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INVESTMENTS (Tables)

12 Months Ended

Dec. 31, 2023

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, 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.)

			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 table shows 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, 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.)

			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.)

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, 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			$	1,289					$	1,261					$	1,331					$	1,314
Due after one year through five years			7,094						6,858						8,131						7,546
Due after five years through ten years			5,613						5,405						4,636						4,057
Due after ten years			2,537						2,460						1,454						1,233
Asset-backed securities			5,644						5,618						4,229						4,063
Mortgage-backed securities
Commercial			1,091						1,000						1,023						919
Agency residential			4,869						4,695						3,382						3,099
Non-agency residential			431						443						5						4
Total fixed maturity securities -available for sale			$	28,568					$	27,740					$	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 December 31, 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			59						58						63						61
Due after five years through ten years			43						42						43						41
Due after ten years			127						131						68						65
Asset-backed securities			609						597						661						642
Mortgage-backed securities
Commercial			21						21						7						7
Total fixed maturity securities - held to maturity			$	864					$	854					$	848					$	821

(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)			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			$	1,129					$	(2,225)
Change in unrealized appreciation (depreciation), pre-tax			1,129						(2,225)
Deferred tax benefit (expense)			(142)						277
Change in URA(D), net of deferred taxes, included in shareholders’ equity			$	986					$	(1,948)

(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 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.)

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.)

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

			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.)

			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.)

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)			2023						2022						2021
Fixed maturities			$	1,153					$	742					$	561
Equity securities			3						16						17
Short-term investments and cash			140						28						1
Other invested assets
Limited partnerships			122						75						565
Other			59						29						63
Gross investment income before adjustments			1,477						890						1,208
Funds held interest income (expense)			10						2						12
Future policy benefit reserve income (expense)			(1)						—						(1)
Gross investment income			1,486						892						1,219
Investment expenses			53						62						54
Net investment income			$	1,434					$	830					$	1,165

(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)			2023						2022						2021
Fixed maturity securities
Allowance for credit losses			$	7					$	(33)					$	(28)
Net realized gains (losses) from dispositions			(292)						(87)						17
Gains (losses) from fair value adjustments			—						—						—
Equity securities:
Net realized gains (losses) from dispositions			8						112						28
Gains (losses) from fair value adjustments			—						(460)						236
Other invested assets			—						13						6
Short-term investments gain (loss)			—						—						—
Total net gains (losses) on investments			$	(276)					$	(455)					$	258

(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, 2023
			Corporate Securities						Asset-Backed 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.)

			Roll Forward of Allowance for Credit Losses - Fixed Maturities - Available for Sale
			Twelve Months Ended December 31, 2022
			Corporate Securities						Asset-Backed Securities						Foreign Corporate Securities						Total
(Dollars in millions)
Beginning Balance			$	(19)					$	(8)					$	(3)					$	(30)
Credit losses on securities where credit losses were not previously recorded			(11)						—						(16)						(26)
Increases in allowance on previously impaired securities			(20)						—						(1)						(21)
Decreases in allowance on previously impaired securities
Reduction in allowance due to disposals			6						8						10						23
Balance, end of period			$	(45)					$	—					$	(10)					$	(54)

(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, 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.)

			Roll Forward of Allowance for Credit Losses - Fixed Maturities - Held to Maturity
			Twelve Months Ended December 31, 2022
			Corporate Securities						Asset-Backed Securities						Foreign Corporate Securities						Total
(Dollars in millions)
Beginning Balance			$	—					$	—					$	—					$	—
Credit losses on securities where credit losses were not previously recorded			(2)						(6)						(1)						(9)
Increases in allowance on previously impaired securities			—						—						—						—
Decreases in allowance on previously
Reduction in allowance due to disposals			—						—						—						—
Balance, end of period			$	(2)					$	(6)					$	(1)					$	(9)

(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)			2023						2022						2021
Proceeds from sales of fixed maturity securities - available for sale			$	3,849					$	1,403					$	1,916
Gross gains from sales			35						40						72
Gross losses from sales			(327)						(127)						(55)
Proceeds from sales of equity securities			$	126					$	2,217					$	990
Gross gains from sales			8						165						42
Gross losses from sales			—						(53)						(15)

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Tabular disclosure of fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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