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INVESTMENTS (Tables)

12 Months Ended

Dec. 31, 2024

Investments, Debt and Equity Securities [Abstract]

Schedule of Amortized Cost, Allowance for Credit Losses, Gross Unrealized Appreciation/(Depreciation) and Fair Value of Fixed Maturity Securities

The tables below present the amortized cost, allowance for credit losses, gross unrealized appreciation/(depreciation) (“URA(D)”) and fair value of fixed maturity securities - available for sale for the periods indicated:

			At December 31, 2024
(Dollars in millions)			Amortized Cost						Allowance for Credit Losses						Unrealized Appreciation						Unrealized Depreciation						Fair Value
Fixed maturity securities - available for sale
U.S. Treasury securities and obligations of
U.S. government agencies and corporations			$	688					$	—					$	5					$	(24)					$	669
Obligations of U.S. states and political subdivisions			75						—						—						(5)						70
Corporate securities			7,288						(35)						57						(299)						7,010
Asset-backed securities			5,994						—						28						(39)						5,982
Mortgage-backed securities
Commercial			965						—						1						(66)						900
Agency residential			5,205						—						13						(287)						4,931
Non-agency residential			1,291						—						9						(11)						1,289
Foreign government securities			2,330						—						13						(147)						2,196
Foreign corporate securities			6,099						—						42						(279)						5,861
Total fixed maturity securities - available for sale			$	29,934					$	(36)					$	167					$	(1,157)					$	28,908

(Some amounts may not reconcile due to rounding.)

			At December 31, 2023
(Dollars in millions)			Amortized Cost						Allowance for Credit Losses						Unrealized Appreciation						Unrealized Depreciation						Fair Value
Fixed maturity securities - available for sale
U.S. Treasury securities and obligations of
U.S. government agencies and corporations			$	1,045					$	—					$	3					$	(52)					$	996
Obligations of U.S. states and political subdivisions			138						—						1						(11)						128
Corporate securities			7,587						(47)						135						(322)						7,353
Asset-backed securities			5,644						—						25						(51)						5,618
Mortgage-backed securities
Commercial			1,091						—						1						(92)						1,000
Agency residential			4,869						—						55						(229)						4,695
Non-agency residential			431						—						14						(2)						443
Foreign government securities			2,042						—						33						(108)						1,967
Foreign corporate securities			5,720						(1)						92						(271)						5,540
Total fixed maturity securities - available for sale			$	28,568					$	(48)					$	358					$	(1,137)					$	27,740

(Some amounts may not reconcile due to rounding.)

The following tables show amortized cost, allowance for credit losses, gross URA(D) and fair value of fixed maturity securities - held to maturity for the periods indicated:

			At December 31, 2024
(Dollars in millions)			Amortized Cost						Allowance for Credit Losses						Unrealized Appreciation						Unrealized Depreciation						Fair Value
Fixed maturity securities - held to maturity
Corporate securities			$	177					$	(2)					$	5					$	(4)					$	175
Asset-backed securities			484						(4)						5						(8)						477
Mortgage-backed securities
Commercial			21						—						—						—						21
Foreign corporate securities			84						(1)						4						—						86
Total fixed maturity securities - held to maturity			$	765					$	(8)					$	14					$	(12)					$	759

(Some amounts may not reconcile due to rounding.)

			At December 31, 2023
(Dollars in millions)			Amortized Cost						Allowance for Credit Losses						Unrealized Appreciation						Unrealized Depreciation						Fair Value
Fixed maturity securities - held to maturity
Corporate securities			$	150					$	(2)					$	1					$	(3)					$	146
Asset-backed securities			609						(5)						4						(10)						597
Mortgage-backed securities
Commercial			21						—						—						—						21
Foreign corporate securities			84						(1)						7						—						90
Total fixed maturity securities - held to maturity			$	864					$	(8)					$	12					$	(13)					$	854

(Some amounts may not reconcile due to rounding.)

Schedule of Amortized Cost and Fair Value of Fixed Maturity Securities, by Contractual Maturity

The amortized cost and fair value of fixed maturity securities - available for sale are shown in the following table by contractual maturity. As the stated maturity of such securities may not be indicative of actual maturities, the totals for mortgage-backed and asset-backed securities are shown separately.

			At December 31, 2024												At December 31, 2023
(Dollars in millions)			Amortized Cost						Fair Value						Amortized Cost						Fair Value
Fixed maturity securities - available for sale
Due in one year or less			$	1,116					$	1,080					$	1,289					$	1,261
Due after one year through five years			8,774						8,480						7,094						6,858
Due after five years through ten years			4,764						4,523						5,613						5,405
Due after ten years			1,826						1,723						2,537						2,460
Asset-backed securities			5,994						5,982						5,644						5,618
Mortgage-backed securities
Commercial			965						900						1,091						1,000
Agency residential			5,205						4,931						4,869						4,695
Non-agency residential			1,291						1,289						431						443
Total fixed maturity securities -available for sale			$	29,934					$	28,908					$	28,568					$	27,740

(Some amounts may not reconcile due to rounding.)

The amortized cost and fair value of fixed maturity securities - held to maturity are shown in the following table by contractual maturity. As the stated maturity of such securities may not be indicative of actual maturities, the totals for mortgage-backed and asset-backed securities are shown separately.

			At December 31, 2024												At December 31, 2023
(Dollars in millions)			Amortized Cost						Fair Value						Amortized Cost						Fair Value
Fixed maturity securities - held to maturity
Due in one year or less			$	7					$	7					$	5					$	5
Due after one year through five years			67						67						59						58
Due after five years through ten years			37						35						43						42
Due after ten years			150						152						127						131
Asset-backed securities			484						477						609						597
Mortgage-backed securities
Commercial			21						21						21						21
Total fixed maturity securities - held to maturity			$	765					$	759					$	864					$	854

(Some amounts may not reconcile due to rounding.)

Schedule of Changes in Net Unrealized Appreciation (Depreciation) for Company's Investments

The changes in net URA(D) for the Company’s investments are as follows:

			Years Ended December 31,
(Dollars in millions)			2024						2023
Increase (decrease) during the period between the fair value and cost
of investments carried at fair value, and deferred taxes thereon:
Fixed maturity securities - available for sale and short-term investments			$	(203)					$	1,129
Equity method investments			18						—
Change in URA(D), pre-tax			(185)						1,129
Deferred tax benefit (expense)			76						(142)
Change in URA(D), net of deferred taxes, included in shareholders’ equity			$	(109)					$	986

(Some amounts may not reconcile due to rounding.)

Schedule of Aggregate Fair Value and Gross Unrealized Depreciation of Fixed Maturity Securities by Security Type

The tables below display the aggregate fair value and gross unrealized depreciation of fixed maturity securities - available for sale by security type and contractual maturity, in each case subdivided according to length of time that the individual securities had been in a continuous unrealized loss position for the periods indicated:

			Duration of Unrealized Loss at December 31, 2024 by Security Type
			Less than 12 months												Greater than 12 months												Total
(Dollars in millions)			Fair Value						Gross Unrealized Depreciation						Fair Value						Gross Unrealized Depreciation						Fair Value						Gross Unrealized Depreciation
Fixed maturity securities - available for sale
U.S. Treasury securities and obligations of
U.S. government agencies and corporations			$	80					$	(1)					$	398					$	(23)					$	478					$	(24)
Obligations of U.S. states and political subdivisions			9						—						40						(5)						48						(5)
Corporate securities			2,744						(76)						2,132						(221)						4,876						(297)
Asset-backed securities			958						(20)						537						(19)						1,495						(39)
Mortgage-backed securities
Commercial			53						(3)						757						(63)						810						(66)
Agency residential			2,754						(115)						1,226						(172)						3,980						(287)
Non-agency residential			654						(11)						25						—						678						(11)
Foreign government securities			851						(35)						828						(112)						1,679						(147)
Foreign corporate securities			2,484						(61)						1,785						(218)						4,269						(279)
Total			$	10,587					$	(323)					$	7,728					$	(833)					$	18,315					$	(1,156)
Securities where an allowance for credit loss was recorded			17						(1)						—						—						17						(1)
Total fixed maturity securities - available for sale			$	10,604					$	(324)					$	7,728					$	(833)					$	18,332					$	(1,157)

(Some amounts may not reconcile due to rounding.)

The tables below display the aggregate fair value and gross unrealized depreciation of fixed maturity securities - available for sale by security type and contractual maturity, in each case subdivided according to length of time that the individual securities had been in a continuous unrealized loss position for the periods indicated:

			Duration of Unrealized Loss at December 31, 2023 by Security Type
			Less than 12 months												Greater than 12 months												Total
(Dollars in millions)			Fair Value						Gross Unrealized Depreciation						Fair Value						Gross Unrealized Depreciation						Fair Value						Gross Unrealized Depreciation
Fixed maturity securities - available for sale
U.S. Treasury securities and obligations of
U.S. government agencies and corporations			$	122					$	(3)					$	772					$	(49)					$	893					$	(52)
Obligations of U.S. states and political subdivisions			3						—						74						(11)						77						(11)
Corporate securities			1,019						(58)						2,780						(263)						3,799						(321)
Asset-backed securities			196						(2)						2,014						(49)						2,210						(51)
Mortgage-backed securities
Commercial			181						(19)						742						(73)						923						(92)
Agency residential			423						(4)						2,126						(225)						2,549						(229)
Non-agency residential			126						(1)						4						—						130						—
Foreign government securities			172						(7)						985						(101)						1,156						(108)
Foreign corporate securities			324						(6)						2,726						(265)						3,050						(271)
Total			$	2,564					$	(101)					$	12,222					$	(1,035)					$	14,787					$	(1,136)
Securities where an allowance for credit loss was recorded			2						(1)						—						—						2						(1)
Total fixed maturity securities - available for sale			$	2,566					$	(102)					$	12,222					$	(1,035)					$	14,789					$	(1,137)

(Some amounts may not reconcile due to rounding.)

Schedule of Aggregate Fair Value and Gross Unrealized Depreciation of Fixed Maturity Securities by Contractual Maturity

			Duration of Unrealized Loss at December 31, 2024 by Maturity
			Less than 12 months												Greater than 12 months												Total
(Dollars in millions)			Fair Value						Gross Unrealized Depreciation						Fair Value						Gross Unrealized Depreciation						Fair Value						Gross Unrealized Depreciation
Fixed maturity securities - available for sale
Due in one year or less			$	138					$	(5)					$	544					$	(34)					$	682					$	(39)
Due in one year through five years			3,503						(87)						2,770						(249)						6,273						(335)
Due in five years through ten years			1,850						(50)						1,382						(220)						3,232						(271)
Due after ten years			677						(32)						487						(76)						1,164						(107)
Asset-backed securities			958						(20)						537						(19)						1,495						(39)
Mortgage-backed securities			3,461						(129)						2,008						(235)						5,469						(364)
Total			$	10,587					$	(323)					$	7,728					$	(833)					$	18,315					$	(1,156)
Securities where an allowance for credit loss was recorded			17						(1)						—						—						17						(1)
Total fixed maturity securities - available for sale			$	10,604					$	(324)					$	7,728					$	(833)					$	18,332					$	(1,157)

(Some amounts may not reconcile due to rounding.)

			Duration of Unrealized Loss at December 31, 2023 by Maturity
			Less than 12 months												Greater than 12 months												Total
(Dollars in millions)			Fair Value						Gross Unrealized Depreciation						Fair Value						Gross Unrealized Depreciation						Fair Value						Gross Unrealized Depreciation
Fixed maturity securities - available for sale
Due in one year or less			$	184					$	(3)					$	773					$	(30)					$	958					$	(33)
Due in one year through five years			699						(18)						3,841						(271)						4,540						(289)
Due in five years through ten years			328						(15)						2,306						(310)						2,633						(325)
Due after ten years			429						(39)						417						(77)						845						(116)
Asset-backed securities			196						(2)						2,014						(49)						2,210						(51)
Mortgage-backed securities			729						(24)						2,872						(298)						3,601						(323)
Total			$	2,564					$	(101)					$	12,222					$	(1,035)					$	14,787					$	(1,136)
Securities where an allowance for credit loss was recorded			2						(1)						—						—						2						(1)
Total fixed maturity securities - available for sale			$	2,566					$	(102)					$	12,222					$	(1,035)					$	14,789					$	(1,137)

(Some amounts may not reconcile due to rounding.)

Schedule of Components of Net Investment Income

The components of net investment income are presented in the table below for the periods indicated:

			Years Ended December 31,
(Dollars in millions)			2024						2023						2022
Fixed maturities			$	1,481					$	1,153					$	742
Equity securities			3						3						16
Short-term investments and cash			195						140						28
Other invested assets
Limited partnerships			206						122						75
Other			104						59						29
Gross investment income before adjustments			1,989						1,477						890
Funds held interest income (expense)			26						10						2
Future policy benefit reserve income (expense)			(1)						(1)						—
Gross investment income			2,013						1,486						892
Investment expenses			59						53						62
Net investment income			$	1,954					$	1,434					$	830

(Some amounts may not reconcile due to rounding.)

Schedule of Components of Net Gains (Losses) on Investments

The components of net gains (losses) on investments are presented in the table below for the periods indicated:

			Years Ended December 31,
(Dollars in millions)			2024						2023						2022
Fixed maturity securities
Allowance for credit losses			$	13					$	7					$	(33)
Net realized gains (losses) from dispositions			6						(292)						(87)
Equity securities, fair value
Net realized gains (losses) from dispositions			1						8						112
Gains (losses) from fair value adjustments			(1)						—						(460)
Other invested assets			(1)						—						13
Short-term investments gain (loss)			1						—						—
Total net gains (losses) on investments			$	19					$	(276)					$	(455)

(Some amounts may not reconcile due to rounding.)

Schedule of Roll Forward of Allowance for Credit Losses of Fixed Maturities, Available for Sale

The following tables provide a roll forward of the Company’s beginning and ending balance of allowance for credit losses for the periods indicated:

			Roll Forward of Allowance for Credit Losses - Fixed Maturities - Available for Sale
			Twelve Months Ended December 31, 2024
			Corporate Securities												Foreign Corporate Securities						Total
(Dollars in millions)
Beginning balance			$	(47)											$	(1)					$	(48)
Credit losses on securities where credit losses were not previously recorded			(9)												—						(9)
Increases in allowance on previously impaired securities			—												—						—
Decreases in allowance on previously impaired securities			—												—						—
Reduction in allowance due to disposals			20												1						21
Balance, end of period			$	(35)											$	—					$	(36)

(Some amounts may not reconcile due to rounding.)

			Roll Forward of Allowance for Credit Losses - Fixed Maturities - Available for Sale
			Twelve Months Ended December 31, 2023
			Corporate Securities												Foreign Corporate Securities						Total
(Dollars in millions)
Beginning balance			$	(45)											$	(10)					$	(54)
Credit losses on securities where credit losses were not previously recorded			(23)												—						(24)
Increases in allowance on previously impaired securities			(1)												—						(1)
Decreases in allowance on previously impaired securities			—												—						—
Reduction in allowance due to disposals			22												8						30
Balance, end of period			$	(47)											$	(1)					$	(48)

(Some amounts may not reconcile due to rounding.)

Schedule of Roll Forward of Allowance for Credit Losses of Fixed Maturities, Held to Maturity

			Roll Forward of Allowance for Credit Losses - Fixed Maturities - Held to Maturity
			Twelve Months Ended December 31, 2024
			Corporate Securities						Asset-Backed Securities												Foreign Corporate Securities						Total
(Dollars in millions)
Beginning balance			$	(2)					$	(5)											$	(1)					$	(8)
Credit losses on securities where credit losses were not previously recorded			—						—												(1)						(1)
Increases in allowance on previously impaired securities			—						—												—						—
Decreases in allowance on previously impaired securities			—						—												—						—
Reduction in allowance due to disposals			—						1												—						1
Balance, end of period			$	(2)					$	(4)											$	(1)					$	(8)

(Some amounts may not reconcile due to rounding.)

			Roll Forward of Allowance for Credit Losses - Fixed Maturities - Held to Maturity
			Twelve Months Ended December 31, 2023
			Corporate Securities						Asset-Backed Securities						Foreign Corporate Securities						Total
(Dollars in millions)
Beginning balance			$	(2)					$	(6)					$	(1)					$	(9)
Credit losses on securities where credit losses were not previously recorded			—						—						—						—
Increases in allowance on previously impaired securities			—						—						—						—
Decreases in allowance on previously impaired securities
Reduction in allowance due to disposals			—						1						—						1
Balance, end of period			$	(2)					$	(5)					$	(1)					$	(8)

(Some amounts may not reconcile due to rounding.)

Schedule of Proceeds and Split Between Gross Gains and Losses, from Sales of Fixed Maturity Securities

The proceeds and split between gross gains and losses, from sales of fixed maturity securities - available for sale and equity securities, are presented in the table below for the periods indicated:

			Years Ended December 31,
(Dollars in millions)			2024						2023						2022
Proceeds from sales of fixed maturity securities - available for sale			$	6,257					$	3,849					$	1,403
Gross gains from sales			166						35						40
Gross losses from sales			(160)						(327)						(127)
Proceeds from sales of equity securities			$	37					$	126					$	2,217
Gross gains from sales			2						8						165
Gross losses from sales			(1)						—						(53)

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