3	1
Unrealized Depreciation	(54)	(66)
Fair Value	906	900
Fixed maturity securities - held to maturity
Amortized Cost	15	21
Allowance for Credit Losses	0	0
Unrealized Appreciation	0	0
Unrealized Depreciation	0	0
Fair Value	15	21
Agency Residential
Fixed maturity securities - available for sale
Amortized Cost	5,561	5,205
Allowance for Credit Losses	0	0
Unrealized Appreciation	36	13
Unrealized Depreciation	(221)	(287)
Fair Value	5,377	4,931
Non-agency Residential
Fixed maturity securities - available for sale
Amortized Cost	1,452	1,291
Allowance for Credit Losses	0	0
Unrealized Appreciation	23	9
Unrealized Depreciation	(4)	(11)
Fair Value	1,471	1,289
Foreign government securities
Fixed maturity securities - available for sale
Amortized Cost	2,381	2,330
Allowance for Credit Losses	0	0
Unrealized Appreciation	17	13
Unrealized Depreciation	(129)	(147)
Fair Value	2,269	2,196
Foreign corporate securities
Fixed maturity securities - available for sale
Amortized Cost	6,984	6,099
Allowance for Credit Losses	0	0	0	(1)
Unrealized Appreciation	85	42
Unrealized Depreciation	(216)	(279)
Fair Value	6,853	5,861
Fixed maturity securities - held to maturity
Amortized Cost	84	84
Allowance for Credit Losses	(1)	(1)	$ (1)	$ (1)
Unrealized Appreciation	6	4
Unrealized Depreciation	0	0
Fair Value	$ 88	$ 86

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