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INVESTMENTS (Tables)

6 Months Ended

Jun. 30, 2023

Investments, Debt and Equity Securities [Abstract]

Summary 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) and fair value of fixed maturity securities - available for sale for the periods indicated:

			At June 30, 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			$	1,225					$	—					$	2					$	(82)					$	1,145
Obligations of U.S. states and political subdivisions			424						—						1						(30)						395
Corporate Securities			7,639						(56)						27						(553)						7,057
Asset-backed Securities			4,973						—						6						(117)						4,862
Mortgage-backed securities
Commercial			1,085						—						—						(113)						972
Agency Residential			3,673						—						6						(292)						3,387
Non-agency Residential			62						—						—						(1)						61
Foreign government securities			1,755						—						7						(165)						1,597
Foreign corporate securities			5,536						(7)						14						(530)						5,013
Total fixed maturity securities - available for sale			$	26,372					$	(63)					$	63					$	(1,883)					$	24,489

(Some amounts may not reconcile due to rounding.)

			At December 31, 2022
(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			$	1,334					$	—					$	6					$	(82)					$	1,257
Obligations of U.S. states and political subdivisions			444						—						2						(32)						413
Corporate securities			7,044						(45)						31						(561)						6,469
Asset-backed securities			4,229						—						5						(171)						4,063
Mortgage-backed securities
Commercial			1,023						—						—						(105)						919
Agency residential			3,382						—						7						(290)						3,099
Non-agency residential			5						—						—						(1)						4
Foreign government securities			1,586						—						8						(179)						1,415
Foreign corporate securities			5,143						(10)						23						(562)						4,596
Total fixed maturity securities - available for sale			$	24,191					$	(54)					$	81					$	(1,982)					$	22,236

(Some amounts may not reconcile due to rounding.)

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

			At June 30, 2023
(Dollars in millions)			Amortized Cost						Allowance for Credit Losses						Unrealized Appreciation						Unrealized Depreciation						Fair Value
Fixed maturity securities - held to maturity
Corporate Securities			$	152					$	(2)					$	—					$	(6)					$	144
Asset-backed Securities			612						(5)						2						(15)						595
Mortgage-backed securities
Commercial			14						—						—						—						14
Foreign corporate securities			28						(1)						2						—						29
Total fixed maturity securities - held to maturity			$	806					(8)						$	4					$	(21)					$	781

(Some amounts may not reconcile due to rounding.)

			At December 31, 2022
(Dollars in millions)			Amortized Cost						Allowance for Credit Losses						Unrealized Appreciation						Unrealized Depreciation						Fair Value
Fixed maturity securities - held to maturity
Corporate Securities			$	152					$	(2)					$	—					$	(6)					$	144
Asset-backed Securities			661						(6)						2						(15)						642
Mortgage-backed securities
Commercial			7						—						—						—						7
Foreign corporate securities			28						(1)						2						—						28
Total fixed maturity securities - held to maturity			$	848					$	(9)					$	3					$	(22)					$	821

(Some amounts may not reconcile due to rounding.)

Summary 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 June 30, 2023												At December 31, 2022
(Dollars in millions)			Amortized Cost						Fair Value						Amortized Cost						Fair Value
Fixed maturity securities – available for sale
Due in one year or less			$	1,695					$	1,642					$	1,331					$	1,314
Due after one year through five years			8,423						7,842						8,131						7,546
Due after five years through ten years			4,572						4,045						4,636						4,057
Due after ten years			1,889						1,678						1,454						1,233
Asset-backed securities			4,973						4,862						4,229						4,063
Mortgage-backed securities
Commercial			1,085						972						1,023						919
Agency residential			3,673						3,387						3,382						3,099
Non-agency residential			62						61						5						4
Total fixed maturity securities - available for sale			$	26,372					$	24,489					$	24,191					$	22,236

(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 June 30, 2023												At December 31, 2022
(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					$	5					$	5
Due after one year through five years			64						61						63						61
Due after five years through ten years			44						41						43						41
Due after ten years			68						65						68						65
Asset-backed securities			613						595						661						642
Mortgage-backed securities
Commercial			14						14						7						7
Total fixed maturity securities - held to maturity			$	806					$	781					$	848					$	821

(Some amounts may not reconcile due to rounding.)

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

The changes in net unrealized appreciation (depreciation) for the Company’s investments are as follows:

			Three Months Ended June 30,												Six Months Ended June 30,
(Dollars in millions)			2023						2022						2023						2022
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			$	(195)					$	(832)					$	84					$	(1,760)
Change in unrealized appreciation (depreciation), pre-tax			(195)						(832)						84						(1,760)
Deferred tax benefit (expense)			28						116						(2)						232
Change in unrealized appreciation (depreciation), net of deferred taxes, included in shareholders’ equity			$	(167)					$	(717)					$	82					$	(1,528)

(Some amounts may not reconcile due to rounding.)

Summary of Aggregate Market Value and Gross Unrealized Depreciation of Fixed Maturity and Equity 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 individual securities had been in a continuous unrealized loss position for the periods indicated:

			Duration of Unrealized Loss at June 30, 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			$	198					$	(12)					$	877					$	(70)					$	1,075					$	(82)
Obligations of U.S. states and political subdivisions			77						(1)						199						(29)						276						(30)
Corporate securities			1,877						(114)						3,982						(438)						5,859						(553)
Asset-backed securities			1,120						(24)						2,490						(93)						3,610						(117)
Mortgage-backed securities
Commercial			87						(2)						873						(110)						961						(113)
Agency residential			1,067						(33)						1,948						(259)						3,015						(292)
Non-agency residential			57						(1)						4						—						61						(1)
Foreign government securities			353						(13)						1,043						(152)						1,396						(165)
Foreign corporate securities			1,169						(50)						3,317						(479)						4,486						(530)
Total			$	6,004					$	(250)					$	14,734					$	(1,630)					$	20,738					$	(1,881)
Securities where an allowance for credit loss was recorded			2						(2)						—						(1)						3						(2)
Total fixed maturity securities - available for sale			$	6,007					$	(252)					$	14,734					$	(1,631)					$	20,741					$	(1,883)

(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, 2022 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			$	668					$	(31)					$	487					$	(52)					$	1,155					$	(82)
Obligations of U.S. states and political subdivisions			235						(23)						27						(9)						261						(32)
Corporate securities			4,143						(326)						1,316						(234)						5,459						(561)
Asset-backed securities			3,204						(142)						456						(29)						3,661						(171)
Mortgage-backed securities
Commercial			806						(90)						101						(15)						907						(105)
Agency residential			1,905						(132)						870						(158)						2,776						(289)
Non-agency residential			4						—						1						(1)						4						—
Foreign government securities			985						(100)						321						(79)						1,306						(179)
Foreign corporate securities			3,264						(372)						853						(189)						4,117						(561)
Total			$	15,213					$	(1,217)					$	4,432					$	(764)					$	19,645					$	(1,982)
Securities where an allowance for credit loss was recorded			2						—						—						—						2						—
Total fixed maturity securities - available for sale			$	15,215					$	(1,217)					$	4,432					$	(764)					$	19,647					$	(1,982)

(Some amounts may not reconcile due to rounding.)

Summary of Aggregate Market Value and Gross Unrealized Depreciation of Fixed Maturity and Equity Securities, by Contractual Maturity

			Duration of Unrealized Loss at June 30, 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			$	404					$	(9)					$	1,007					$	(36)					$	1,411					$	(44)
Due in one year through five years			1,718						(66)						5,193						(521)						6,912						(587)
Due in five years through ten years			982						(50)						2,639						(482)						3,622						(532)
Due after ten years			569						(65)						578						(128)						1,147						(193)
Asset-backed securities			1,120						(24)						2,490						(93)						3,610						(117)
Mortgage-backed securities			1,211						(36)						2,825						(370)						4,036						(406)
Total			$	6,004					$	(250)					$	14,734					$	(1,630)					$	20,738					$	(1,881)
Securities where an allowance for credit loss was recorded			2						(2)						—						(1)						3						(2)
Total fixed maturity securities - available for sale			$	6,007					$	(252)					$	14,734					$	(1,631)					$	20,741					$	(1,883)

(Some amounts may not reconcile due to rounding.)

			Duration of Unrealized Loss at December 31, 2022 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			$	989					$	(19)					$	40					$	(7)					$	1,029					$	(26)
Due in one year through five years			4,935						(383)						1,645						(209)						6,580						(592)
Due in five years through ten years			2,698						(360)						911						(230)						3,609						(590)
Due after ten years			672						(91)						408						(116)						1,080						(207)
Asset-backed securities			3,204						(142)						456						(29)						3,661						(171)
Mortgage-backed securities			2,715						(222)						972						(173)						3,687						(395)
Total			$	15,213					$	(1,217)					$	4,432					$	(764)					$	19,645					$	(1,982)
Securities where an allowance for credit loss was recorded			2						—						—						—						2						—
Total fixed maturity securities - available for sale			$	15,215					$	(1,217)					$	4,432					$	(764)					$	19,647					$	(1,982)

(Some amounts may not reconcile due to rounding.)

Summary 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 June 30,												Six Months Ended June 30,
(Dollars in millions)			2023						2022						2023						2022
Fixed maturities			$	276					$	169					$	523					$	317
Equity securities			1						5						2						9
Short-term investments and cash			34						7						51						7
Other invested assets
Limited partnerships			53						48						38						136
Other			6						14						27						26
Gross investment income before adjustments			369						242						641						494
Funds held interest income (expense)			2						1						2						4
Future policy benefit reserve income (expense)			—						—						—						—
Gross investment income			371						242						643						498
Investment expenses			14						16						26						30
Net investment income			$	357					$	226					$	617					$	469

(Some amounts may not reconcile due to rounding.)

Summary 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 June 30,												Six Months Ended June 30,
(Dollars in millions)			2023						2022						2023						2022
Fixed maturity securities
Allowance for credit losses			$	—					$	(1)					$	(8)					$	(13)
Net realized gains (losses) from dispositions			(3)						(16)						(1)						(13)
Equity securities, fair value
Net realized gains (losses) from dispositions			—						(31)						7						(43)
Gains (losses) from fair value adjustments			8						(189)						12						(326)
Other invested assets			—						1						—						5
Total net gains (losses) on investments			$	5					$	(236)					$	10					$	(390)

(Some amounts may not reconcile due to rounding.)

Debt Securities, Available-for-Sale, Allowance for Credit Loss

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 June 30, 2023																								Six Months Ended June 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			$	(55)					$	—					$	(7)					$	(62)					$	(45)					$	—					$	(10)					$	(54)
Credit losses on securities where credit losses were not previously recorded			(2)						—						—						(2)						(14)						—						—						(14)
Increases in allowance on previously impaired securities			—						—						—						—						—						—						—						—
Decreases in allowance on previously impaired securities			—						—						—						—						—						—						—						—
Reduction in allowance due to disposals			1						—						—						1						4						—						3						6
Balance, end of period			$	(56)					$	—					$	(7)					$	(63)					$	(56)					$	—					$	(7)					$	(63)

(Some amounts may not reconcile due to rounding.)

			Roll Forward of Allowance for Credit Losses - Fixed Maturities - Available for Sale
			Three Months Ended June 30, 2022																								Six Months Ended June 30, 2022
(Dollars in millions)			Corporate Securities						Asset-Backed Securities						Foreign Corporate Securities						Total						Corporate Securities						Asset-Backed Securities						Foreign Corporate Securities						Total
Beginning balance			$	(20)					$	(8)					$	(14)					$	(42)					$	(19)					$	(8)					$	(3)					$	(30)
Credit losses on securities where credit losses were not previously recorded			(5)						—						(5)						(10)						(7)						—						(16)						(23)
Increases in allowance on previously impaired securities			(1)						—						(1)						(1)						(1)						—						(1)						(1)
Decreases in allowance on previously impaired securities									—												—						—						—						—						—
Reduction in allowance due to disposals			—						8						2						10						1						8						2						11
Balance, end of period			$	(26)					—						$	(17)					$	(43)					$	(26)					$	—					$	(17)					$	(43)

(Some amounts may not reconcile due to rounding.)

Debt Securities, Held-to-Maturity, Allowance for Credit Loss

			Roll Forward of Allowance for Credit Losses - Fixed Maturities - Held to Maturity
			Three Months Ended June 30, 2023																								Six Months Ended June 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)					$	(9)					$	(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.)

Summary of Gross Gains (Losses) from Sales of Fixed Maturity and Equity Securities

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

			Three Months Ended June 30,												Six Months Ended June 30,
(Dollars in millions)			2023						2022						2023						2022
Proceeds from sales of fixed maturity securities - available for sale			$	96					$	353					$	168					$	772
Gross gains from dispositions			7						7						17						28
Gross losses from dispositions			(10)						(23)						(19)						(40)
Proceeds from sales of equity securities			$	—					$	348					$	46					$	438
Gross gains from dispositions			—						4						7						8
Gross losses from dispositions			—						(35)						—						(50)

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Unrealized Appreciation Depreciation Of Investments [Table Text Block]

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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)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-3

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

Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
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