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INVESTMENTS (Tables)

9 Months Ended

Sep. 30, 2025

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 September 30, 2025
(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			$	770					$	—					$	4					$	(22)					752
Obligations of U.S. states and political subdivisions			55						—						—						(6)						49
Corporate securities			9,734						(38)						199						(189)						9,705
Asset-backed securities			5,049						(14)						23						(15)						5,044
Mortgage-backed securities
Agency commercial			402						—						9						(1)						409
Non-agency commercial			907						—						4						(39)						872
Agency residential			5,594						—						68						(178)						5,484
Non-agency residential			1,562						—						35						(1)						1,595
Foreign government securities			2,534						—						35						(100)						2,470
Foreign corporate securities			7,443						—						245						(157)						7,531
Total fixed maturity securities - available for sale			$	34,049					$	(51)					$	621					$	(708)					$	33,912

(Some amounts may not reconcile due to rounding.)

			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.)

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 September 30, 2025
(Dollars in millions)			Amortized Cost						Allowance for Credit Losses						Unrealized Appreciation						Unrealized Depreciation						Fair Value
Fixed maturity securities - held to maturity
Corporate securities			$	167					$	(2)					$	7					$	(1)					$	170
Asset-backed securities			364						(3)						6						(8)						358
Mortgage-backed securities
Commercial			1						—						—						—						1
Foreign corporate securities			79						(1)						6						—						84
Total fixed maturity securities - held to maturity			$	610					(6)						$	19					$	(10)					$	613

(Some amounts may not reconcile due to rounding.)

			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.)

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 September 30, 2025												At December 31, 2024
(Dollars in millions)			Amortized Cost						Fair Value						Amortized Cost						Fair Value
Fixed maturity securities – available for sale
Due in one year or less			$	1,423					$	1,390					$	1,116					$	1,080
Due after one year through five years			10,521						10,558						8,774						8,480
Due after five years through ten years			6,666						6,701						4,764						4,523
Due after ten years			1,926						1,860						1,826						1,723
Asset-backed securities			5,049						5,044						5,994						5,982
Mortgage-backed securities
Agency commercial			402						409						—						—
Non-agency commercial			907						872						965						900
Agency residential			5,594						5,484						5,205						4,931
Non-agency residential			1,562						1,595						1,291						1,289
Total fixed maturity securities - available for sale			$	34,049					$	33,912					$	29,934					$	28,908

(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 September 30, 2025												At December 31, 2024
(Dollars in millions)			Amortized Cost						Fair Value						Amortized Cost						Fair Value
Fixed maturity securities – held to maturity
Due in one year or less			$	5					$	5					$	7					$	7
Due after one year through five years			88						89						67						67
Due after five years through ten years			4						4						37						35
Due after ten years			149						156						150						152
Asset-backed securities			364						358						484						477
Mortgage-backed securities
Commercial			1						1						21						21
Total fixed maturity securities - held to maturity			$	610					$	613					$	765					$	759

(Some amounts may not reconcile due to rounding.)

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

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

			Three Months Ended September 30,												Nine Months Ended September 30,
(Dollars in millions)			2025						2024						2025						2024
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, held to maturity and short-term investments			$	202					$	840					$	909					$	563
Equity method investments			—						18						—						18
Change in URA(D), pre-tax			202						857						909						581
Deferred tax benefit (expense)			(36)						(123)						(147)						(60)
Change in URA(D), net of deferred taxes, included in shareholders’ equity			$	165					$	734					$	762					$	521

(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 September 30, 2025 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			$	162					$	(4)					$	363					$	(19)					$	524					$	(22)
Obligations of U.S. states and political subdivisions			8						—						36						(5)						44						(6)
Corporate securities			1,345						(35)						1,926						(154)						3,271						(189)
Asset-backed securities			440						(6)						281						(9)						721						(15)
Mortgage-backed securities
Agency commercial			88						—						17						(1)						105						(1)
Non-agency commercial			86						(5)						678						(34)						764						(39)
Agency residential			454						(5)						1,683						(173)						2,138						(178)
Non-agency residential			154						(1)						19						—						173						(1)
Foreign government securities			691						(14)						720						(86)						1,411						(100)
Foreign corporate securities			1,026						(24)						1,540						(133)						2,566						(157)
Total			$	4,453					$	(94)					$	7,264					$	(613)					$	11,717					$	(707)
Securities where an allowance for credit loss was recorded			2						—						15						—						17						(1)
Total fixed maturity securities - available for sale			$	4,455					$	(94)					$	7,279					$	(614)					$	11,734					$	(708)

(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 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.)

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

			Duration of Unrealized Loss at September 30, 2025 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			$	195					$	(6)					$	617					$	(27)					$	812					$	(33)
Due in one year through five years			1,471						(37)						2,426						(178)						3,898						(215)
Due in five years through ten years			889						(12)						1,064						(128)						1,953						(140)
Due after ten years			675						(21)						478						(64)						1,154						(85)
Asset-backed securities			440						(6)						281						(9)						721						(15)
Mortgage-backed securities			782						(11)						2,398						(208)						3,179						(219)
Total			$	4,453					$	(94)					$	7,264					$	(613)					$	11,717					$	(707)
Securities where an allowance for credit loss was recorded			2						—						15						—						17						(1)
Total fixed maturity securities - available for sale			$	4,455					$	(94)					$	7,279					$	(614)					$	11,734					$	(708)

(Some amounts may not reconcile due to rounding.)

			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.)

Schedule of Components of Net Investment Income

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

			Three Months Ended September 30,												Nine Months Ended September 30,
(Dollars in millions)			2025						2024						2025						2024
Fixed maturities			$	390					$	378					$	1,172					$	1,099
Equity securities			1						1						3						3
Short-term investments and cash			43						54						125						135
Other invested assets
Limited partnerships			76						36						189						183
Other			36						36						87						85
Gross investment income before adjustments			546						504						1,577						1,506
Funds held interest income (expense)			7						5						22						20
Future policy benefit reserve income (expense)			—						1						—						—
Gross investment income			553						510						1,598						1,525
Investment expenses			13						13						35						44
Net investment income			$	540					$	496					$	1,563					$	1,481

(Some amounts may not reconcile due to rounding.)

Schedule of Components of Net Realized Capital Gains (Losses)

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

			Three Months Ended September 30,												Nine Months Ended September 30,
(Dollars in millions)			2025						2024						2025						2024
Fixed maturity securities
Allowance for credit losses			$	(12)					$	(9)					$	(14)					$	(3)
Net realized gains (losses) from dispositions			(36)						(25)						(48)						(47)
Equity securities, fair value
Net realized gains (losses) from dispositions			—						—						(1)						1
Gains (losses) from fair value adjustments			—						5						3						(3)
Other invested assets			—						1						—						—
Short-term investments gain (loss)			—						1						—						1
Total net gains (losses) on investments			$	(47)					$	(27)					$	(59)					$	(50)

(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
			Three Months Ended September 30, 2025																								Nine Months Ended September 30, 2025
(Dollars in millions)			Corporate Securities						Asset-Backed Securities												Foreign Corporate Securities						Total						Corporate Securities						Asset-Backed Securities												Foreign Corporate Securities						Total
Beginning balance			$	(39)					$	—											$	—					$	(40)					$	(35)					$	—											$	—					$	(36)
Credit losses on securities where credit
losses were not previously recorded			(17)						(14)												—						(30)						(21)						(14)												—						(34)
Increases in allowance on previously
impaired securities			(6)						—												—						(6)						(6)						—												—						(6)
Decreases in allowance on previously
impaired securities			—						—												—						—						—						—												—						—
Reduction in allowance due to disposals			25						—												—						25						25						—												—						25
Balance, end of period			$	(38)					$	(14)											$	—					$	(51)					$	(38)					$	(14)											$	—					$	(51)

(Some amounts may not reconcile due to rounding.)

			Roll Forward of Allowance for Credit Losses - Fixed Maturities - Available for Sale
			Three Months Ended September 30, 2024																								Nine Months Ended September 30, 2024
(Dollars in millions)			Corporate Securities						Asset-Backed Securities												Foreign Corporate Securities						Total						Corporate Securities						Asset-Backed Securities												Foreign Corporate Securities						Total
Beginning balance			$	(42)					$	—											$	—					$	(42)					$	(47)					$	—											$	(1)					$	(48)
Credit losses on securities where credit
losses were not previously recorded			(9)						—												—						(9)						(9)						—												—						(9)
Increases in allowance on previously
impaired securities			—						—												—						—						—						—												—						—
Decreases in allowance on previously
impaired securities			—						—												—						—						—						—												—						—
Reduction in allowance due to disposals			—						—												—						—						5						—												1						6
Balance, end of period			$	(50)					$	—											$	—					$	(51)					$	(50)					$	—											$	—					$	(51)

(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
			Three Months Ended September 30, 2025																								Nine Months Ended September 30, 2025
(Dollars in millions)			Corporate Securities						Asset-Backed Securities						Foreign Corporate Securities						Total						Corporate Securities						Asset-Backed Securities						Foreign Corporate Securities						Total
Beginning balance			$	(2)					$	(4)					$	(1)					$	(7)					$	(2)					$	(4)					$	(1)					$	(8)
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						2
Balance, end of period			$	(2)					$	(3)					$	(1)					$	(6)					$	(2)					$	(3)					$	(1)					$	(6)

(Some amounts may not reconcile due to rounding.)

			Roll Forward of Allowance for Credit Losses - Fixed Maturities - Held to Maturity
			Three Months Ended September 30, 2024																								Nine Months Ended September 30, 2024
(Dollars in millions)			Corporate Securities						Asset-Backed Securities						Foreign Corporate Securities						Total						Corporate Securities						Asset-Backed Securities						Foreign Corporate Securities						Total
Beginning balance			$	(2)					$	(5)					$	(1)					(8)						$	(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)						(5)						$	(1)					$	(8)					$	(2)					$	(5)					$	(1)					$	(8)

(Some amounts may not reconcile due to rounding.)

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

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

			Three Months Ended September 30,												Nine Months Ended September 30,
(Dollars in millions)			2025						2024						2025						2024
Proceeds from sales of fixed maturity securities - available for sale			$	653					$	3,237					$	933					$	4,322
Gross gains from sales			34						59						43						86
Gross losses from sales			(69)						(84)						(91)						(133)
Proceeds from sales of fixed maturity securities - held to maturity			$	—					$	—					$	10					$	—
Gross gains from sales			—						—						—						—
Gross losses from sales			—						—						(1)						—
Proceeds from sales of equity securities			$	1					$	—					$	55					$	15
Gross gains from sales			—						—						—						2
Gross losses from sales			—						—						(1)						—

(Some amounts may not reconcile due to rounding.)

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- Definition

Unrealized Appreciation Depreciation Of Investments [Table Text Block]

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No definition available.

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- Definition

Tabular disclosure of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479106/326-30-50-9

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X

- Definition

Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-9

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
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