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, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Fixed maturity securities - available for sale
Amortized Cost	$ 35,137	$ 34,620
Allowance for Credit Losses	(53)	(68)	$ (37)	$ (36)
Unrealized Appreciation	352	640
Unrealized Depreciation	(784)	(619)
Fair Value	34,651	34,573
Fixed maturity securities – held to maturity
Amortized Cost	604	573
Allowance for Credit Losses	(8)	(6)	(8)	(8)
Unrealized Appreciation	14	18
Unrealized Depreciation	(9)	(9)
Fair Value	601	576
U.S. Treasury securities and obligations of U.S. government agencies and corporations
Fixed maturity securities - available for sale
Amortized Cost	888	845
Allowance for Credit Losses	0	0
Unrealized Appreciation	2	4
Unrealized Depreciation	(17)	(19)
Fair Value	874	830
Obligations of U.S. States and political subdivisions
Fixed maturity securities - available for sale
Amortized Cost	45	45
Allowance for Credit Losses	0	0
Unrealized Appreciation	0	0
Unrealized Depreciation	(5)	(4)
Fair Value	40	41
Corporate securities
Fixed maturity securities - available for sale
Amortized Cost	9,987	9,913
Allowance for Credit Losses	(39)	(54)	(36)	(35)
Unrealized Appreciation	110	206
Unrealized Depreciation	(215)	(183)
Fair Value	9,843	9,882
Fixed maturity securities – held to maturity
Amortized Cost	181	166
Allowance for Credit Losses	(2)	(2)	(2)	(2)
Unrealized Appreciation	4	7
Unrealized Depreciation	(2)	(1)
Fair Value	180	169
Asset-backed securities
Fixed maturity securities - available for sale
Amortized Cost	4,949	5,094
Allowance for Credit Losses	(14)	(14)	0	0
Unrealized Appreciation	5	14
Unrealized Depreciation	(43)	(17)
Fair Value	4,898	5,077
Fixed maturity securities – held to maturity
Amortized Cost	340	328
Allowance for Credit Losses	(5)	(3)	(4)	(4)
Unrealized Appreciation	5	5
Unrealized Depreciation	(7)	(8)
Fair Value	333	322
Agency commercial
Fixed maturity securities - available for sale
Amortized Cost	403	404
Allowance for Credit Losses	0	0
Unrealized Appreciation	7	9
Unrealized Depreciation	(2)	(2)
Fair Value	408	412
Non-agency commercial
Fixed maturity securities - available for sale
Amortized Cost	1,249	1,151
Allowance for Credit Losses	0	0
Unrealized Appreciation	2	4
Unrealized Depreciation	(36)	(33)
Fair Value	1,215	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	5,429	5,544
Allowance for Credit Losses	0	0
Unrealized Appreciation	53	82
Unrealized Depreciation	(174)	(161)
Fair Value	5,309	5,465
Non-agency residential
Fixed maturity securities - available for sale
Amortized Cost	1,772	1,689
Allowance for Credit Losses	0	0
Unrealized Appreciation	17	32
Unrealized Depreciation	(6)	(1)
Fair Value	1,783	1,721
Foreign government securities
Fixed maturity securities - available for sale
Amortized Cost	2,375	2,400
Allowance for Credit Losses	0	0
Unrealized Appreciation	21	36
Unrealized Depreciation	(85)	(64)
Fair Value	2,311	2,371
Foreign corporate securities
Fixed maturity securities - available for sale
Amortized Cost	8,040	7,535
Allowance for Credit Losses	0	0
Unrealized Appreciation	132	253
Unrealized Depreciation	(201)	(135)
Fair Value	7,970	7,653
Fixed maturity securities – held to maturity
Amortized Cost	83	79
Allowance for Credit Losses	(1)	(1)	$ (1)	$ (1)
Unrealized Appreciation	6	6
Unrealized Depreciation	0	0
Fair Value	$ 88	84
Mortgage-backed securities, Commercial
Fixed maturity securities – held to maturity
Amortized Cost		0
Allowance for Credit Losses		0
Unrealized Appreciation		0
Unrealized Depreciation		0
Fair Value		$ 0

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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