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INVESTMENTS (Tables)

9 Months Ended

Sep. 30, 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 September 30, 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			$	742					$	—					$	2					$	(35)					709
Obligations of U.S. states and political subdivisions			87						—						1						(4)						84
Corporate Securities			8,257						(50)						203						(215)						8,195
Asset-backed Securities			5,900						—						35						(20)						5,915
Mortgage-backed securities
Commercial			990						—						4						(56)						937
Agency Residential			4,662						—						67						(173)						4,556
Non-agency Residential			1,325						—						34						—						1,359
Foreign government securities			2,388						—						46						(96)						2,338
Foreign corporate securities			6,401						—						178						(193)						6,386
Total fixed maturity securities - available for sale			$	30,753					$	(51)					$	570					$	(793)					$	30,479

(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 September 30, 2024
(Dollars in millions)			Amortized Cost						Allowance for Credit Losses						Unrealized Appreciation						Unrealized Depreciation						Fair Value
Fixed maturity securities - held to maturity
Corporate Securities			$	182					$	(2)					$	8					$	(1)					$	187
Asset-backed Securities			501						(5)						8						(4)						501
Mortgage-backed securities
Commercial			21						—						—						—						21
Foreign corporate securities			84						(1)						9						—						91
Total fixed maturity securities - held to maturity			$	788					(8)						$	24					$	(5)					$	799

(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 September 30, 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			$	1,047					$	1,014					$	1,289					$	1,261
Due after one year through five years			8,742						8,686						7,094						6,858
Due after five years through ten years			5,907						5,865						5,613						5,405
Due after ten years			2,180						2,146						2,537						2,460
Asset-backed securities			5,900						5,915						5,644						5,618
Mortgage-backed securities
Commercial			990						937						1,091						1,000
Agency residential			4,662						4,556						4,869						4,695
Non-agency residential			1,325						1,359						431						443
Total fixed maturity securities - available for sale			$	30,753					$	30,479					$	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 September 30, 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			$	12					$	12					$	5					$	5
Due after one year through five years			67						68						59						58
Due after five years through ten years			37						37						43						42
Due after ten years			150						161						127						131
Asset-backed securities			501						501						609						597
Mortgage-backed securities
Commercial			21						21						21						21
Total fixed maturity securities - held to maturity			$	788					$	799					$	864					$	854

(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)			2024						2023						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			$	840					$	(264)					$	563					$	(180)
Equity method securities			18						—						18						—
Change in URA(D), pre-tax			857						(264)						581						(180)
Deferred tax benefit (expense)			(123)						22						(60)						20
Change in URA(D), net of deferred taxes, included in shareholders’ equity			$	734					$	(242)					$	521					$	(159)

(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, 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			$	161					$	(8)					$	464					$	(27)					$	625					$	(35)
Obligations of U.S. states and political subdivisions			1						—						41						(4)						42						(4)
Corporate securities			761						(21)						2,322						(193)						3,083						(214)
Asset-backed securities			268						(2)						565						(18)						833						(20)
Mortgage-backed securities
Commercial			155						(11)						679						(45)						834						(56)
Agency residential			645						(49)						1,377						(124)						2,022						(173)
Non-agency residential			37						—						25						—						63						—
Foreign government securities			219						(10)						858						(86)						1,076						(96)
Foreign corporate securities			406						(10)						1,994						(183)						2,400						(193)
Total			$	2,654					$	(111)					$	8,324					$	(681)					$	10,978					$	(792)
Securities where an allowance for credit loss was recorded			1						—						—						(1)						1						(1)
Total fixed maturity securities - available for sale			$	2,655					$	(111)					$	8,324					$	(682)					$	10,979					$	(793)

(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, 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 September 30, 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			$	205					$	(7)					$	520					$	(28)					$	725					$	(35)
Due in one year through five years			985						(27)						2,946						(190)						3,931						(217)
Due in five years through ten years			235						(12)						1,651						(206)						1,885						(218)
Due after ten years			124						(2)						562						(69)						686						(72)
Asset-backed securities			268						(2)						565						(18)						833						(20)
Mortgage-backed securities			838						(61)						2,081						(169)						2,919						(230)
Total			$	2,654					$	(111)					$	8,324					$	(681)					$	10,978					$	(792)
Securities where an allowance for credit loss was recorded			1						—						—						(1)						1						(1)
Total fixed maturity securities - available for sale			$	2,655					$	(111)					$	8,324					$	(682)					$	10,979					$	(793)

(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:

			Three Months Ended September 30,												Nine Months Ended September 30,
(Dollars in millions)			2024						2023						2024						2023
Fixed maturities			$	378					$	299					$	1,099					$	822
Equity securities			1						1						3						3
Short-term investments and cash			54						41						135						92
Other invested assets
Limited partnerships			36						60						183						98
Other			36						15						85						42
Gross investment income before adjustments			504						416						1,506						1,056
Funds held interest income (expense)			5						5						20						7
Future policy benefit reserve income (expense)			1						—						—						(1)
Gross investment income			510						420						1,525						1,063
Investment expenses			13						14						44						41
Net investment income			$	496					$	406					$	1,481					$	1,023

(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)			2024						2023						2024						2023
Fixed maturity securities
Allowance for credit losses			$	(9)					$	2					$	(3)					$	(6)
Net realized gains (losses) from dispositions			(25)						(19)						(47)						(21)
Equity securities, fair value
Net realized gains (losses) from dispositions			—						1						1						8
Gains (losses) from fair value adjustments			5						(16)						(3)						(3)
Other invested assets			1						—						—						—
Total net gains (losses) on investments			$	(27)					$	(31)					$	(50)					$	(21)

(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, 2024																		Nine Months Ended September 30, 2024
(Dollars in millions)			Corporate Securities																		Foreign Corporate Securities						Total						Corporate 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.)

			Roll Forward of Allowance for Credit Losses - Fixed Maturities - Available for Sale
			Three Months Ended September 30, 2023																								Nine Months Ended September 30, 2023
(Dollars in millions)			Corporate Securities						Municipals						Foreign Corporate Securities						Total						Corporate Securities						Municipals						Foreign Corporate Securities						Total
Beginning balance			$	(56)					$	—					$	(7)					$	(63)					$	(45)					$	—					$	(10)					$	(54)
Credit losses on securities where credit
losses were not previously recorded			(3)						—						—						(3)						(17)						—						—						(17)
Increases in allowance on previously
impaired securities			—						—						—						—						—						—						—						—
Decreases in allowance on previously
impaired securities			—						—						—						—						—						—						—						—
Reduction in allowance due to disposals			2						—						4						6						6						—						6						12
Balance, end of period			$	(57)					(1)						$	(3)					$	(60)					$	(57)					$	(1)					$	(3)					$	(60)

(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, 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.)

			Roll Forward of Allowance for Credit Losses - Fixed Maturities - Held to Maturity
			Three Months Ended September 30, 2023																								Nine Months Ended September 30, 2023
(Dollars in millions)			Corporate Securities						Asset-Backed Securities						Foreign Corporate Securities						Total						Corporate Securities						Asset-Backed Securities						Foreign Corporate Securities						Total
Beginning balance			$	(2)					$	(6)					$	(1)					(8)						$	(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			—						—						—						—						—						—						—						—
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 dispositions of fixed maturity securities - available for sale 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)			2024						2023						2024						2023
Proceeds from sales of fixed maturity securities - available for sale			$	3,237					$	300					$	4,322					$	468
Gross gains from dispositions			59						4						86						21
Gross losses from dispositions			(84)						(23)						(133)						(42)
Proceeds from sales of equity securities			$	—					$	80					$	15					$	126
Gross gains from dispositions			—						2						2						8
Gross losses from dispositions			—						—						—						—

(Some amounts may not reconcile due to rounding.)

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Unrealized Appreciation Depreciation Of Investments [Table Text Block]

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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
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- 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
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aa)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aaa)
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