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, 2023	Dec. 31, 2022	Dec. 31, 2021
Fixed maturity securities – available for sale
Amortized Cost	$ 16,304	$ 13,699
Allowances for Credit Loss	(48)	(46)	$ (27)
Unrealized Appreciation	212	30
Unrealized Depreciation	(536)	(1,013)
Fair Value	15,932	12,671
Fixed maturity securities - held to maturity
Amortized Cost	859	820
Allowances for Credit Loss	(8)	(9)	0
Unrealized Appreciation	12	3
Unrealized Depreciation	(13)	(22)
Fair Value	850	793
U.S. Treasury securities and obligations of U.S. government agencies and corporations
Fixed maturity securities – available for sale
Amortized Cost	265	575
Allowances for Credit Loss	0	0
Unrealized Appreciation	0	0
Unrealized Depreciation	(17)	(40)
Fair Value	247	535
Obligations of U.S. states and political subdivisions
Fixed maturity securities – available for sale
Amortized Cost	138	444
Allowances for Credit Loss	0	0
Unrealized Appreciation	1	2
Unrealized Depreciation	(11)	(32)
Fair Value	128	413
Corporate securities
Fixed maturity securities – available for sale
Amortized Cost	4,400	3,913
Allowances for Credit Loss	(47)	(45)	(19)
Unrealized Appreciation	96	14
Unrealized Depreciation	(160)	(322)
Fair Value	4,289	3,561
Fixed maturity securities - held to maturity
Amortized Cost	150	152
Allowances for Credit Loss	(2)	(2)	0
Unrealized Appreciation	1	0
Unrealized Depreciation	(3)	(6)
Fair Value	146	144
Asset-backed securities
Fixed maturity securities – available for sale
Amortized Cost	5,307	4,111
Allowances for Credit Loss	0	0	(8)
Unrealized Appreciation	23	5
Unrealized Depreciation	(48)	(165)
Fair Value	5,282	3,951
Fixed maturity securities - held to maturity
Amortized Cost	604	634
Allowances for Credit Loss	(5)	(6)	0
Unrealized Appreciation	4	2
Unrealized Depreciation	(10)	(15)
Fair Value	593	614
Commercial
Fixed maturity securities – available for sale
Amortized Cost	575	569
Allowances for Credit Loss	0	0
Unrealized Appreciation	0	0
Unrealized Depreciation	(53)	(59)
Fair Value	522	509
Fixed maturity securities - held to maturity
Amortized Cost	21	7
Allowances for Credit Loss	0	0
Unrealized Appreciation	0	0
Unrealized Depreciation	0	0
Fair Value	21	7
Agency residential
Fixed maturity securities – available for sale
Amortized Cost	2,532	1,792
Allowances for Credit Loss	0	0
Unrealized Appreciation	27	3
Unrealized Depreciation	(124)	(167)
Fair Value	2,435	1,628
Non-agency residential
Fixed maturity securities – available for sale
Amortized Cost	429	3
Allowances for Credit Loss	0	0
Unrealized Appreciation	14	0
Unrealized Depreciation	(1)	0
Fair Value	441	3
Foreign government securities
Fixed maturity securities – available for sale
Amortized Cost	859	696
Allowances for Credit Loss	0	0
Unrealized Appreciation	15	2
Unrealized Depreciation	(39)	(61)
Fair Value	835	637
Foreign corporate securities
Fixed maturity securities – available for sale
Amortized Cost	1,800	1,597
Allowances for Credit Loss	0	(1)	0
Unrealized Appreciation	35	4
Unrealized Depreciation	(82)	(167)
Fair Value	1,753	1,433
Fixed maturity securities - held to maturity
Amortized Cost	84	28
Allowances for Credit Loss	(1)	(1)	$ 0
Unrealized Appreciation	7	2
Unrealized Depreciation	0	0
Fair Value	$ 90	$ 28

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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