Loews (L) 10-Q 6 May 24 2024 Q1 Quarterly report Financial data

COVER

COVER - shares	3 Months Ended
	Mar. 31, 2024	May 03, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2024
Document Transition Report	false
Entity File Number	1-06541
Entity Registrant Name	LOEWS CORP
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	13-2646102
Entity Address, Address Line One	9 West 57th Street
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10019-2714
City Area Code	212
Local Phone Number	521-2000
Title of 12(b) Security	Common stock, par value $0.01 per share
Trading Symbol	L
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		221,406,259
Entity Central Index Key	0000060086
Current Fiscal Year End Date	--12-31
Amendment Flag	false
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1

CONSOLIDATED CONDENSED BALANCE

CONSOLIDATED CONDENSED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Investments:
Fixed maturities, amortized cost of $43,113 and $42,615, less allowance for credit loss of $20 and $16	$ 40,840	$ 40,626
Equity securities, cost of $1,027 and $1,015	1,104	1,050
Limited partnership investments	2,274	2,174
Other invested assets, primarily mortgage loans, less allowance for credit loss of $35 and $35	1,117	1,123
Short-term investments	5,388	4,396
Total investments	50,723	49,369
Cash	556	399
Receivables	9,754	9,660
Property, plant and equipment	10,723	10,718
Goodwill	347	347
Deferred non-insurance warranty acquisition expenses	3,621	3,661
Deferred acquisition costs of insurance subsidiaries	927	896
Other assets	4,255	4,147
Total assets	80,906	79,197
Insurance reserves:
Claim and claim adjustment expense	23,588	23,304
Future policy benefits	13,513	13,959
Unearned premiums	7,046	6,933
Total insurance reserves	44,147	44,196
Payable to brokers	202	79
Short-term debt	1,678	1,084
Long-term debt	8,425	7,919
Deferred income taxes	500	398
Deferred non-insurance warranty revenue	4,645	4,694
Other liabilities	4,311	4,302
Total liabilities	63,908	62,672
Commitments and contingent liabilities
Shareholders' equity:
Preferred stock
Common stock	2	2
Additional paid-in capital	2,547	2,589
Retained earnings	16,060	15,617
Accumulated other comprehensive loss	(2,401)	(2,497)
Shareholders' equity before treasury stock, total	16,208	15,711
Less treasury stock, at cost (335,123 and 100,000 shares)	(24)	(7)
Total shareholders’ equity	16,184	15,704
Noncontrolling interests	814	821
Total equity	16,998	16,525
Total liabilities and equity	$ 80,906	$ 79,197

CONSOLIDATED CONDENSED BALANC_2

CONSOLIDATED CONDENSED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Investments:
Fixed maturities, amortized cost	$ 43,113	$ 42,615
Fixed maturities, allowance for credit loss	20	16
Equity securities, cost	1,027	1,015
Other invested assets, primarily mortgage loans, allowance for credit loss	$ 35	$ 35
Shareholders' equity:
Preferred stock, par value (in dollars per share)	$ 0.10	$ 0.10
Preferred stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	1,800,000,000	1,800,000,000
Common stock, shares issued (in shares)	222,421,077	222,268,150
Treasury stock, shares (in shares)	335,123	100,000

CONSOLIDATED CONDENSED STATEMEN

CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenues:
Insurance premiums	$ 2,441	$ 2,248
Net investment income	669	569
Investment losses	(22)	(35)
Non-insurance warranty revenue	407	407
Operating revenues and other	736	594
Total	4,231	3,783
Expenses:
Insurance claims and policyholders’ benefits (re-measurement gain (loss) of $(15) and $1)	1,807	1,653
Amortization of deferred acquisition costs	444	379
Non-insurance warranty expense	394	384
Operating expenses and other	880	781
Equity method income	(26)	(28)
Interest	103	95
Total	3,602	3,264
Income before income tax	629	519
Income tax expense	(144)	(115)
Net income	485	404
Amounts attributable to noncontrolling interests	(28)	(29)
Net income attributable to Loews Corporation	$ 457	$ 375
Basic net income per share (in dollars per share)	$ 2.05	$ 1.61
Diluted net income per share (in dollars per share)	$ 2.05	$ 1.61
Weighted average shares outstanding:
Shares of common stock (in shares)	222,470	233,300
Dilutive potential shares of common stock (in shares)	310	320
Total weighted average shares outstanding assuming dilution (in shares)	222,780	233,620

CONSOLIDATED CONDENSED STATEM_2

CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Statement [Abstract]
Re-measurement loss of insurance claims and policyholders’ benefits	$ (15)	$ 1

CONSOLIDATED CONDENSED STATEM_3

CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 485	$ 404
Other comprehensive income (loss), after tax
Net unrealized gains (losses) on investments with an allowance for credit losses	2	(8)
Net unrealized gains (losses) on other investments	(217)	670
Total unrealized gains (losses) on investments	(215)	662
Impact of changes in discount rates used to measure long-duration contract liabilities	341	(396)
Unrealized gains (losses) on cash flow hedges	2	(2)
Pension and postretirement benefits	6	9
Foreign currency translation	(33)	16
Other comprehensive income (loss)	101	289
Comprehensive income	586	693
Amounts attributable to noncontrolling interests	(36)	(60)
Total comprehensive income attributable to Loews Corporation	$ 550	$ 633

CONSOLIDATED CONDENSED STATEM_4

CONSOLIDATED CONDENSED STATEMENTS OF EQUITY (Unaudited) - USD ($) $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	As Reported	Common Stock	Common Stock As Reported	Additional Paid-in Capital	Additional Paid-in Capital As Reported	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings As Reported	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Income (Loss) As Reported	Common Stock Held in Treasury	Common Stock Held in Treasury As Reported	Noncontrolling Interests	Noncontrolling Interests Cumulative Effect, Period of Adoption, Adjustment	Noncontrolling Interests As Reported
Balance at beginning of period at Dec. 31, 2022	$ 15,201	$ (277)	$ 15,478	$ 2	$ 2	$ 2,748	$ 2,748	$ 14,931	$ (213)	$ 15,144	$ (3,320)	$ (36)	$ (3,284)	$ (12)	$ (12)	$ 852	$ (28)	$ 880
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	404							375								29
Other comprehensive income	289										258					31
Dividends paid ($0.0625 per share)	(59)							(15)
Dividends paid ($0.0625 per share)																(44)
Purchase of subsidiary stock from noncontrolling interests	(24)															(24)
Purchases of Loews Corporation treasury stock	(486)													(486)
Stock-based compensation	(4)					(26)										22
Other	(7)					(6)		2								(3)
Balance at end of period at Mar. 31, 2023	15,314			2		2,716		15,293			(3,062)			(498)		863
Balance at beginning of period at Dec. 31, 2023	16,525			2		2,589		15,617			(2,497)			(7)		821
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	485							457								28
Other comprehensive income	101										93					8
Dividends paid ($0.0625 per share)	(70)							(14)
Dividends paid ($0.0625 per share)																(56)
Purchases of Loews Corporation treasury stock	(17)													(17)
Stock-based compensation	(14)					(33)										19
Other	(12)					(9)					3					(6)
Balance at end of period at Mar. 31, 2024	$ 16,998			$ 2		$ 2,547		$ 16,060			$ (2,401)			$ (24)		$ 814

CONSOLIDATED CONDENSED STATEM_5

CONSOLIDATED CONDENSED STATEMENTS OF EQUITY (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Stockholders' Equity [Abstract]
Dividends paid (in dollars per share)	$ 0.0625	$ 0.0625

CONSOLIDATED CONDENSED STATEM_6

CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating Activities:
Net income	$ 485	$ 404
Adjustments to reconcile net income to net cash provided by operating activities, net	175	204
Changes in operating assets and liabilities, net:
Receivables	(113)	5
Deferred acquisition costs	(34)	(45)
Insurance reserves	443	432
Other assets	(114)	(85)
Other liabilities	(37)	(238)
Trading securities	(607)	42
Net cash flow provided by operating activities	198	719
Investing Activities:
Purchases of fixed maturities	(1,621)	(2,258)
Proceeds from sales of fixed maturities	736	1,414
Proceeds from maturities of fixed maturities	507	317
Purchases of equity securities	(169)	(82)
Proceeds from sales of equity securities	186	62
Purchases of limited partnership investments	(77)	(116)
Proceeds from sales of limited partnership investments	13	75
Purchases of property, plant and equipment	(159)	(159)
Dispositions	23
Change in short-term investments	(455)	647
Other, net	(10)	(34)
Net cash flow used by investing activities	(1,026)	(134)
Financing Activities:
Dividends paid	(14)	(15)
Dividends paid to noncontrolling interests	(56)	(44)
Purchases of Loews Corporation treasury stock	(24)	(462)
Purchases of subsidiary stock from noncontrolling interests		(24)
Principal payments on debt	(201)	(1)
Issuance of debt	1,299	37
Other, net	(17)	(15)
Net cash flow provided by (used by) financing activities	987	(524)
Effect of foreign exchange rate on cash	(2)	1
Net change in cash	157	62
Cash, beginning of period	399	532
Cash, end of period	$ 556	$ 594

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2024
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation Loews Corporation is a holding company. Its consolidated operating subsidiaries are engaged in the following lines of business: commercial property and casualty insurance (CNA Financial Corporation (“CNA”), an approximately 92% owned subsidiary); transportation and storage of natural gas and natural gas liquids and other hydrocarbons (Boardwalk Pipeline Partners, LP (“Boardwalk Pipelines”), a wholly owned subsidiary) and the operation of a chain of hotels (Loews Hotels Holding Corporation (“Loews Hotels & Co”), a wholly owned subsidiary). Unless the context otherwise requires, as used herein, the term “Company” means Loews Corporation including its consolidated subsidiaries, the term “Parent Company” means Loews Corporation excluding its subsidiaries, the term “Net income (loss) attributable to Loews Corporation” means Net income (loss) attributable to Loews Corporation shareholders and the term “subsidiaries” means Loews Corporation’s consolidated subsidiaries. In the opinion of management, the accompanying unaudited Consolidated Condensed Financial Statements reflect all adjustments (consisting of normal recurring accruals) necessary to present fairly the Company’s financial position as of March 31, 2024 and December 31, 2023 and results of operations, comprehensive income (loss), changes in shareholders’ equity and cash flows for the three months ended March 31, 2024 and 2023, in each case in accordance with accounting principles generally accepted in the United States of America (“GAAP”). Results for the interim periods are not necessarily indicative of results for the entire year. These Consolidated Condensed Financial Statements should be read in conjunction with the Consolidated Financial Statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023. The Company presents basic and diluted net income (loss) per share on the Consolidated Condensed Statements of Operations. Basic net income (loss) per share excludes dilution and is computed by dividing net income (loss) attributable to common stock by the weighted average number of common shares outstanding for the period. Diluted net income per share reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock. For the three months ended March 31, 2024 and 2023 there were no shares attributable to employee stock-based compensation awards excluded from the diluted weighted average shares outstanding amounts because the effect would have been antidilutive. Recently issued Accounting Standards Updates (“ASUs”) - In November of 2023, the Financial Accounting Standards Board (“FASB”) issued ASU 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures.” The updated accounting guidance requires enhanced reportable segment disclosures, primarily related to significant segment expenses which are regularly provided to the chief operating decision maker. The guidance is effective for fiscal years beginning after December 15, 2023 and interim periods within fiscal years beginning after December 15, 2024. Retrospective application is required and early adoption is permitted. The Company is currently evaluating the effect the updated guidance will have on its financial statement disclosures. In December of 2023, the FASB issued ASU 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures.” The updated accounting guidance requires expanded income tax disclosures, including the disaggregation of existing disclosures related to the effective tax rate reconciliation and income taxes paid. The guidance is effective for fiscal years beginning after December 15, 2024. Prospective application is required, with retrospective application permitted. The Company is currently evaluating the effect the updated guidance will have on its financial statement disclosures.

Investments

Investments	3 Months Ended
	Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Investments	Investments Net investment income is as follows: Three Months Ended March 31 2024 2023 (In millions) Fixed maturity securities $ 502 $ 470 Limited partnership investments 54 27 Short-term investments 29 16 Equity securities (a) 22 12 Income from trading portfolio (a) 58 45 Other 28 20 Total investment income 693 590 Investment expenses (24) (21) Net investment income $ 669 $ 569 (a) Net investment income recognized due to the change in fair value of equity and trading portfolio securities held as of March 31, 2024 and 2023 $ 48 $ 11 Investment gains (losses) are as follows: Three Months Ended March 31 2024 2023 (In millions) Fixed maturity securities: Gross gains $ 14 $ 35 Gross losses (46) (57) Investment losses on fixed maturity securities (32) (22) Equity securities (a) 11 (14) Short-term investments and other (1) 1 Investment losses $ (22) $ (35) (a) Investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock included within equity securities held as of March 31, 2024 and 2023 $ 11 $ (2) The available-for-sale impairment losses (gains) recognized in earnings by asset type are presented in the following table. The table includes losses (gains) on securities with an intention to sell and changes in the allowance for credit losses on securities since acquisition date: Three Months Ended March 31 2024 2023 (In millions) Fixed maturity securities available-for-sale: Corporate and other bonds $ 9 $ 8 Asset-backed 5 Impairment losses recognized in earnings $ 14 $ 8 T here were no losses recognized on mortgage loans during the three months ended March 31, 2024 or 2023. The following tables present a summary of fixed maturity securities: March 31, 2024 Cost or Amortized Cost Gross Unrealized Gross Unrealized Allowance Estimated (In millions) Fixed maturity securities: Corporate and other bonds $ 25,221 $ 485 $ 1,374 $ 3 $ 24,329 States, municipalities and political 7,726 318 756 7,288 Asset-backed: Residential mortgage-backed 3,563 10 483 3,090 Commercial mortgage-backed 1,838 8 193 8 1,645 Other asset-backed 3,586 19 251 9 3,345 Total asset-backed 8,987 37 927 17 8,080 U.S. Treasury and obligations of 181 2 179 Foreign government 763 3 37 729 Fixed maturities available-for-sale $ 42,878 $ 843 $ 3,096 $ 20 $ 40,605 Fixed maturities trading 235 235 Total fixed maturity securities $ 43,113 $ 843 $ 3,096 $ 20 $ 40,840 December 31, 2023 Fixed maturity securities: Corporate and other bonds $ 25,020 $ 597 $ 1,345 $ 4 $ 24,268 States, municipalities and political 7,713 382 703 7,392 Asset-backed: Residential mortgage-backed 3,411 16 425 3,002 Commercial mortgage-backed 1,862 7 230 8 1,631 Other asset-backed 3,515 13 256 4 3,268 Total asset-backed 8,788 36 911 12 7,901 U.S. Treasury and obligations of 152 1 2 151 Foreign government 741 6 34 713 Fixed maturities available-for-sale $ 42,414 $ 1,022 $ 2,995 $ 16 $ 40,425 Fixed maturities trading 201 201 Total fixed maturity securities $ 42,615 $ 1,022 $ 2,995 $ 16 $ 40,626 The available-for-sale fixed maturity securities in a gross unrealized loss position for which an allowance for credit losses has not been recorded are as follows: Less than 12 Months 12 Months or Longer Total March 31, 2024 Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses (In millions) Fixed maturity securities: Corporate and other bonds $ 2,578 $ 48 $ 13,459 $ 1,326 $ 16,037 $ 1,374 States, municipalities and political 686 17 3,266 739 3,952 756 Asset-backed: Residential mortgage-backed 434 8 2,159 475 2,593 483 Commercial mortgage-backed 131 2 1,162 191 1,293 193 Other asset-backed 588 9 1,833 242 2,421 251 Total asset-backed 1,153 19 5,154 908 6,307 927 U.S. Treasury and obligations of 100 1 28 1 128 2 Foreign government 136 2 452 35 588 37 Total fixed maturity securities $ 4,653 $ 87 $ 22,359 $ 3,009 $ 27,012 $ 3,096 December 31, 2023 Fixed maturity securities: Corporate and other bonds $ 1,943 $ 37 $ 13,406 $ 1,308 $ 15,349 $ 1,345 States, municipalities and political 598 18 3,104 685 3,702 703 Asset-backed: Residential mortgage-backed 233 4 2,212 421 2,445 425 Commercial mortgage-backed 200 5 1,184 225 1,384 230 Other asset-backed 392 8 1,869 248 2,261 256 Total asset-backed 825 17 5,265 894 6,090 911 U.S. Treasury and obligations of 65 1 23 1 88 2 Foreign government 52 1 450 33 502 34 Total fixed maturity securities $ 3,483 $ 74 $ 22,248 $ 2,921 $ 25,731 $ 2,995 The following table presents the estimated fair value and gross unrealized losses of available-for-sale fixed maturity securities in a gross unrealized loss position for which an allowance for credit loss has not been recorded, by ratings distribution. March 31, 2024 December 31, 2023 Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses (In millions) U.S. Government, Government agencies and Government-sponsored enterprises $ 2,426 $ 361 $ 2,273 $ 309 AAA 1,661 280 1,524 261 AA 4,109 690 3,817 658 A 6,324 570 5,652 517 BBB 11,672 1,083 11,523 1,095 Non-investment grade 820 112 942 155 Total $ 27,012 $ 3,096 $ 25,731 $ 2,995 Based on current facts and circumstances, the unrealized losses presented in the March 31, 2024 securities in the gross unrealized loss position table above are not believed to be indicative of the ultimate collectibility of the current amortized cost of the securities, but rather are primarily attributable to changes in risk-free interest rates. In reaching this determination, the volatility in risk-free rates and credit spreads, as well as the fact that the unrealized losses are concentrated in investment grade issuers, were considered. Additionally, there is no current intent to sell securities with unrealized losses, nor is it more likely than not that sale will be required prior to recovery of amortized cost; accordingly, it was determined that there are no additional impairment losses to be recorded as of March 31, 2024. The following tables present the activity related to the allowance on available-for-sale securities with credit impairments and purchased credit-deteriorated (“PCD”) assets. Accrued interest receivables on available-for-sale fixed maturity securities totaled $437 million, $435 million and $407 million as of March 31, 2024, December 31, 2023 and March 31, 2023 and are excluded from the estimate of expected credit losses and the amortized cost basis in the tables within this Note. Three months ended March 31, 2024 Corporate and Other Bonds Asset-backed Total (In millions) Allowance for credit losses: Balance as of January 1, 2024 $ 4 $ 12 $ 16 Additions to the allowance for credit losses: Available-for-sale securities accounted for as PCD assets — Reductions to the allowance for credit losses: Securities sold during the period (realized) — Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis 1 1 Additional increases to the allowance for credit losses on securities that had an allowance recorded in a previous period 5 5 Total allowance for credit losses $ 3 $ 17 $ 20 Three months ended March 31, 2023 Corporate and Other Bonds Asset-backed Total (In millions) Allowance for credit losses: Balance as of January 1, 2023 $ — $ 1 $ 1 Additions to the allowance for credit losses: Available-for-sale securities accounted for as PCD assets 9 9 Reductions to the allowance for credit losses: Securities sold during the period (realized) 6 6 Intent to sell or more likely than not will be required to sell the 3 3 Additional increases to the allowance for credit losses on securities that had an allowance recorded in a previous period 1 1 Total allowance for credit losses $ 1 $ 1 $ 2 Contractual Maturity The following table presents available-for-sale fixed maturity securities by contractual maturity. March 31, 2024 December 31, 2023 Cost or Amortized Cost Estimated Fair Cost or Amortized Cost Estimated (In millions) Due in one year or less $ 1,238 $ 1,207 $ 1,121 $ 1,091 Due after one year through five years 11,680 11,308 11,563 11,180 Due after five years through ten years 13,283 12,461 13,359 12,573 Due after ten years 16,677 15,629 16,371 15,581 Total $ 42,878 $ 40,605 $ 42,414 $ 40,425 Actual maturities may differ from contractual maturities because certain securities may be called or prepaid. Securities not due at a single date are allocated based on weighted average life. Mortgage Loans The following table presents the amortized cost basis of mortgage loans for each credit quality indicator by year of origination. The primary credit quality indicators utilized are debt service coverage ratios (“DSCR”) and loan-to-value (“LTV”) ratios. Mortgage Loans Amortized Cost Basis by Origination Year (a) As of March 31, 2024 2024 2023 2022 2021 2020 Prior Total (In millions) DSCR ≥1.6x LTV less than 55% $ 33 $ 9 $ 2 $ 97 $ 283 $ 424 LTV 55% to 65% 5 5 LTV greater than 65% 30 12 42 DSCR 1.2x - 1.6x LTV less than 55% 28 5 13 63 109 LTV 55% to 65% $ 12 21 36 36 24 31 160 LTV greater than 65% 12 65 77 DSCR ≤1.2x LTV less than 55% — LTV 55% to 65% 32 75 43 150 LTV greater than 65% 28 21 48 97 Total $ 12 $ 126 $ 248 $ 76 $ 134 $ 468 $ 1,064 (a) The values in the table above reflect DSCR on a standardized amortization period and LTV ratios based on the most recent appraised values trended forward using changes in a commercial real estate price index. Derivative Financial Instruments A summary of the aggregate contractual or notional amounts and gross estimated fair values related to derivative financial instruments follows. The contractual or notional amounts for derivatives are used to calculate the exchange of contractual payments under related agreements and may not be representative of the potential for gain or loss on these instruments. Gross estimated fair values of derivative positions are currently presented in Equity securities, Receivables and Payable to brokers on the Consolidated Condensed Balance Sheets. March 31, 2024 December 31, 2023 Contractual/Notional Amount Estimated Fair Value Contractual/Notional Amount Estimated Fair Value Asset (Liability) Asset (Liability) (In millions) Without hedge designation: Equity markets: Options – purchased $ 235 $ 1 $ 202 $ 1 Futures – short 127 116 Warrants 84 3 84 3 Interest rate swaps 300 12 300 13 Currency forwards 13 $ (1) Investment Commitments As part of the overall investment strategy, investments are made in various assets which require future purchase, sale or funding commitments. These investments are recorded once funded, and the related commitments may include future capital calls from various third-party limited partnerships, signed and accepted mortgage loan applications and obligations related to private placement securities. As of March 31, 2024, commitments to purchase or fund were approximately $1.6 billion and to sell were approximately $25 million under the terms of these investments.

Fair Value

Fair Value	3 Months Ended
	Mar. 31, 2024
Fair Value Disclosures [Abstract]
Fair Value	Fair Value Assets and liabilities measured at fair value on a recurring basis are summarized in the following tables. Corporate bonds and other includes obligations of the United States of America (“U.S.”) Treasury, government-sponsored enterprises, foreign governments and redeemable preferred stock. March 31, 2024 Level 1 Level 2 Level 3 Total (In millions) Fixed maturity securities: Corporate bonds and other $ 189 $ 23,966 $ 1,082 $ 25,237 States, municipalities and political subdivisions 7,245 43 7,288 Asset-backed 7,209 871 8,080 Fixed maturities available-for-sale 189 38,420 1,996 40,605 Fixed maturities trading 235 235 Total fixed maturities $ 424 $ 38,420 $ 1,996 $ 40,840 Equity securities $ 654 $ 439 $ 11 $ 1,104 Short-term and other 5,203 19 5,222 Receivables 12 12 Payable to brokers (38) (38) December 31, 2023 Fixed maturity securities: Corporate bonds and other $ 161 $ 23,926 $ 1,045 $ 25,132 States, municipalities and political subdivisions 7,348 44 7,392 Asset-backed 7,000 901 7,901 Fixed maturities available-for-sale 161 38,274 1,990 40,425 Fixed maturities trading 201 201 Total fixed maturities $ 362 $ 38,274 $ 1,990 $ 40,626 Equity securities $ 586 $ 440 $ 24 $ 1,050 Short-term and other 4,215 32 4,247 Receivables 13 13 Payable to brokers (62) (62) The following tables present reconciliations for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the three months ended March 31, 2024 and 2023: Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses) Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at March 31 Unrealized Gains (Losses) Recognized in Other Comprehensive Income (Loss) on Level 3 Assets and Liabilities Held at March 31 2024 Balance, January 1 Included in Net Income Included in OCI Purchases Sales Settlements Transfers into Transfers out of Level 3 Balance, March 31 (In millions) Fixed maturity securities: Corporate bonds and other $ 1,045 $ (12) $ 74 $ (36) $ 11 $ 1,082 $ (14) States, municipalities and political subdivisions 44 (1) 43 (1) Asset-backed 901 $ 2 (5) 18 $ (9) (17) $ (19) 871 (5) Fixed maturities available-for-sale $ 1,990 $ 2 $ (18) $ 92 $ (9) $ (53) $ 11 $ (19) $ 1,996 $ — $ (20) Equity securities $ 24 $ 6 $ (19) $ 11 $ 1 Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses) Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at March 31 Unrealized Gains (Losses) Recognized in Other Comprehensive Income (Loss) on Level 3 Assets and Liabilities Held at March 31 2023 Balance, January 1 Included in Net Income Included in OCI Purchases Sales Settlements Transfers into Transfers out of Level 3 Balance, March 31 (In millions) Fixed maturity securities: Corporate bonds and other $ 810 $ 24 $ 81 $ (3) $ 912 $ 24 States, municipalities and political subdivisions 43 1 44 1 Asset-backed 788 $ 5 7 55 (9) $ 23 $ (10) 859 7 Fixed maturities available-for-sale $ 1,641 $ 5 $ 32 $ 136 $ — $ (12) $ 23 $ (10) $ 1,815 $ — $ 32 Equity securities $ 35 $ (6) $ 29 $ (6) Net investment gains and losses are reported in Net income as follows: Major Category of Assets and Liabilities Consolidated Condensed Statements of Operations Line Items Fixed maturity securities available-for-sale Investment gains (losses) Fixed maturity securities trading Net investment income Equity securities Investment gains (losses) and Net investment income Other invested assets Investment gains (losses) and Net investment income Derivative financial instruments held in a trading portfolio Net investment income Derivative financial instruments, other Investment gains (losses) and Operating revenues and other Significant Unobservable Inputs The following tables present quantitative information about the significant unobservable inputs utilized in the fair value measurement of Level 3 assets. Valuations for assets and liabilities not presented in the tables below are primarily based on broker/dealer quotes for which there is a lack of transparency as to inputs used to develop the valuations. The quantitative detail of unobservable inputs from these broker quotes is neither provided nor reasonably available. The weighted average rate is calculated based on fair value. March 31, 2024 Estimated Valuation Techniques Unobservable Inputs Range (Weighted Average) (In millions) Fixed maturity securities $ 1,521 Discounted cash flow Credit spread 1 % — 7 % (2 %) December 31, 2023 Fixed maturity securities $ 1,495 Discounted cash flow Credit spread 1 % — 7 % (2 %) For fixed maturity securities, an increase to the credit spread assumptions would result in a lower fair value measurement. Financial Assets and Liabilities Not Measured at Fair Value The carrying amount, estimated fair value and the level of the fair value hierarchy of the financial assets and liabilities which are not measured at fair value on the Consolidated Condensed Balance Sheets are presented in the following tables. The carrying amounts and estimated fair values of short-term debt and long-term debt exclude finance lease obligations. The carrying amounts reported on the Consolidated Condensed Balance Sheets for cash and short-term investments not carried at fair value and certain other assets and liabilities approximate fair value due to the short-term nature of these items. Carrying Amount Estimated Fair Value March 31, 2024 Level 1 Level 2 Level 3 Total (In millions) Assets: Other invested assets, primarily mortgage loans $ 1,029 $ 987 $ 987 Liabilities: Short-term debt 1,677 $ 1,145 519 1,664 Long-term debt 8,422 7,663 431 8,094 December 31, 2023 Assets: Other invested assets, primarily mortgage loans $ 1,035 $ 997 $ 997 Liabilities: Short-term debt 1,083 $ 546 520 1,066 Long-term debt 7,915 7,255 385 7,640

Claim and Claim Adjustment Expe

Claim and Claim Adjustment Expense Reserves	3 Months Ended
	Mar. 31, 2024
Insurance [Abstract]
Claim and Claim Adjustment Expense Reserves	Claim and Claim Adjustment Expense Reserves Claim and claim adjustment expense reserves represent the estimated amounts necessary to resolve all outstanding claims, including incurred but not reported (“IBNR”) claims as of the reporting date. Reserve projections are based primarily on detailed analysis of the facts in each case, experience with similar cases and various historical development patterns. Consideration is given to historical patterns such as claim reserving trends and settlement practices, loss payments, pending levels of unpaid claims and product mix, economic, medical and social inflation, and public attitudes. All of these factors can affect the estimation of claim and claim adjustment expense reserves. Establishing claim and claim adjustment expense reserves, including claim and claim adjustment expense reserves for catastrophic events that have occurred, is an estimation process. Many factors can ultimately affect the final settlement of a claim and, therefore, the necessary reserve. Changes in the law, results of litigation, medical costs, the cost of repair materials and labor rates can affect ultimate claim costs. In addition, time can be a critical part of reserving determinations since the longer the span between the incidence of a loss and the payment or settlement of the claim, the more variable the ultimate settlement amount can be. Accordingly, short-tail claims, such as property damage claims, tend to be more reasonably estimable than long-tail claims, such as workers’ compensation, general liability and professional liability claims. Claim and claim adjustment expense reserves are also maintained for structured settlement obligations. In developing the claim and claim adjustment expense reserve estimates for structured settlement obligations, actuaries review mortality experience on an annual basis. Adjustments to prior year reserve estimates, if necessary, are reflected in the results of operations in the period that the need for such adjustments is determined. There can be no assurance that the ultimate cost for insurance losses will not exceed current estimates. Catastrophes are an inherent risk of the property and casualty insurance business and have contributed to material period-to-period fluctuations in the Company’s results of operations and/or equity. The Company reported catastrophe losses, net of reinsurance, of $88 million and $52 million for the three months ended March 31, 2024 and 2023 primarily related to severe weather related events. Liability for Unpaid Claim and Claim Adjustment Expenses The following table presents a reconciliation between beginning and ending claim and claim adjustment expense reserves. Three Months Ended March 31 2024 2023 (In millions) Reserves, beginning of year: Gross $ 23,304 $ 22,120 Ceded 5,141 5,191 Net reserves, beginning of year 18,163 16,929 Net incurred claim and claim adjustment expenses: Provision for insured events of current year 1,502 1,326 Increase (decrease) in provision for insured events of prior years (6) 13 Amortization of discount 10 11 Total net incurred (a) 1,506 1,350 Net payments attributable to: Current year events (113) (72) Prior year events (1,168) (1,042) Total net payments (1,281) (1,114) Foreign currency translation adjustment and other (41) 35 Net reserves, end of period 18,347 17,200 Ceded reserves, end of period 5,241 5,209 Gross reserves, end of period $ 23,588 $ 22,409 (a) Total net incurred does not agree to Insurance claims and policyholders’ benefits as reflected on the Consolidated Condensed Statements of Operations due to amounts related to retroactive reinsurance deferred gain accounting, uncollectible reinsurance, benefit expenses related to future policy benefits and policyholders’ dividends, which are not reflected in the table above. Net Prior Year Development Changes in estimates of claim and claim adjustment expense reserves, net of reinsurance, for prior years are defined as net prior year loss reserve development. These changes can be favorable or unfavorable. CNA’s commercial property and casualty operations (“Property & Casualty Operations”) recorded favorable net prior year loss reserve development of $7 million and unfavorable net prior year loss reserve development of $13 million for the three months ended March 31, 2024 and 2023. The following table and discussion present details of the net prior year loss reserve development in Property & Casualty Operations: Three Months Ended March 31 2024 2023 (In millions) Medical professional liability $ 9 Surety $ (18) Warranty 13 (9) Workers’ compensation (2) (2) Other property and casualty operations 15 Total pretax (favorable) unfavorable development $ (7) $ 13 2024 Favorable development in surety was primarily due to lower than expected frequency and lack of systemic activity in multiple accident years. Unfavorable development in warranty was primarily due to higher than expected frequency and severity in a recent accident year. 2023 Unfavorable development in other property and casualty operations was due to higher than expected large loss emergence in CNA’s professional liability business in accident year 2017. Asbestos & Environmental Pollution (“A&EP”) Reserves In 2010, Continental Casualty Company (“CCC”) together with several insurance subsidiaries completed a transaction with National Indemnity Company (“NICO”), a subsidiary of Berkshire Hathaway Inc., under which substantially all of their legacy A&EP liabilities were ceded to NICO through a loss portfolio transfer (“LPT”). At the effective date of the transaction, approximately $1.6 billion of net A&EP claim and allocated claim adjustment expense reserves were ceded to NICO under a retroactive reinsurance agreement with an aggregate limit of $4.0 billion. The $1.6 billion of claim and allocated claim adjustment expense reserves ceded to NICO was net of $1.2 billion of ceded claim and allocated claim adjustment expense reserves under existing third party reinsurance contracts. The NICO LPT aggregate reinsurance limit also covers credit risk on the existing third party reinsurance related to these liabilities. NICO was paid a reinsurance premium of $2.0 billion and billed third party reinsurance receivables related to A&EP claims with a net book value of $215 million were transferred to NICO, resulting in total consideration of $2.2 billion. In years subsequent to the effective date of the LPT, adverse prior year development on A&EP reserves was recognized resulting in additional amounts ceded under the LPT. As a result, the cumulative amounts ceded under the LPT have exceeded the $2.2 billion consideration paid, resulting in the NICO LPT moving into a gain position, requiring retroactive reinsurance accounting. Under retroactive reinsurance accounting, this gain is deferred and only recognized in earnings in proportion to actual paid recoveries under the LPT. Over the life of the contract, there is no economic impact as long as any additional losses incurred are within the limit of the LPT. In a period in which a change in the estimate of A&EP reserves is recognized that increases or decreases the amounts ceded under the LPT, the proportion of actual paid recoveries to total ceded losses is affected and the change in the deferred gain is recognized in earnings as if the revised estimate of ceded losses was available at the effective date of the LPT. The effect of the deferred retroactive reinsurance benefit is recorded in Insurance claims and policyholders’ benefits in the Consolidated Condensed Statements of Operations. The impact of the LPT on the Consolidated Condensed Statements of Operations was the recognition of a retroactive reinsurance benefit of $12 million and $8 million for the three months ended March 31, 2024 and 2023 . As of March 31, 2024 and December 31, 2023, the cumulative amounts ceded under the LPT were $3.6 billion. The unrecognized deferred retroactive reinsurance benefit was $405 million and $417 million as of March 31, 2024 and December 31, 2023 and is included within Other liabilities on the Consolidated Condensed Balance Sheets. NICO established a collateral trust account as security for its obligations under the LPT. The fair value of the collateral trust account was $2.6 billion as of March 31, 2024. In addition, Berkshire Hathaway Inc. guaranteed the payment obligations of NICO up to the aggregate reinsurance limit as well as certain of NICO’s performance obligations under the trust agreement. NICO is responsible for claims handling and billing and collection from third-party reinsurers related to A&EP claims. Credit Risk for Ceded Reserves The majority of CNA’s outstanding voluntary reinsurance receivables are due from reinsurers with financial strength ratings of A- or higher. Receivables due from reinsurers with lower financial strength ratings are primarily due from captive reinsurers and are backed by collateral arrangements.

Future Policy Benefits Reserves

Future Policy Benefits Reserves	3 Months Ended
	Mar. 31, 2024
Insurance [Abstract]
Future Policy Benefit Reserves	Future Policy Benefits Reserves Future policy benefits reserves are associated with CNA’s run-off long-term care business, included in Other Insurance Operations, and relate to policyholders that are currently receiving benefits, including claims that have been incurred but are not yet reported, as well as policyholders that are not yet receiving benefits. Future policy benefits reserves are comprised of the liability for future policyholder benefits (“LFPB”) which is reflected as Insurance reserves: Future policy benefits on the Consolidated Condensed Balance Sheet. The determination of Future policy benefits reserves requires management to make estimates and assumptions about expected policyholder experience over the remaining life of the policy. Since policies may be in force for several decades, these assumptions are subject to significant estimation risk. As a result of this variability, CNA’s future policy benefits reserves may be subject to material increases if actual experience develops adversely to its expectations. For further information on the long-term care reserving process see Note 1 of the Consolidated Financial Statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023. The following table summarizes balances and changes in the LFPB: 2024 2023 (In millions) Present value of future net premiums Balance, January 1 $ 3,710 $ 3,993 Effect of changes in discount rate (125) (74) Balance, January 1, at original locked in discount rate 3,585 3,919 Effect of changes in cash flow assumptions (a) Effect of actual variances from expected experience (a) (28) (49) Adjusted balance, January 1 3,557 3,870 Interest accrual 47 52 Net premiums: earned during period (107) (111) Balance, end of period at original locked in discount rate 3,497 3,811 Effect of changes in discount rate 56 154 Balance, March 31 $ 3,553 $ 3,965 Present value of future benefits & expenses Balance, January 1 $ 17,669 $ 17,472 Effect of changes in discount rate (578) (125) Balance, January 1, at original locked in discount rate 17,091 17,347 Effect of changes in cash flow assumptions (a) Effect of actual variances from expected experience (a) (13) (50) Adjusted balance, January 1 17,078 17,297 Interest accrual 231 242 Benefit & expense payments (321) (302) Balance, end of period at original locked in discount rate 16,988 17,237 Effect of changes in discount rate 78 704 Balance, March 31 $ 17,066 $ 17,941 Net LFPB, March 31 $ 13,513 $ 13,976 (a) As of March 31, 2024 and 2023 , the re-measurement gain (loss) of $(15) million and $1 million presented parenthetically on the Consolidated Condensed Statement of Operations is comprised of the effect of changes in cash flow assumptions and the effect of actual variances from expected experience. The following table presents earned premiums and interest expense associated with the long-term care business recognized on the Condensed Consolidated Statement of Operations. Three Months Ended March 31 2024 2023 (In millions) Earned premiums $ 110 $ 115 Interest expense 184 190 The following table presents undiscounted expected future benefit and expense payments and undiscounted expected future gross premiums. March 31, 2024 2023 (In millions) Expected future benefit and expense payments $ 32,474 $ 33,759 Expected future gross premiums 5,270 5,729 Discounted expected future gross premiums at the upper-medium grade fixed income instrument yield discount rate were $3.7 billion and $4.0 billion as of March 31, 2024 and 2023. The weighted average effective duration of the LFPB calculated using the original locked in discount rate was 11 years and 12 years as of March 31, 2024 and 2023. The weighted average interest rates in the table below are calculated based on the rate used to discount all future cash flows. March 31, December 31, 2024 2023 2023 Original locked in discount rate 5.22 % 5.26 % 5.22 % Upper-medium grade fixed income instrument discount rate 5.20 4.92 4.94

Shareholders' Equity

Shareholders' Equity	3 Months Ended
	Mar. 31, 2024
Equity [Abstract]
Shareholders' Equity	Shareholders’ Equity Accumulated other comprehensive income (loss) The tables below present the changes in Accumulated other comprehensive income (loss) (“AOCI”) by component for the three months ended March 31, 2023 and 2024 : Net Unrealized Gains (Losses) on Investments with an Allowance for Credit Losses Net Unrealized Gains (Losses) on Other Investments Cumulative Unrealized Gains (Losses) on Cash Flow Hedges Pension and Postretirement Benefits Foreign Currency Translation Total Accumulated Other Comprehensive Income (Loss) (In millions) Balance, January 1, 2023, as reported $ (7) $ (2,469) $ — $ 14 $ (622) $ (200) $ (3,284) Cumulative effect adjustments from changes in accounting standard s, after tax of $0, $0, $11, $0, $0 and $0 (36) (36) Balance, January 1, 2023, as adjusted (7) (2,469) (36) 14 (622) (200) (3,320) Other comprehensive income (loss) before reclassifications, after tax of $2, $(176), $105, $1, $0 and $0 (8) 652 (396) (2) 16 262 Reclassification of losses from accumulated other comprehensive loss, after tax of $0, $(4), $0, $0, $(2) and $0 18 9 27 Other comprehensive income (loss) (8) 670 (396) (2) 9 16 289 Amounts attributable to noncontrolling interests 1 (68) 39 (1) (2) (31) Balance, March 31, 2023 $ (14) $ (1,867) $ (393) $ 12 $ (614) $ (186) $ (3,062) Balance, January 1, 2024 $ (12) $ (1,483) $ (329) $ 9 $ (533) $ (149) $ (2,497) Other comprehensive income (loss) before reclassifications, after tax of $0, $64, $(91), $(1), $0 and $0 (1) (239) 341 2 (33) 70 Reclassification of losses from accumulated other comprehensive loss, after tax of $(1), $(6), $0, $0, $(1) and $0 3 22 6 31 Other comprehensive income (loss) 2 (217) 341 2 6 (33) 101 Amounts attributable to noncontrolling interests 19 (29) (1) 3 (8) Other 1 5 (1) (2) 3 Balance, March 31, 2024 $ (9) $ (1,676) $ (17) $ 10 $ (530) $ (179) $ (2,401) Amounts reclassified from AOCI shown above are reported in Net income (loss) as follows: Major Category of AOCI Affected Line Item Net unrealized gains (losses) on investments with an allowance for credit losses and Net unrealized gains (losses) on other investments Investment gains (losses) Unrealized gains (losses) on cash flow hedges Operating revenues and other, Interest expense and Operating expenses and other Pension and postretirement benefits Operating expenses and other Stock Purchases Loews Corporation repurchased 0.2 million and 8.2 million shares of its common stock at aggregate costs of $17 million and $486 million during the three months ended March 31, 2024 and 2023.

Debt

Debt	3 Months Ended
	Mar. 31, 2024
Debt Disclosure [Abstract]
Debt	Debt In February of 2024 , CNA completed a public offering of $500 million aggregate principal amount of its 5.1% senior notes due February 15, 2034 . CNA intends to use the net proceeds towards retiring the outstanding $550 million aggregate principal amount of its 4.0% senior notes due May 2024. In February of 2024 , Boardwalk Pipelines completed a public offering of $600 million aggregate principal amount of its 5.6% senior notes due August 1, 2034 . Boardwalk Pipelines intends to use the net proceeds to retire the outstanding $600 million aggregate principal amount of its 5.0% notes due December 2024 .

Revenue from Contracts with Cus

Revenue from Contracts with Customers	3 Months Ended
	Mar. 31, 2024
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers	Revenue from Contracts with Customers Disaggregation of revenues – Revenue from contracts with customers, other than insurance premiums, is reported as Non-insurance warranty revenue and within Operating revenues and other on the Consolidated Condensed Statements of Operations. The following table presents revenues from contracts with customers disaggregated by revenue type along with the reportable segment and a reconciliation to Operating revenues and other as reported in Note 12 : Three Months Ended March 31 2024 2023 (In millions) Non-insurance warranty – CNA Financial $ 407 $ 407 Transportation and storage of natural gas and NGLs and ethane supply and transportation services – Boardwalk Pipelines $ 501 $ 386 Lodging and related services – Loews Hotels & Co 209 185 Total revenues from contracts with customers 710 571 Other revenues 26 23 Operating revenues and other $ 736 $ 594 Receivables from contracts with customers – As of March 31, 2024 and December 31, 2023, receivables from contracts with customers were approximately $201 million and $228 million and are included within Receivables on the Consolidated Condensed Balance Sheets. Deferred revenue – As of March 31, 2024 and December 31, 2023, deferred revenue resulting from contracts with customers was approximately $4.7 billion and $4.8 billion and is reported as Deferred non-insurance warranty revenue and within Other liabilities on the Consolidated Condensed Balance Sheets. Approximately $410 million and $397 million of revenues recognized during the three months ended March 31, 2024 and 2023 were included in deferred revenue as of December 31, 2023 and 2022. Performance obligations – As of March 31, 2024, approximately $15.1 billion of estimated operating revenues is expected to be recognized in the future related to outstanding performance obligations. The balance relates primarily to revenues for transportation and storage services for natural gas and natural gas liquids and other hydrocarbons (“NGLs”) and certain ethane supply contracts at Boardwalk Pipelines and non-insurance warranty revenue at CNA. Approximately $2.2 billion will be recognized during the remaining nine months of 2024 , $2.5 billion in 2025 and the remainder in following years. The actual timing of recognition may vary due to factors outside of the Company’s control.

Benefit Plans

Benefit Plans	3 Months Ended
	Mar. 31, 2024
Retirement Benefits [Abstract]
Benefit Plans	Benefit Plans The Company has several non-contributory defined benefit plans and postretirement benefit plans covering eligible employees and retirees. The following table presents the components of net periodic (benefit) cost for the defined benefit plans: Pension Benefits Other Postretirement Benefits Three Months Ended March 31 2024 2023 2024 2023 (In millions) Service cost $ 1 $ 1 Interest cost 24 28 $ 1 $ 1 Expected return on plan assets (29) (32) (1) (1) Amortization of unrecognized net loss 7 9 Net periodic cost $ 3 $ 6 $ — $ —

Legal Proceedings

Legal Proceedings	3 Months Ended
	Mar. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Legal Proceedings	Legal Proceedings Boardwalk Pipelines Litigation On May 25, 2018, plaintiffs Tsemach Mishal and Paul Berger (on behalf of themselves and the purported class, “Plaintiffs”) initiated a purported class action in the Court of Chancery of the State of Delaware (the “Trial Court”) against the following defendants: Boardwalk Pipelines, Boardwalk GP, LP (“General Partner”), Boardwalk GP, LLC and Boardwalk Pipelines Holding Corp. (“BPHC”) (together, “Defendants”), regarding the potential exercise by the General Partner of its right to purchase all of the issued and outstanding common units representing limited partnership interests in Boardwalk Pipelines not already owned by the General Partner or its affiliates. On June 25, 2018, Plaintiffs and Defendants entered into a Stipulation and Agreement of Compromise and Settlement, subject to the approval of the Trial Court (the “Proposed Settlement”). Under the terms of the Proposed Settlement, the lawsuit would be dismissed, and related claims against the Defendants would be released by the Plaintiffs, if BPHC, the sole member of the General Partner, elected to cause the General Partner to exercise its right to purchase the issued and outstanding common units of Boardwalk Pipelines pursuant to Boardwalk Pipelines’ Third Amended and Restated Agreement of Limited Partnership, as amended (“Limited Partnership Agreement”), within a period specified by the Proposed Settlement. On June 29, 2018, the General Partner elected to exercise its right to purchase all of the issued and outstanding common units representing limited partnership interests in Boardwalk Pipelines not already owned by the General Partner or its affiliates pursuant to the Limited Partnership Agreement within the period specified by the Proposed Settlement. The transaction was completed on July 18, 2018. On September 28, 2018, the Trial Court denied approval of the Proposed Settlement. On February 11, 2019, a substitute verified class action complaint was filed in this proceeding, which among other things, added the Parent Company as a Defendant. The Defendants filed a motion to dismiss, which was heard by the Trial Court in July of 2019. In October of 2019, the Trial Court ruled on the motion and granted a partial dismissal, with certain aspects of the case proceeding to trial. A trial was held the week of February 22, 2021 and post-trial oral arguments were held on July 14, 2021. On November 12, 2021, the Trial Court issued a ruling in the case. The Trial Court held that the General Partner breached the Limited Partnership Agreement and awarded Plaintiffs approximately $690 million, plus pre-judgment interest (approximately $166 million), post-judgment interest and attorneys’ fees. The Company believed that the Trial Court ruling included factual and legal errors. Therefore, on January 3, 2022, the Defendants appealed the Trial Court’s ruling to the Supreme Court of the State of Delaware (the “Supreme Court”). On January 17, 2022, the Plaintiffs filed a cross-appeal to the Supreme Court contesting the calculation of damages by the Trial Court. Oral arguments were held on September 14, 2022, and on December 19, 2022, the Supreme Court reversed the Trial Court’s ruling and remanded the case to the Trial Court for further proceedings related to claims not decided by the Trial Court’s ruling. Briefing by the parties at the Trial Court on the remanded issues was completed in September 2023. A hearing on the remanded issues was held at the Trial Court in April 2024. Other Litigation The Company is from time to time party to other litigation arising in the ordinary course of business. While it is difficult to predict the outcome or effect of any litigation, management does not believe that the outcome of any pending litigation, including the Boardwalk Pipelines matter described above, will materially affect the Company’s results of operations or equity.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies CNA Guarantees CNA has provided guarantees, if the primary obligor fails to perform, to holders of structured settlement annuities issued by a previously owned subsidiary. As of March 31, 2024, the potential amount of future payments CNA could be required to pay under these guarantees was approximately $1.5 billion, which will be paid over the lifetime of the annuitants. CNA does not believe any payment is likely under these guarantees, as CNA is the beneficiary of a trust that must be maintained at a level that approximates the discounted reserves for these annuities.

Segments

Segments	3 Months Ended
	Mar. 31, 2024
Segment Reporting [Abstract]
Segments	Segments Loews Corporation has four reportable segments comprised of three individual consolidated operating subsidiaries, CNA, Boardwalk Pipelines and Loews Hotels & Co; and the Corporate segment. The Corporate segment is primarily comprised of Loews Corporation, excluding its subsidiaries, and the equity method of accounting for Altium Packaging LLC. Each of the operating subsidiaries is headed by a chief executive officer who is responsible for the operation of its business and has the duties and authority commensurate with that position. For additional disclosures regarding the composition of Loews Corporation’s segments, see Note 21 of the Consolidated Financial Statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023. The following tables present the reportable segments and their contribution to the Consolidated Condensed Statements of Operations. Amounts presented will not necessarily be the same as those in the individual financial statements of the subsidiaries due to adjustments for purchase accounting, income taxes and noncontrolling interests. Statements of Operations by segment are presented in the following tables. Three Months Ended March 31, 2024 CNA Financial Boardwalk Pipelines Loews Hotels & Co Corporate Total (In millions) Revenues: Insurance premiums $ 2,441 $ 2,441 Net investment income 609 $ 4 $ 2 $ 54 669 Investment losses (22) (22) Non-insurance warranty revenue 407 407 Operating revenues and other 9 513 214 736 Total 3,444 517 216 54 4,231 Expenses: Insurance claims and policyholders’ benefits 1,807 1,807 Amortization of deferred acquisition costs 444 444 Non-insurance warranty expense 394 394 Operating expenses and other 337 312 209 22 880 Equity method (income) loss (27) 1 (26) Interest 35 43 6 19 103 Total 3,017 355 188 42 3,602 Income before income tax 427 162 28 12 629 Income tax expense (89) (41) (12) (2) (144) Net income 338 121 16 10 485 Amounts attributable to noncontrolling interests (28) (28) Net income attributable to Loews Corporation $ 310 $ 121 $ 16 $ 10 $ 457 Three Months Ended March 31, 2023 CNA Financial Boardwalk Pipelines Loews Hotels & Co Corporate Total (In millions) Revenues: Insurance premiums $ 2,248 $ 2,248 Net investment income 525 $ 1 $ 1 $ 42 569 Investment losses (35) (35) Non-insurance warranty revenue 407 407 Operating revenues and other 7 396 191 594 Total 3,152 397 192 42 3,783 Expenses: Insurance claims and policyholders’ benefits 1,653 1,653 Amortization of deferred acquisition costs 379 379 Non-insurance warranty expense 384 384 Operating expenses and other 337 242 183 19 781 Equity method (income) loss (31) 3 (28) Interest 28 39 6 22 95 Total 2,781 281 158 44 3,264 Income (loss) before income tax 371 116 34 (2) 519 Income tax expense (74) (30) (10) (1) (115) Net income (loss) 297 86 24 (3) 404 Amounts attributable to noncontrolling interests (29) (29) Net income (loss) attributable to Loews Corporation $ 268 $ 86 $ 24 $ (3) $ 375

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pay vs Performance Disclosure
Net Income (Loss)	$ 457	$ 375

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Mar. 31, 2024 shares
Trading Arrangements, by Individual
Material Terms of Trading Arrangement
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Jonathan M. Tisch [Member]
Trading Arrangements, by Individual
Name	Jonathan M. Tisch
Title	Co-Chairman of the Board and a member of the Office of the President, and Executive Chairman
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	February 22, 2024
RSUs Vesting On February 6, 2025 [Member] | Jonathan M. Tisch [Member]
Trading Arrangements, by Individual
Arrangement Duration	22 days
Aggregate Available	8,258
RSUs Vesting On February 7, 2025 [Member] | Jonathan M. Tisch [Member]
Trading Arrangements, by Individual
Arrangement Duration	21 days
Aggregate Available	8,224

Basis of Presentation (Policies

Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2024
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation Loews Corporation is a holding company. Its consolidated operating subsidiaries are engaged in the following lines of business: commercial property and casualty insurance (CNA Financial Corporation (“CNA”), an approximately 92% owned subsidiary); transportation and storage of natural gas and natural gas liquids and other hydrocarbons (Boardwalk Pipeline Partners, LP (“Boardwalk Pipelines”), a wholly owned subsidiary) and the operation of a chain of hotels (Loews Hotels Holding Corporation (“Loews Hotels & Co”), a wholly owned subsidiary). Unless the context otherwise requires, as used herein, the term “Company” means Loews Corporation including its consolidated subsidiaries, the term “Parent Company” means Loews Corporation excluding its subsidiaries, the term “Net income (loss) attributable to Loews Corporation” means Net income (loss) attributable to Loews Corporation shareholders and the term “subsidiaries” means Loews Corporation’s consolidated subsidiaries. In the opinion of management, the accompanying unaudited Consolidated Condensed Financial Statements reflect all adjustments (consisting of normal recurring accruals) necessary to present fairly the Company’s financial position as of March 31, 2024 and December 31, 2023 and results of operations, comprehensive income (loss), changes in shareholders’ equity and cash flows for the three months ended March 31, 2024 and 2023, in each case in accordance with accounting principles generally accepted in the United States of America (“GAAP”). Results for the interim periods are not necessarily indicative of results for the entire year. These Consolidated Condensed Financial Statements should be read in conjunction with the Consolidated Financial Statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023. The Company presents basic and diluted net income (loss) per share on the Consolidated Condensed Statements of Operations. Basic net income (loss) per share excludes dilution and is computed by dividing net income (loss) attributable to common stock by the weighted average number of common shares outstanding for the period. Diluted net income per share reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock. For the three months ended March 31, 2024 and 2023 there were no shares attributable to employee stock-based compensation awards excluded from the diluted weighted average shares outstanding amounts because the effect would have been antidilutive. Recently issued Accounting Standards Updates (“ASUs”) - In November of 2023, the Financial Accounting Standards Board (“FASB”) issued ASU 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures.” The updated accounting guidance requires enhanced reportable segment disclosures, primarily related to significant segment expenses which are regularly provided to the chief operating decision maker. The guidance is effective for fiscal years beginning after December 15, 2023 and interim periods within fiscal years beginning after December 15, 2024. Retrospective application is required and early adoption is permitted. The Company is currently evaluating the effect the updated guidance will have on its financial statement disclosures. In December of 2023, the FASB issued ASU 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures.” The updated accounting guidance requires expanded income tax disclosures, including the disaggregation of existing disclosures related to the effective tax rate reconciliation and income taxes paid. The guidance is effective for fiscal years beginning after December 15, 2024. Prospective application is required, with retrospective application permitted. The Company is currently evaluating the effect the updated guidance will have on its financial statement disclosures.

Investments (Tables)

Investments (Tables)	3 Months Ended
	Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Schedule of Net Investment Income	Net investment income is as follows: Three Months Ended March 31 2024 2023 (In millions) Fixed maturity securities $ 502 $ 470 Limited partnership investments 54 27 Short-term investments 29 16 Equity securities (a) 22 12 Income from trading portfolio (a) 58 45 Other 28 20 Total investment income 693 590 Investment expenses (24) (21) Net investment income $ 669 $ 569 (a) Net investment income recognized due to the change in fair value of equity and trading portfolio securities held as of March 31, 2024 and 2023 $ 48 $ 11
Schedule of Investment Gains (Losses)	Investment gains (losses) are as follows: Three Months Ended March 31 2024 2023 (In millions) Fixed maturity securities: Gross gains $ 14 $ 35 Gross losses (46) (57) Investment losses on fixed maturity securities (32) (22) Equity securities (a) 11 (14) Short-term investments and other (1) 1 Investment losses $ (22) $ (35) (a) Investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock included within equity securities held as of March 31, 2024 and 2023 $ 11 $ (2)
Schedule of Impairment Losses (Gains) on Earnings	The available-for-sale impairment losses (gains) recognized in earnings by asset type are presented in the following table. The table includes losses (gains) on securities with an intention to sell and changes in the allowance for credit losses on securities since acquisition date: Three Months Ended March 31 2024 2023 (In millions) Fixed maturity securities available-for-sale: Corporate and other bonds $ 9 $ 8 Asset-backed 5 Impairment losses recognized in earnings $ 14 $ 8
Schedule of Amortized Cost and Fair Values of Fixed Maturity Securities	The following tables present a summary of fixed maturity securities: March 31, 2024 Cost or Amortized Cost Gross Unrealized Gross Unrealized Allowance Estimated (In millions) Fixed maturity securities: Corporate and other bonds $ 25,221 $ 485 $ 1,374 $ 3 $ 24,329 States, municipalities and political 7,726 318 756 7,288 Asset-backed: Residential mortgage-backed 3,563 10 483 3,090 Commercial mortgage-backed 1,838 8 193 8 1,645 Other asset-backed 3,586 19 251 9 3,345 Total asset-backed 8,987 37 927 17 8,080 U.S. Treasury and obligations of 181 2 179 Foreign government 763 3 37 729 Fixed maturities available-for-sale $ 42,878 $ 843 $ 3,096 $ 20 $ 40,605 Fixed maturities trading 235 235 Total fixed maturity securities $ 43,113 $ 843 $ 3,096 $ 20 $ 40,840 December 31, 2023 Fixed maturity securities: Corporate and other bonds $ 25,020 $ 597 $ 1,345 $ 4 $ 24,268 States, municipalities and political 7,713 382 703 7,392 Asset-backed: Residential mortgage-backed 3,411 16 425 3,002 Commercial mortgage-backed 1,862 7 230 8 1,631 Other asset-backed 3,515 13 256 4 3,268 Total asset-backed 8,788 36 911 12 7,901 U.S. Treasury and obligations of 152 1 2 151 Foreign government 741 6 34 713 Fixed maturities available-for-sale $ 42,414 $ 1,022 $ 2,995 $ 16 $ 40,425 Fixed maturities trading 201 201 Total fixed maturity securities $ 42,615 $ 1,022 $ 2,995 $ 16 $ 40,626
Schedule of Available-for-sale Fixed Maturity Securities in Gross Unrealized Loss Position	The available-for-sale fixed maturity securities in a gross unrealized loss position for which an allowance for credit losses has not been recorded are as follows: Less than 12 Months 12 Months or Longer Total March 31, 2024 Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses (In millions) Fixed maturity securities: Corporate and other bonds $ 2,578 $ 48 $ 13,459 $ 1,326 $ 16,037 $ 1,374 States, municipalities and political 686 17 3,266 739 3,952 756 Asset-backed: Residential mortgage-backed 434 8 2,159 475 2,593 483 Commercial mortgage-backed 131 2 1,162 191 1,293 193 Other asset-backed 588 9 1,833 242 2,421 251 Total asset-backed 1,153 19 5,154 908 6,307 927 U.S. Treasury and obligations of 100 1 28 1 128 2 Foreign government 136 2 452 35 588 37 Total fixed maturity securities $ 4,653 $ 87 $ 22,359 $ 3,009 $ 27,012 $ 3,096 December 31, 2023 Fixed maturity securities: Corporate and other bonds $ 1,943 $ 37 $ 13,406 $ 1,308 $ 15,349 $ 1,345 States, municipalities and political 598 18 3,104 685 3,702 703 Asset-backed: Residential mortgage-backed 233 4 2,212 421 2,445 425 Commercial mortgage-backed 200 5 1,184 225 1,384 230 Other asset-backed 392 8 1,869 248 2,261 256 Total asset-backed 825 17 5,265 894 6,090 911 U.S. Treasury and obligations of 65 1 23 1 88 2 Foreign government 52 1 450 33 502 34 Total fixed maturity securities $ 3,483 $ 74 $ 22,248 $ 2,921 $ 25,731 $ 2,995 The following table presents the estimated fair value and gross unrealized losses of available-for-sale fixed maturity securities in a gross unrealized loss position for which an allowance for credit loss has not been recorded, by ratings distribution. March 31, 2024 December 31, 2023 Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses (In millions) U.S. Government, Government agencies and Government-sponsored enterprises $ 2,426 $ 361 $ 2,273 $ 309 AAA 1,661 280 1,524 261 AA 4,109 690 3,817 658 A 6,324 570 5,652 517 BBB 11,672 1,083 11,523 1,095 Non-investment grade 820 112 942 155 Total $ 27,012 $ 3,096 $ 25,731 $ 2,995
Schedule of Allowance for Credit Losses	The following tables present the activity related to the allowance on available-for-sale securities with credit impairments and purchased credit-deteriorated (“PCD”) assets. Accrued interest receivables on available-for-sale fixed maturity securities totaled $437 million, $435 million and $407 million as of March 31, 2024, December 31, 2023 and March 31, 2023 and are excluded from the estimate of expected credit losses and the amortized cost basis in the tables within this Note. Three months ended March 31, 2024 Corporate and Other Bonds Asset-backed Total (In millions) Allowance for credit losses: Balance as of January 1, 2024 $ 4 $ 12 $ 16 Additions to the allowance for credit losses: Available-for-sale securities accounted for as PCD assets — Reductions to the allowance for credit losses: Securities sold during the period (realized) — Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis 1 1 Additional increases to the allowance for credit losses on securities that had an allowance recorded in a previous period 5 5 Total allowance for credit losses $ 3 $ 17 $ 20 Three months ended March 31, 2023 Corporate and Other Bonds Asset-backed Total (In millions) Allowance for credit losses: Balance as of January 1, 2023 $ — $ 1 $ 1 Additions to the allowance for credit losses: Available-for-sale securities accounted for as PCD assets 9 9 Reductions to the allowance for credit losses: Securities sold during the period (realized) 6 6 Intent to sell or more likely than not will be required to sell the 3 3 Additional increases to the allowance for credit losses on securities that had an allowance recorded in a previous period 1 1 Total allowance for credit losses $ 1 $ 1 $ 2
Schedule of Available-for-sale Fixed Maturity Securities by Contractual Maturity	The following table presents available-for-sale fixed maturity securities by contractual maturity. March 31, 2024 December 31, 2023 Cost or Amortized Cost Estimated Fair Cost or Amortized Cost Estimated (In millions) Due in one year or less $ 1,238 $ 1,207 $ 1,121 $ 1,091 Due after one year through five years 11,680 11,308 11,563 11,180 Due after five years through ten years 13,283 12,461 13,359 12,573 Due after ten years 16,677 15,629 16,371 15,581 Total $ 42,878 $ 40,605 $ 42,414 $ 40,425
Schedule of Amortized Cost Basis of Mortgage Loans for Each Credit Quality Indicator by Year of Origination	The following table presents the amortized cost basis of mortgage loans for each credit quality indicator by year of origination. The primary credit quality indicators utilized are debt service coverage ratios (“DSCR”) and loan-to-value (“LTV”) ratios. Mortgage Loans Amortized Cost Basis by Origination Year (a) As of March 31, 2024 2024 2023 2022 2021 2020 Prior Total (In millions) DSCR ≥1.6x LTV less than 55% $ 33 $ 9 $ 2 $ 97 $ 283 $ 424 LTV 55% to 65% 5 5 LTV greater than 65% 30 12 42 DSCR 1.2x - 1.6x LTV less than 55% 28 5 13 63 109 LTV 55% to 65% $ 12 21 36 36 24 31 160 LTV greater than 65% 12 65 77 DSCR ≤1.2x LTV less than 55% — LTV 55% to 65% 32 75 43 150 LTV greater than 65% 28 21 48 97 Total $ 12 $ 126 $ 248 $ 76 $ 134 $ 468 $ 1,064 (a) The values in the table above reflect DSCR on a standardized amortization period and LTV ratios based on the most recent appraised values trended forward using changes in a commercial real estate price index.
Schedule of Aggregate Contractual or Notional Amounts and Estimated Fair Values Related to Derivative Financial Instruments	A summary of the aggregate contractual or notional amounts and gross estimated fair values related to derivative financial instruments follows. The contractual or notional amounts for derivatives are used to calculate the exchange of contractual payments under related agreements and may not be representative of the potential for gain or loss on these instruments. Gross estimated fair values of derivative positions are currently presented in Equity securities, Receivables and Payable to brokers on the Consolidated Condensed Balance Sheets. March 31, 2024 December 31, 2023 Contractual/Notional Amount Estimated Fair Value Contractual/Notional Amount Estimated Fair Value Asset (Liability) Asset (Liability) (In millions) Without hedge designation: Equity markets: Options – purchased $ 235 $ 1 $ 202 $ 1 Futures – short 127 116 Warrants 84 3 84 3 Interest rate swaps 300 12 300 13 Currency forwards 13 $ (1)

Fair Value (Tables)

Fair Value (Tables)	3 Months Ended
	Mar. 31, 2024
Fair Value Disclosures [Abstract]
Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis	Assets and liabilities measured at fair value on a recurring basis are summarized in the following tables. Corporate bonds and other includes obligations of the United States of America (“U.S.”) Treasury, government-sponsored enterprises, foreign governments and redeemable preferred stock. March 31, 2024 Level 1 Level 2 Level 3 Total (In millions) Fixed maturity securities: Corporate bonds and other $ 189 $ 23,966 $ 1,082 $ 25,237 States, municipalities and political subdivisions 7,245 43 7,288 Asset-backed 7,209 871 8,080 Fixed maturities available-for-sale 189 38,420 1,996 40,605 Fixed maturities trading 235 235 Total fixed maturities $ 424 $ 38,420 $ 1,996 $ 40,840 Equity securities $ 654 $ 439 $ 11 $ 1,104 Short-term and other 5,203 19 5,222 Receivables 12 12 Payable to brokers (38) (38) December 31, 2023 Fixed maturity securities: Corporate bonds and other $ 161 $ 23,926 $ 1,045 $ 25,132 States, municipalities and political subdivisions 7,348 44 7,392 Asset-backed 7,000 901 7,901 Fixed maturities available-for-sale 161 38,274 1,990 40,425 Fixed maturities trading 201 201 Total fixed maturities $ 362 $ 38,274 $ 1,990 $ 40,626 Equity securities $ 586 $ 440 $ 24 $ 1,050 Short-term and other 4,215 32 4,247 Receivables 13 13 Payable to brokers (62) (62)
Schedule of Reconciliations of Assets and Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs	The following tables present reconciliations for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the three months ended March 31, 2024 and 2023: Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses) Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at March 31 Unrealized Gains (Losses) Recognized in Other Comprehensive Income (Loss) on Level 3 Assets and Liabilities Held at March 31 2024 Balance, January 1 Included in Net Income Included in OCI Purchases Sales Settlements Transfers into Transfers out of Level 3 Balance, March 31 (In millions) Fixed maturity securities: Corporate bonds and other $ 1,045 $ (12) $ 74 $ (36) $ 11 $ 1,082 $ (14) States, municipalities and political subdivisions 44 (1) 43 (1) Asset-backed 901 $ 2 (5) 18 $ (9) (17) $ (19) 871 (5) Fixed maturities available-for-sale $ 1,990 $ 2 $ (18) $ 92 $ (9) $ (53) $ 11 $ (19) $ 1,996 $ — $ (20) Equity securities $ 24 $ 6 $ (19) $ 11 $ 1 Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses) Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at March 31 Unrealized Gains (Losses) Recognized in Other Comprehensive Income (Loss) on Level 3 Assets and Liabilities Held at March 31 2023 Balance, January 1 Included in Net Income Included in OCI Purchases Sales Settlements Transfers into Transfers out of Level 3 Balance, March 31 (In millions) Fixed maturity securities: Corporate bonds and other $ 810 $ 24 $ 81 $ (3) $ 912 $ 24 States, municipalities and political subdivisions 43 1 44 1 Asset-backed 788 $ 5 7 55 (9) $ 23 $ (10) 859 7 Fixed maturities available-for-sale $ 1,641 $ 5 $ 32 $ 136 $ — $ (12) $ 23 $ (10) $ 1,815 $ — $ 32 Equity securities $ 35 $ (6) $ 29 $ (6) Net investment gains and losses are reported in Net income as follows: Major Category of Assets and Liabilities Consolidated Condensed Statements of Operations Line Items Fixed maturity securities available-for-sale Investment gains (losses) Fixed maturity securities trading Net investment income Equity securities Investment gains (losses) and Net investment income Other invested assets Investment gains (losses) and Net investment income Derivative financial instruments held in a trading portfolio Net investment income Derivative financial instruments, other Investment gains (losses) and Operating revenues and other
Schedule of Significant Unobservable Inputs	The following tables present quantitative information about the significant unobservable inputs utilized in the fair value measurement of Level 3 assets. Valuations for assets and liabilities not presented in the tables below are primarily based on broker/dealer quotes for which there is a lack of transparency as to inputs used to develop the valuations. The quantitative detail of unobservable inputs from these broker quotes is neither provided nor reasonably available. The weighted average rate is calculated based on fair value. March 31, 2024 Estimated Valuation Techniques Unobservable Inputs Range (Weighted Average) (In millions) Fixed maturity securities $ 1,521 Discounted cash flow Credit spread 1 % — 7 % (2 %) December 31, 2023 Fixed maturity securities $ 1,495 Discounted cash flow Credit spread 1 % — 7 % (2 %)
Schedule of Financial Assets and Liabilities not Measured at Fair Value	The carrying amount, estimated fair value and the level of the fair value hierarchy of the financial assets and liabilities which are not measured at fair value on the Consolidated Condensed Balance Sheets are presented in the following tables. The carrying amounts and estimated fair values of short-term debt and long-term debt exclude finance lease obligations. The carrying amounts reported on the Consolidated Condensed Balance Sheets for cash and short-term investments not carried at fair value and certain other assets and liabilities approximate fair value due to the short-term nature of these items. Carrying Amount Estimated Fair Value March 31, 2024 Level 1 Level 2 Level 3 Total (In millions) Assets: Other invested assets, primarily mortgage loans $ 1,029 $ 987 $ 987 Liabilities: Short-term debt 1,677 $ 1,145 519 1,664 Long-term debt 8,422 7,663 431 8,094 December 31, 2023 Assets: Other invested assets, primarily mortgage loans $ 1,035 $ 997 $ 997 Liabilities: Short-term debt 1,083 $ 546 520 1,066 Long-term debt 7,915 7,255 385 7,640

Claim and Claim Adjustment Ex_2

Claim and Claim Adjustment Expense Reserves (Tables)	3 Months Ended
	Mar. 31, 2024
Insurance [Abstract]
Schedule of Reconciliation of Claim and Claim Adjustment Expense Reserves	The following table presents a reconciliation between beginning and ending claim and claim adjustment expense reserves. Three Months Ended March 31 2024 2023 (In millions) Reserves, beginning of year: Gross $ 23,304 $ 22,120 Ceded 5,141 5,191 Net reserves, beginning of year 18,163 16,929 Net incurred claim and claim adjustment expenses: Provision for insured events of current year 1,502 1,326 Increase (decrease) in provision for insured events of prior years (6) 13 Amortization of discount 10 11 Total net incurred (a) 1,506 1,350 Net payments attributable to: Current year events (113) (72) Prior year events (1,168) (1,042) Total net payments (1,281) (1,114) Foreign currency translation adjustment and other (41) 35 Net reserves, end of period 18,347 17,200 Ceded reserves, end of period 5,241 5,209 Gross reserves, end of period $ 23,588 $ 22,409 (a) Total net incurred does not agree to Insurance claims and policyholders’ benefits as reflected on the Consolidated Condensed Statements of Operations due to amounts related to retroactive reinsurance deferred gain accounting, uncollectible reinsurance, benefit expenses related to future policy benefits and policyholders’ dividends, which are not reflected in the table above.
Schedule of Net Prior Year Loss Reserve Development in Property and Casualty Operations	The following table and discussion present details of the net prior year loss reserve development in Property & Casualty Operations: Three Months Ended March 31 2024 2023 (In millions) Medical professional liability $ 9 Surety $ (18) Warranty 13 (9) Workers’ compensation (2) (2) Other property and casualty operations 15 Total pretax (favorable) unfavorable development $ (7) $ 13

Future Policy Benefits Reserv_2

Future Policy Benefits Reserves (Tables)	3 Months Ended
	Mar. 31, 2024
Insurance [Abstract]
Schedule of Liability for Future Policy Benefit	2024 2023 (In millions) Present value of future net premiums Balance, January 1 $ 3,710 $ 3,993 Effect of changes in discount rate (125) (74) Balance, January 1, at original locked in discount rate 3,585 3,919 Effect of changes in cash flow assumptions (a) Effect of actual variances from expected experience (a) (28) (49) Adjusted balance, January 1 3,557 3,870 Interest accrual 47 52 Net premiums: earned during period (107) (111) Balance, end of period at original locked in discount rate 3,497 3,811 Effect of changes in discount rate 56 154 Balance, March 31 $ 3,553 $ 3,965 Present value of future benefits & expenses Balance, January 1 $ 17,669 $ 17,472 Effect of changes in discount rate (578) (125) Balance, January 1, at original locked in discount rate 17,091 17,347 Effect of changes in cash flow assumptions (a) Effect of actual variances from expected experience (a) (13) (50) Adjusted balance, January 1 17,078 17,297 Interest accrual 231 242 Benefit & expense payments (321) (302) Balance, end of period at original locked in discount rate 16,988 17,237 Effect of changes in discount rate 78 704 Balance, March 31 $ 17,066 $ 17,941 Net LFPB, March 31 $ 13,513 $ 13,976 (a) As of March 31, 2024 and 2023 , the re-measurement gain (loss) of $(15) million and $1 million presented parenthetically on the Consolidated Condensed Statement of Operations is comprised of the effect of changes in cash flow assumptions and the effect of actual variances from expected experience. The following table presents earned premiums and interest expense associated with the long-term care business recognized on the Condensed Consolidated Statement of Operations. Three Months Ended March 31 2024 2023 (In millions) Earned premiums $ 110 $ 115 Interest expense 184 190 The following table presents undiscounted expected future benefit and expense payments and undiscounted expected future gross premiums. March 31, 2024 2023 (In millions) Expected future benefit and expense payments $ 32,474 $ 33,759 Expected future gross premiums 5,270 5,729 The weighted average interest rates in the table below are calculated based on the rate used to discount all future cash flows. March 31, December 31, 2024 2023 2023 Original locked in discount rate 5.22 % 5.26 % 5.22 % Upper-medium grade fixed income instrument discount rate 5.20 4.92 4.94

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	3 Months Ended
	Mar. 31, 2024
Equity [Abstract]
Schedule of Components of Accumulated Other Comprehensive Income	The tables below present the changes in Accumulated other comprehensive income (loss) (“AOCI”) by component for the three months ended March 31, 2023 and 2024 : Net Unrealized Gains (Losses) on Investments with an Allowance for Credit Losses Net Unrealized Gains (Losses) on Other Investments Cumulative Unrealized Gains (Losses) on Cash Flow Hedges Pension and Postretirement Benefits Foreign Currency Translation Total Accumulated Other Comprehensive Income (Loss) (In millions) Balance, January 1, 2023, as reported $ (7) $ (2,469) $ — $ 14 $ (622) $ (200) $ (3,284) Cumulative effect adjustments from changes in accounting standard s, after tax of $0, $0, $11, $0, $0 and $0 (36) (36) Balance, January 1, 2023, as adjusted (7) (2,469) (36) 14 (622) (200) (3,320) Other comprehensive income (loss) before reclassifications, after tax of $2, $(176), $105, $1, $0 and $0 (8) 652 (396) (2) 16 262 Reclassification of losses from accumulated other comprehensive loss, after tax of $0, $(4), $0, $0, $(2) and $0 18 9 27 Other comprehensive income (loss) (8) 670 (396) (2) 9 16 289 Amounts attributable to noncontrolling interests 1 (68) 39 (1) (2) (31) Balance, March 31, 2023 $ (14) $ (1,867) $ (393) $ 12 $ (614) $ (186) $ (3,062) Balance, January 1, 2024 $ (12) $ (1,483) $ (329) $ 9 $ (533) $ (149) $ (2,497) Other comprehensive income (loss) before reclassifications, after tax of $0, $64, $(91), $(1), $0 and $0 (1) (239) 341 2 (33) 70 Reclassification of losses from accumulated other comprehensive loss, after tax of $(1), $(6), $0, $0, $(1) and $0 3 22 6 31 Other comprehensive income (loss) 2 (217) 341 2 6 (33) 101 Amounts attributable to noncontrolling interests 19 (29) (1) 3 (8) Other 1 5 (1) (2) 3 Balance, March 31, 2024 $ (9) $ (1,676) $ (17) $ 10 $ (530) $ (179) $ (2,401)
Schedule of Reclassification out of Accumulated Other Comprehensive Income	Amounts reclassified from AOCI shown above are reported in Net income (loss) as follows: Major Category of AOCI Affected Line Item Net unrealized gains (losses) on investments with an allowance for credit losses and Net unrealized gains (losses) on other investments Investment gains (losses) Unrealized gains (losses) on cash flow hedges Operating revenues and other, Interest expense and Operating expenses and other Pension and postretirement benefits Operating expenses and other

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	3 Months Ended
	Mar. 31, 2024
Revenue from Contract with Customer [Abstract]
Schedule of Disaggregation of Revenue	The following table presents revenues from contracts with customers disaggregated by revenue type along with the reportable segment and a reconciliation to Operating revenues and other as reported in Note 12 : Three Months Ended March 31 2024 2023 (In millions) Non-insurance warranty – CNA Financial $ 407 $ 407 Transportation and storage of natural gas and NGLs and ethane supply and transportation services – Boardwalk Pipelines $ 501 $ 386 Lodging and related services – Loews Hotels & Co 209 185 Total revenues from contracts with customers 710 571 Other revenues 26 23 Operating revenues and other $ 736 $ 594

Benefit Plans (Tables)

Benefit Plans (Tables)	3 Months Ended
	Mar. 31, 2024
Retirement Benefits [Abstract]
Schedule of Net Periodic (Benefit) Cost Components	The following table presents the components of net periodic (benefit) cost for the defined benefit plans: Pension Benefits Other Postretirement Benefits Three Months Ended March 31 2024 2023 2024 2023 (In millions) Service cost $ 1 $ 1 Interest cost 24 28 $ 1 $ 1 Expected return on plan assets (29) (32) (1) (1) Amortization of unrecognized net loss 7 9 Net periodic cost $ 3 $ 6 $ — $ —

Segments (Tables)

Segments (Tables)	3 Months Ended
	Mar. 31, 2024
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	Statements of Operations by segment are presented in the following tables. Three Months Ended March 31, 2024 CNA Financial Boardwalk Pipelines Loews Hotels & Co Corporate Total (In millions) Revenues: Insurance premiums $ 2,441 $ 2,441 Net investment income 609 $ 4 $ 2 $ 54 669 Investment losses (22) (22) Non-insurance warranty revenue 407 407 Operating revenues and other 9 513 214 736 Total 3,444 517 216 54 4,231 Expenses: Insurance claims and policyholders’ benefits 1,807 1,807 Amortization of deferred acquisition costs 444 444 Non-insurance warranty expense 394 394 Operating expenses and other 337 312 209 22 880 Equity method (income) loss (27) 1 (26) Interest 35 43 6 19 103 Total 3,017 355 188 42 3,602 Income before income tax 427 162 28 12 629 Income tax expense (89) (41) (12) (2) (144) Net income 338 121 16 10 485 Amounts attributable to noncontrolling interests (28) (28) Net income attributable to Loews Corporation $ 310 $ 121 $ 16 $ 10 $ 457 Three Months Ended March 31, 2023 CNA Financial Boardwalk Pipelines Loews Hotels & Co Corporate Total (In millions) Revenues: Insurance premiums $ 2,248 $ 2,248 Net investment income 525 $ 1 $ 1 $ 42 569 Investment losses (35) (35) Non-insurance warranty revenue 407 407 Operating revenues and other 7 396 191 594 Total 3,152 397 192 42 3,783 Expenses: Insurance claims and policyholders’ benefits 1,653 1,653 Amortization of deferred acquisition costs 379 379 Non-insurance warranty expense 384 384 Operating expenses and other 337 242 183 19 781 Equity method (income) loss (31) 3 (28) Interest 28 39 6 22 95 Total 2,781 281 158 44 3,264 Income (loss) before income tax 371 116 34 (2) 519 Income tax expense (74) (30) (10) (1) (115) Net income (loss) 297 86 24 (3) 404 Amounts attributable to noncontrolling interests (29) (29) Net income (loss) attributable to Loews Corporation $ 268 $ 86 $ 24 $ (3) $ 375

Basis of Presentation (Details)

Basis of Presentation (Details) - shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
CNA
Basis of Presentation [Abstract]
Subsidiary ownership (as a percent)	92%
Share-Based Payment Arrangement
Basis of Presentation [Abstract]
Shares excluded from diluted EPS calculation (in shares)	0	0

Investments - Net Investment In

Investments - Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Net Investment Income [Line Items]
Investment income, operating	$ 693	$ 590
Investment expenses	(24)	(21)
Net investment income	669	569
Net investment income recognized due to the change in fair value of equity and trading portfolio securities held as of March 31, 2024 and 2023	48	11
Fixed maturity securities
Net Investment Income [Line Items]
Investment income, operating	502	470
Limited partnership investments
Net Investment Income [Line Items]
Gain (losses) on investments, before investment expenses	54	27
Short-term investments
Net Investment Income [Line Items]
Investment income, operating	29	16
Equity securities
Net Investment Income [Line Items]
Gain (losses) on investments, before investment expenses	22	12
Income from trading portfolio
Net Investment Income [Line Items]
Gain (losses) on investments, before investment expenses	58	45
Other
Net Investment Income [Line Items]
Investment income, operating	$ 28	$ 20

Investments - Investment Gains

Investments - Investment Gains (Losses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Investment Gains (Losses) [Abstract]
Investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock included within equity securities held as of March 31, 2024 and 2023	$ (22)	$ (35)
Nonredeemable Preferred Stock
Investment Gains (Losses) [Abstract]
Investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock included within equity securities held as of March 31, 2024 and 2023	11	(2)
Fixed maturity securities
Investment Gains (Losses) [Abstract]
Gross gains	14	35
Gross losses	(46)	(57)
Investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock included within equity securities held as of March 31, 2024 and 2023	(32)	(22)
Equity securities
Investment Gains (Losses) [Abstract]
Investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock included within equity securities held as of March 31, 2024 and 2023	11	(14)
Short-term investments and other
Investment Gains (Losses) [Abstract]
Investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock included within equity securities held as of March 31, 2024 and 2023	$ (1)	$ 1

Investments - Available-for-sal

Investments - Available-for-sale Impairment Losses Recognized in Earnings (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Available-For-Sale Impairment Losses [Abstract]
Impairment losses recognized in earnings	$ 14	$ 8
Mortgage Receivable
Available-For-Sale Impairment Losses [Abstract]
Gain (loss) on mortgage loans due to changes in expected credit losses	0	0
Corporate and other bonds
Available-For-Sale Impairment Losses [Abstract]
Impairment losses recognized in earnings	9	8
Asset-backed
Available-For-Sale Impairment Losses [Abstract]
Impairment losses recognized in earnings	$ 5

Investments - Amortized Cost an

Investments - Amortized Cost and Fair Values of Fixed Maturity Securities (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]
Cost or Amortized Cost	$ 43,113	$ 42,615
Gross Unrealized Gains	843	1,022
Gross Unrealized Losses	3,096	2,995
Allowance for Credit Losses	20	16
Estimated Fair Value	40,840	40,626
Corporate and other bonds
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]
Cost or Amortized Cost	25,221	25,020
Gross Unrealized Gains	485	597
Gross Unrealized Losses	1,374	1,345
Allowance for Credit Losses	3	4
Estimated Fair Value	24,329	24,268
States, municipalities and political subdivisions
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]
Cost or Amortized Cost	7,726	7,713
Gross Unrealized Gains	318	382
Gross Unrealized Losses	756	703
Allowance for Credit Losses
Estimated Fair Value	7,288	7,392
Residential mortgage-backed
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]
Cost or Amortized Cost	3,563	3,411
Gross Unrealized Gains	10	16
Gross Unrealized Losses	483	425
Allowance for Credit Losses
Estimated Fair Value	3,090	3,002
Commercial mortgage-backed
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]
Cost or Amortized Cost	1,838	1,862
Gross Unrealized Gains	8	7
Gross Unrealized Losses	193	230
Allowance for Credit Losses	8	8
Estimated Fair Value	1,645	1,631
Other asset-backed
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]
Cost or Amortized Cost	3,586	3,515
Gross Unrealized Gains	19	13
Gross Unrealized Losses	251	256
Allowance for Credit Losses	9	4
Estimated Fair Value	3,345	3,268
Asset-backed
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]
Cost or Amortized Cost	8,987	8,788
Gross Unrealized Gains	37	36
Gross Unrealized Losses	927	911
Allowance for Credit Losses	17	12
Estimated Fair Value	8,080	7,901
U.S. Treasury and obligations of government-sponsored enterprises
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]
Cost or Amortized Cost	181	152
Gross Unrealized Gains		1
Gross Unrealized Losses	2	2
Allowance for Credit Losses
Estimated Fair Value	179	151
Foreign government
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]
Cost or Amortized Cost	763	741
Gross Unrealized Gains	3	6
Gross Unrealized Losses	37	34
Allowance for Credit Losses
Estimated Fair Value	729	713
Fixed maturities available-for-sale
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]
Cost or Amortized Cost	42,878	42,414
Gross Unrealized Gains	843	1,022
Gross Unrealized Losses	3,096	2,995
Allowance for Credit Losses	20	16
Estimated Fair Value	40,605	40,425
Fixed maturities trading
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]
Cost or Amortized Cost	235	201
Gross Unrealized Gains
Gross Unrealized Losses
Allowance for Credit Losses
Estimated Fair Value	$ 235	$ 201

Investments - Available-for-s_2

Investments - Available-for-sale Securities in Gross Unrealized Loss Position (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Gross Unrealized Losses [Abstract]
Total, Estimated Fair Value	$ 27,012	$ 25,731
Total, Gross Unrealized Losses	3,096	2,995
Fixed maturity securities
Gross Unrealized Losses [Abstract]
Less than 12 Months, Estimated Fair Value	4,653	3,483
Less than 12 Months, Gross Unrealized Losses	87	74
12 Months or Longer, Estimated Fair Value	22,359	22,248
12 Months or Longer, Gross Unrealized Losses	3,009	2,921
Total, Estimated Fair Value	27,012	25,731
Total, Gross Unrealized Losses	3,096	2,995
Corporate bonds and other
Gross Unrealized Losses [Abstract]
Less than 12 Months, Estimated Fair Value	2,578	1,943
Less than 12 Months, Gross Unrealized Losses	48	37
12 Months or Longer, Estimated Fair Value	13,459	13,406
12 Months or Longer, Gross Unrealized Losses	1,326	1,308
Total, Estimated Fair Value	16,037	15,349
Total, Gross Unrealized Losses	1,374	1,345
States, municipalities and political subdivisions
Gross Unrealized Losses [Abstract]
Less than 12 Months, Estimated Fair Value	686	598
Less than 12 Months, Gross Unrealized Losses	17	18
12 Months or Longer, Estimated Fair Value	3,266	3,104
12 Months or Longer, Gross Unrealized Losses	739	685
Total, Estimated Fair Value	3,952	3,702
Total, Gross Unrealized Losses	756	703
Residential mortgage-backed
Gross Unrealized Losses [Abstract]
Less than 12 Months, Estimated Fair Value	434	233
Less than 12 Months, Gross Unrealized Losses	8	4
12 Months or Longer, Estimated Fair Value	2,159	2,212
12 Months or Longer, Gross Unrealized Losses	475	421
Total, Estimated Fair Value	2,593	2,445
Total, Gross Unrealized Losses	483	425
Commercial mortgage-backed
Gross Unrealized Losses [Abstract]
Less than 12 Months, Estimated Fair Value	131	200
Less than 12 Months, Gross Unrealized Losses	2	5
12 Months or Longer, Estimated Fair Value	1,162	1,184
12 Months or Longer, Gross Unrealized Losses	191	225
Total, Estimated Fair Value	1,293	1,384
Total, Gross Unrealized Losses	193	230
Other asset-backed
Gross Unrealized Losses [Abstract]
Less than 12 Months, Estimated Fair Value	588	392
Less than 12 Months, Gross Unrealized Losses	9	8
12 Months or Longer, Estimated Fair Value	1,833	1,869
12 Months or Longer, Gross Unrealized Losses	242	248
Total, Estimated Fair Value	2,421	2,261
Total, Gross Unrealized Losses	251	256
Total asset-backed
Gross Unrealized Losses [Abstract]
Less than 12 Months, Estimated Fair Value	1,153	825
Less than 12 Months, Gross Unrealized Losses	19	17
12 Months or Longer, Estimated Fair Value	5,154	5,265
12 Months or Longer, Gross Unrealized Losses	908	894
Total, Estimated Fair Value	6,307	6,090
Total, Gross Unrealized Losses	927	911
U.S. Treasury and obligations of government-sponsored enterprises
Gross Unrealized Losses [Abstract]
Less than 12 Months, Estimated Fair Value	100	65
Less than 12 Months, Gross Unrealized Losses	1	1
12 Months or Longer, Estimated Fair Value	28	23
12 Months or Longer, Gross Unrealized Losses	1	1
Total, Estimated Fair Value	128	88
Total, Gross Unrealized Losses	2	2
Foreign government
Gross Unrealized Losses [Abstract]
Less than 12 Months, Estimated Fair Value	136	52
Less than 12 Months, Gross Unrealized Losses	2	1
12 Months or Longer, Estimated Fair Value	452	450
12 Months or Longer, Gross Unrealized Losses	35	33
Total, Estimated Fair Value	588	502
Total, Gross Unrealized Losses	$ 37	$ 34

Investments - Unrealized Loss (

Investments - Unrealized Loss (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	$ 27,012	$ 25,731
Gross Unrealized Losses	3,096	2,995
Additional impairment losses	0
AAA
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	1,661	1,524
Gross Unrealized Losses	280	261
AA
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	4,109	3,817
Gross Unrealized Losses	690	658
A
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	6,324	5,652
Gross Unrealized Losses	570	517
BBB
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	11,672	11,523
Gross Unrealized Losses	1,083	1,095
U.S. Government, Government agencies and Government-sponsored enterprises
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	2,426	2,273
Gross Unrealized Losses	361	309
Non-investment grade
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	820	942
Gross Unrealized Losses	$ 112	$ 155

Investments - Allowance for Cre

Investments - Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Accrued interest receivables on available-for-sale fixed maturity securities	$ 437	$ 407	$ 435
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	16	1
Available-for-sale securities accounted for as PCD assets	0	9
Securities sold during the period (realized)	0	6
Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis	1
Write-offs charged against the allowance		3
Additional increases to the allowance for credit losses on securities that had an allowance recorded in a previous period	5	1
Ending balance	20	2
Corporate bonds and other
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	4	0
Available-for-sale securities accounted for as PCD assets		9
Securities sold during the period (realized)		6
Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis	1
Write-offs charged against the allowance		3
Additional increases to the allowance for credit losses on securities that had an allowance recorded in a previous period		1
Ending balance	3	1
Asset-backed
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	12	1
Available-for-sale securities accounted for as PCD assets
Securities sold during the period (realized)
Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis
Write-offs charged against the allowance
Additional increases to the allowance for credit losses on securities that had an allowance recorded in a previous period	5
Ending balance	$ 17	$ 1

Investments - Available-for-s_3

Investments - Available-for-sale Fixed Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Cost or Amortized Cost
Cost or Amortized Cost	$ 43,113	$ 42,615
Estimated Fair Value
Estimated Fair Value	40,840	40,626
Available-for-sale Fixed Maturities
Cost or Amortized Cost
Due in one year or less	1,238	1,121
Due after one year through five years	11,680	11,563
Due after five years through ten years	13,283	13,359
Due after ten years	16,677	16,371
Cost or Amortized Cost	42,878	42,414
Estimated Fair Value
Due in one year or less	1,207	1,091
Due after one year through five years	11,308	11,180
Due after five years through ten years	12,461	12,573
Due after ten years	15,629	15,581
Estimated Fair Value	$ 40,605	$ 40,425

Investments - Amortized Cost Ba

Investments - Amortized Cost Basis of Mortgage Loans for Each Credit Quality Indicator by Year of Origination (Details) - Commercial mortgage-backed $ in Millions	Mar. 31, 2024 USD ($)
Credit Quality Information [Abstract]
2024	$ 12
2023	126
2022	248
2021	76
2020	134
Prior	468
Total	1,064
DSCR Greater than or Equal to 1.6x, LTV Less than 55%
Credit Quality Information [Abstract]
2024
2023	33
2022	9
2021	2
2020	97
Prior	283
Total	424
DSCR Greater than or Equal to 1.6x, LTV 55% to 65%
Credit Quality Information [Abstract]
2024
2023
2022
2021	5
2020
Prior
Total	5
DSCR Greater than or Equal to 1.6x, LTV Greater than 65%
Credit Quality Information [Abstract]
2024
2023
2022	30
2021	12
2020
Prior
Total	42
DSCR Between 1.2 to 1.6x, LTV Less than 55%
Credit Quality Information [Abstract]
2024
2023	28
2022	5
2021
2020	13
Prior	63
Total	109
DSCR Between 1.2 to 1.6x, LTV 55% to 65%
Credit Quality Information [Abstract]
2024	12
2023	21
2022	36
2021	36
2020	24
Prior	31
Total	160
DSCR Between 1.2 to 1.6x, LTV Greater than 65%
Credit Quality Information [Abstract]
2024
2023	12
2022	65
2021
2020
Prior
Total	77
DSCR Less than or Equal to 1.2x, LTV Less than 55%
Credit Quality Information [Abstract]
2024
2023
2022
2021
2020
Prior
Total	0
DSCR Less than or Equal to 1.2x, LTV 55 to 65%
Credit Quality Information [Abstract]
2024
2023	32
2022	75
2021
2020
Prior	43
Total	150
DSCR Less than or Equal to 1.2x, LTV Greater than 65%
Credit Quality Information [Abstract]
2024
2023
2022	28
2021	21
2020
Prior	48
Total	$ 97

Investments - Aggregate Contrac

Investments - Aggregate Contractual or Notional Amounts and Estimated Fair Values Related to Derivative Financial Instruments (Details) - Without Hedge Designation - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Futures | Options – purchased
Gross Estimated Fair Values of Derivative Positions [Abstract]
Contractual/Notional Amount	$ 235	$ 202
Estimated Fair Value, Asset	1	1
Estimated Fair Value, Liability
Futures | Futures – short
Gross Estimated Fair Values of Derivative Positions [Abstract]
Contractual/Notional Amount	127	116
Estimated Fair Value, Asset
Estimated Fair Value, Liability
Warrants
Gross Estimated Fair Values of Derivative Positions [Abstract]
Contractual/Notional Amount	84	84
Estimated Fair Value, Asset	3	3
Estimated Fair Value, Liability
Interest rate swaps
Gross Estimated Fair Values of Derivative Positions [Abstract]
Contractual/Notional Amount	300	300
Estimated Fair Value, Asset	12	13
Estimated Fair Value, Liability
Currency forwards
Gross Estimated Fair Values of Derivative Positions [Abstract]
Contractual/Notional Amount		13
Estimated Fair Value, Asset
Estimated Fair Value, Liability		$ (1)

Investments - Investment Commit

Investments - Investment Commitments (Details) - Investments in Assets Requiring Future Purchase, Sale or Funding Commitments $ in Millions	Mar. 31, 2024 USD ($)
Other Commitments [Line Items]
Commitments to purchase or fund investments	$ 1,600
Commitments to sell investments	$ 25

Fair Value - Assets and Liabili

Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value, Recurring - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Assets and Liabilities Measured at Fair Value [Abstract]
Debt securities	$ 40,605	$ 40,425
Fixed maturities trading	235	201
Total fixed maturities	40,840	40,626
Equity securities	1,104	1,050
Short-term and other	5,222	4,247
Receivables	12	13
Payable to brokers	(38)	(62)
Corporate bonds and other
Assets and Liabilities Measured at Fair Value [Abstract]
Debt securities	25,237	25,132
States, municipalities and political subdivisions
Assets and Liabilities Measured at Fair Value [Abstract]
Debt securities	7,288	7,392
Asset-backed
Assets and Liabilities Measured at Fair Value [Abstract]
Debt securities	8,080	7,901
Level 1
Assets and Liabilities Measured at Fair Value [Abstract]
Debt securities	189	161
Fixed maturities trading	235	201
Total fixed maturities	424	362
Equity securities	654	586
Short-term and other	5,203	4,215
Receivables
Payable to brokers	(38)	(62)
Level 1 | Corporate bonds and other
Assets and Liabilities Measured at Fair Value [Abstract]
Debt securities	189	161
Level 1 | States, municipalities and political subdivisions
Assets and Liabilities Measured at Fair Value [Abstract]
Debt securities
Level 1 | Asset-backed
Assets and Liabilities Measured at Fair Value [Abstract]
Debt securities
Level 2
Assets and Liabilities Measured at Fair Value [Abstract]
Debt securities	38,420	38,274
Fixed maturities trading
Total fixed maturities	38,420	38,274
Equity securities	439	440
Short-term and other	19	32
Receivables	12	13
Payable to brokers
Level 2 | Corporate bonds and other
Assets and Liabilities Measured at Fair Value [Abstract]
Debt securities	23,966	23,926
Level 2 | States, municipalities and political subdivisions
Assets and Liabilities Measured at Fair Value [Abstract]
Debt securities	7,245	7,348
Level 2 | Asset-backed
Assets and Liabilities Measured at Fair Value [Abstract]
Debt securities	7,209	7,000
Level 3
Assets and Liabilities Measured at Fair Value [Abstract]
Debt securities	1,996	1,990
Fixed maturities trading
Total fixed maturities	1,996	1,990
Equity securities	11	24
Short-term and other
Receivables
Payable to brokers
Level 3 | Corporate bonds and other
Assets and Liabilities Measured at Fair Value [Abstract]
Debt securities	1,082	1,045
Level 3 | States, municipalities and political subdivisions
Assets and Liabilities Measured at Fair Value [Abstract]
Debt securities	43	44
Level 3 | Asset-backed
Assets and Liabilities Measured at Fair Value [Abstract]
Debt securities	$ 871	$ 901

Fair Value - Reconciliations of

Fair Value - Reconciliations of Assets and Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Corporate bonds and other
Reconciliations for All Assets and Liabilities [Roll Forward]
Balance at beginning of period	$ 1,045	$ 810
Included in Net Income
Included in OCI	(12)	24
Purchases	74	81
Sales
Settlements	(36)	(3)
Transfers into Level 3	11
Transfers out of Level 3
Balance at ending of period	1,082	912
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at March 31
Unrealized Gains (Losses) Recognized in Other Comprehensive Income (Loss) on Level 3 Assets and Liabilities Held at March 31	(14)	24
States, municipalities and political subdivisions
Reconciliations for All Assets and Liabilities [Roll Forward]
Balance at beginning of period	44	43
Included in Net Income
Included in OCI	(1)	1
Purchases
Sales
Settlements
Transfers into Level 3
Transfers out of Level 3
Balance at ending of period	43	44
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at March 31
Unrealized Gains (Losses) Recognized in Other Comprehensive Income (Loss) on Level 3 Assets and Liabilities Held at March 31	(1)	1
Asset-backed
Reconciliations for All Assets and Liabilities [Roll Forward]
Balance at beginning of period	901	788
Included in Net Income	2	5
Included in OCI	(5)	7
Purchases	18	55
Sales	(9)
Settlements	(17)	(9)
Transfers into Level 3		23
Transfers out of Level 3	(19)	(10)
Balance at ending of period	871	859
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at March 31
Unrealized Gains (Losses) Recognized in Other Comprehensive Income (Loss) on Level 3 Assets and Liabilities Held at March 31	(5)	7
Fixed maturities available-for-sale
Reconciliations for All Assets and Liabilities [Roll Forward]
Balance at beginning of period	1,990	1,641
Included in Net Income	2	5
Included in OCI	(18)	32
Purchases	92	136
Sales	(9)	0
Settlements	(53)	(12)
Transfers into Level 3	11	23
Transfers out of Level 3	(19)	(10)
Balance at ending of period	1,996	1,815
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at March 31	0	0
Unrealized Gains (Losses) Recognized in Other Comprehensive Income (Loss) on Level 3 Assets and Liabilities Held at March 31	(20)	32
Equity securities
Reconciliations for All Assets and Liabilities [Roll Forward]
Balance at beginning of period	24	35
Included in Net Income	6	(6)
Included in OCI
Purchases
Sales	(19)
Settlements
Transfers into Level 3
Transfers out of Level 3
Balance at ending of period	11	29
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at March 31	1	(6)
Unrealized Gains (Losses) Recognized in Other Comprehensive Income (Loss) on Level 3 Assets and Liabilities Held at March 31

Fair Value - Significant Unobse

Fair Value - Significant Unobservable Inputs (Details) $ in Millions	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Quantitative Information About the Significant Unobservable Inputs [Abstract]
Estimated Fair Value	$ 40,840	$ 40,626
Level 3 | Fixed maturity securities
Quantitative Information About the Significant Unobservable Inputs [Abstract]
Estimated Fair Value	$ 1,521	$ 1,495
Debt Securities, Available-for-sale, Valuation Technique [Extensible List]	Discounted cash flow	Discounted cash flow
Debt Securities, Available-for-sale, Measurement Input [Extensible List]	Credit spread	Credit spread
Level 3 | Fixed maturity securities | Credit spread | Discounted cash flow | Minimum
Quantitative Information About the Significant Unobservable Inputs [Abstract]
Measurement input (as a percent)	0.01	0.01
Level 3 | Fixed maturity securities | Credit spread | Discounted cash flow | Maximum
Quantitative Information About the Significant Unobservable Inputs [Abstract]
Measurement input (as a percent)	0.07	0.07
Level 3 | Fixed maturity securities | Credit spread | Discounted cash flow | Weighted Average
Quantitative Information About the Significant Unobservable Inputs [Abstract]
Measurement input (as a percent)	(0.02)	(0.02)

Fair Value - Financial Assets a

Fair Value - Financial Assets and Liabilities not Measured at Fair Value (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Carrying Amount
Assets:
Other invested assets, primarily mortgage loans	$ 1,029	$ 1,035
Liabilities:
Short-term debt	1,677	1,083
Long-term debt	8,422	7,915
Estimated Fair Value
Assets:
Other invested assets, primarily mortgage loans	987	997
Liabilities:
Short-term debt	1,664	1,066
Long-term debt	8,094	7,640
Estimated Fair Value | Level 1
Assets:
Other invested assets, primarily mortgage loans
Liabilities:
Short-term debt
Long-term debt
Estimated Fair Value | Level 2
Assets:
Other invested assets, primarily mortgage loans
Liabilities:
Short-term debt	1,145	546
Long-term debt	7,663	7,255
Estimated Fair Value | Level 3
Assets:
Other invested assets, primarily mortgage loans	987	997
Liabilities:
Short-term debt	519	520
Long-term debt	$ 431	$ 385

Claim and Claim Adjustment Ex_3

Claim and Claim Adjustment Expense Reserves - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Loss from catastrophes, net of reinsurance	$ 88	$ 52
Pretax (favorable) unfavorable development	(7)	13
Commercial auto | CNA Financial
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Pretax (favorable) unfavorable development	$ (7)	$ 13

Claim and Claim Adjustment Ex_4

Claim and Claim Adjustment Expense Reserves - Reconciliation of Claim and Claim Adjustment Expense Reserves (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Gross reserves, beginning of year	$ 23,304	$ 22,120
Ceded reserves, beginning of year	5,141	5,191
Net reserves, beginning of year	18,163	16,929
Net incurred claim and claim adjustment expenses:
Provision for insured events of current year	1,502	1,326
Increase (decrease) in provision for insured events of prior years	(6)	13
Amortization of discount	10	11
Total net incurred	1,506	1,350
Net payments attributable to:
Current year events	(113)	(72)
Prior year events	(1,168)	(1,042)
Total net payments	(1,281)	(1,114)
Foreign currency translation adjustment and other	(41)	35
Net reserves, end of period	18,347	17,200
Ceded reserves, end of period	5,241	5,209
Gross reserves, end of period	$ 23,588	$ 22,409

Claim and Claim Adjustment Ex_5

Claim and Claim Adjustment Expense Reserves - Net Prior Year Loss Reserve Development in Property and Casualty Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Net Prior Year Development [Abstract]
Total pretax (favorable) unfavorable development	$ (7)	$ 13
Medical professional liability
Net Prior Year Development [Abstract]
Total pretax (favorable) unfavorable development		9
Surety
Net Prior Year Development [Abstract]
Total pretax (favorable) unfavorable development	(18)
Warranty
Net Prior Year Development [Abstract]
Total pretax (favorable) unfavorable development	13	(9)
Workers’ compensation
Net Prior Year Development [Abstract]
Total pretax (favorable) unfavorable development	(2)	(2)
Other property and casualty operations
Net Prior Year Development [Abstract]
Total pretax (favorable) unfavorable development		$ 15

Claim and Claim Adjustment Ex_6

Claim and Claim Adjustment Expense Reserves - A&EP Reserves (Details) - A&EP Reserves - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2010	Dec. 31, 2023
A&EP Reserves [Abstract]
Net A&EP claim and allocated claim adjustment expense reserves			$ 1,600
Aggregate limit under A&EP loss portfolio transfer			4,000
Ceded A&EP claim and allocated claim adjustment expense reserves under existing third party reinsurance contracts transferred to NICO under A&EP loss portfolio transfer			1,200
Reinsurance premium paid to NICO under A&EP loss portfolio transfer			2,000
Net reinsurance receivables transferred to NICO under A&EP loss portfolio transfer			215
Total consideration			$ 2,200
Retroactive reinsurance benefit recognized	$ 12	$ 8
Cumulative amounts ceded under loss portfolio transfer	3,600			$ 3,600
Unrecognized deferred retroactive reinsurance benefit	405			$ 417
Fair value of collateral trust account	$ 2,600

Future Policy Benefits Reserv_3

Future Policy Benefits Reserves - Balances and Changes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Present value of future net premiums
Balance, January 1			$ 3,710	$ 3,993
Effect of changes in discount rate	$ 56	$ 154	(125)	(74)
Balance, January 1, at original locked in discount rate			3,585	3,919
Effect of changes in cash flow assumptions
Expect of actual variances from expected experience			(28)	(49)
Adjusted balance, January 1	3,497	3,811	3,557	3,870
Interest accrual	47	52
Net premiums: earned during period	(107)	(111)
Balance, end of period at original locked in discount rate	3,497	3,811
Effect of changes in discount rate	56	154	(125)	(74)
Balance, March 31	3,553	3,965
Present value of future benefits & expenses
Balance, January 1			17,669	17,472
Effect of changes in discount rate	78	704	(578)	(125)
Balance, January 1, at original locked in discount rate	17,091	17,347
Effect of changes in cash flow assumptions
Effect of actual variances from expected experience			(13)	(50)
Adjusted balance, January 1			17,078	17,297
Interest accrual	231	242
Benefit & expense payments	(321)	(302)
Balance, end of period at original locked in discount rate	16,988	17,237
Effect of changes in discount rate	78	704	(578)	$ (125)
Balance, March 31	17,066	17,941
Net LFPB	13,513	13,976	$ 13,959
Re-measurement loss of insurance claims and policyholders’ benefits	$ (15)	$ 1

Future Policy Benefits Reserv_4

Future Policy Benefits Reserves - Earned Premiums and Interest Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Insurance [Abstract]
Earned premiums	$ 110	$ 115
Interest expense	$ 184	$ 190

Future Policy Benefits Reserv_5

Future Policy Benefits Reserves - Undiscounted Expected Future Benefit and Expense Payments and Undiscounted Expected Future Gross Premiums (Details) - USD ($) $ in Millions	Mar. 31, 2024	Mar. 31, 2023
Insurance [Abstract]
Expected future benefit and expense payments	$ 32,474	$ 33,759
Expected future gross premiums	$ 5,270	$ 5,729

Future Policy Benefits Reserv_6

Future Policy Benefits Reserves - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Insurance [Abstract]
Liability for future policy benefit, expected future gross premium, discounted, before reinsurance	$ 3,700	$ 4,000
Liability for future policy benefit, weighted-average duration (in years)	11 years	12 years
Liability for future policy benefit, adverse development, expense	$ 20	$ 13
Liability future policy benefit, losses recognized in prior period	$ 2	$ 11

Future Policy Benefits Reserv_7

Future Policy Benefits Reserves - Weighted Average Interest Rates (Details)	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Insurance [Abstract]
Original locked in discount rate	5.22%	5.22%	5.26%
Upper-medium grade fixed income instrument discount rate	5.20%	4.94%	4.92%

Shareholders' Equity - Componen

Shareholders' Equity - Components of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	$ 16,525	$ 15,201
Other comprehensive income (loss) before reclassifications, after tax	70	262
Reclassification of losses from accumulated other comprehensive loss, after tax	31	27
Other comprehensive income (loss)	101	289
Amounts attributable to noncontrolling interests	(8)	(31)
Other	3
Balance at end of period	16,998	15,314
Cumulative Effect, Period of Adoption, Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period		(277)
As Reported
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period		15,478
Net Unrealized Gains (Losses) on Investments with an Allowance for Credit Losses
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(12)	(7)
Other comprehensive income (loss) before reclassifications, after tax	(1)	(8)
Reclassification of losses from accumulated other comprehensive loss, after tax	3
Other comprehensive income (loss)	2	(8)
Amounts attributable to noncontrolling interests		1
Other	1
Balance at end of period	(9)	(14)
Other comprehensive income (loss) before reclassifications, tax	0	2
Reclassification of losses from accumulated other comprehensive loss, tax	(1)	0
Net Unrealized Gains (Losses) on Investments with an Allowance for Credit Losses | Cumulative Effect, Period of Adoption, Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period
Cumulative effect adjustments from changes in accounting standards, tax			$ 0
Net Unrealized Gains (Losses) on Investments with an Allowance for Credit Losses | As Reported
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period		(7)
Net Unrealized Gains (Losses) on Other Investments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(1,483)	(2,469)
Other comprehensive income (loss) before reclassifications, after tax	(239)	652
Reclassification of losses from accumulated other comprehensive loss, after tax	22	18
Other comprehensive income (loss)	(217)	670
Amounts attributable to noncontrolling interests	19	(68)
Other	5
Balance at end of period	(1,676)	(1,867)
Other comprehensive income (loss) before reclassifications, tax	64	(176)
Reclassification of losses from accumulated other comprehensive loss, tax	(6)	(4)
Net Unrealized Gains (Losses) on Other Investments | Cumulative Effect, Period of Adoption, Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period
Cumulative effect adjustments from changes in accounting standards, tax			0
Net Unrealized Gains (Losses) on Other Investments | As Reported
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period		(2,469)
Cumulative impact of changes in discount rates used to measure long duration contracts
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(329)	(36)
Other comprehensive income (loss) before reclassifications, after tax	341	(396)
Reclassification of losses from accumulated other comprehensive loss, after tax
Other comprehensive income (loss)	341	(396)
Amounts attributable to noncontrolling interests	(29)	39
Other
Balance at end of period	(17)	(393)
Other comprehensive income (loss) before reclassifications, tax	(91)	105
Reclassification of losses from accumulated other comprehensive loss, tax	0	0
Cumulative impact of changes in discount rates used to measure long duration contracts | Cumulative Effect, Period of Adoption, Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period		(36)
Cumulative effect adjustments from changes in accounting standards, tax			11
Cumulative impact of changes in discount rates used to measure long duration contracts | As Reported
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period		0
Unrealized Gains (Losses) on Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	9	14
Other comprehensive income (loss) before reclassifications, after tax	2	(2)
Reclassification of losses from accumulated other comprehensive loss, after tax
Other comprehensive income (loss)	2	(2)
Amounts attributable to noncontrolling interests
Other	(1)
Balance at end of period	10	12
Other comprehensive income (loss) before reclassifications, tax	(1)	1
Reclassification of losses from accumulated other comprehensive loss, tax	0	0
Unrealized Gains (Losses) on Cash Flow Hedges | Cumulative Effect, Period of Adoption, Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period
Cumulative effect adjustments from changes in accounting standards, tax			0
Unrealized Gains (Losses) on Cash Flow Hedges | As Reported
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period		14
Pension and Postretirement Benefits
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(533)	(622)
Other comprehensive income (loss) before reclassifications, after tax
Reclassification of losses from accumulated other comprehensive loss, after tax	6	9
Other comprehensive income (loss)	6	9
Amounts attributable to noncontrolling interests	(1)	(1)
Other	(2)
Balance at end of period	(530)	(614)
Other comprehensive income (loss) before reclassifications, tax	0	0
Reclassification of losses from accumulated other comprehensive loss, tax	(1)	(2)
Pension and Postretirement Benefits | Cumulative Effect, Period of Adoption, Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period
Cumulative effect adjustments from changes in accounting standards, tax			0
Pension and Postretirement Benefits | As Reported
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period		(622)
Foreign Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(149)	(200)
Other comprehensive income (loss) before reclassifications, after tax	(33)	16
Reclassification of losses from accumulated other comprehensive loss, after tax
Other comprehensive income (loss)	(33)	16
Amounts attributable to noncontrolling interests	3	(2)
Other
Balance at end of period	(179)	(186)
Other comprehensive income (loss) before reclassifications, tax	0	0
Reclassification of losses from accumulated other comprehensive loss, tax	0	0
Foreign Currency Translation | Cumulative Effect, Period of Adoption, Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period
Cumulative effect adjustments from changes in accounting standards, tax			$ 0
Foreign Currency Translation | As Reported
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period		(200)
Total Accumulated Other Comprehensive Income (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(2,497)	(3,320)
Balance at end of period	$ (2,401)	(3,062)
Total Accumulated Other Comprehensive Income (Loss) | Cumulative Effect, Period of Adoption, Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period		(36)
Total Accumulated Other Comprehensive Income (Loss) | As Reported
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period		$ (3,284)

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Equity, Class of Treasury Stock [Line Items]
Purchases of treasury stock (in shares)	0.2	8.2
Purchases of treasury stock	$ 17	$ 486

Debt (Details)

Debt (Details) - Senior Notes $ in Millions	Feb. 29, 2024 USD ($)
CNA Financial | 5.1% Senior Notes Due February 15, 2034
Debt [Abstract]
Face amount	$ 500
Interest rate (as a percent)	5.10%
CNA Financial | 4.0% Senior Notes Due May, 2024
Debt [Abstract]
Interest rate (as a percent)	4%
Long term debt	$ 550
Transportation and storage of natural gas and NGLs and ethane supply and transportation services – Boardwalk Pipelines | 5.6% Senior Notes Due August 1, 2034
Debt [Abstract]
Face amount	$ 600
Interest rate (as a percent)	5.60%
Transportation and storage of natural gas and NGLs and ethane supply and transportation services – Boardwalk Pipelines | 5.0% Notes Due December 2024
Debt [Abstract]
Interest rate (as a percent)	5%
Long term debt	$ 600

Revenue from Contracts with C_3

Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenues [Abstract]
Revenues from contracts with customers	$ 710	$ 571
Other revenues	26	23
Operating revenues and other	736	594
CNA Financial | Non-insurance warranty
Disaggregation of Revenues [Abstract]
Revenues from contracts with customers	407	407
Boardwalk Pipelines | Transportation and storage of natural gas and NGLs and other services
Disaggregation of Revenues [Abstract]
Revenues from contracts with customers	501	386
Loews Hotels & Co | Lodging and related services
Disaggregation of Revenues [Abstract]
Revenues from contracts with customers	$ 209	$ 185

Revenue from Contracts with C_4

Revenue from Contracts with Customers - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Revenue recognized	$ 410	$ 397
Receivables
Disaggregation of Revenue [Line Items]
Receivables from contracts with customers	201		$ 228
Other Liabilities
Disaggregation of Revenue [Line Items]
Deferred revenue	$ 4,700		$ 4,800

Revenue from Contracts with C_5

Revenue from Contracts with Customers - Performance Obligations (Details) $ in Billions	Mar. 31, 2024 USD ($)
Disaggregation of Revenue [Line Items]
Remaining performance obligations	$ 15.1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01
Disaggregation of Revenue [Line Items]
Remaining performance obligations	$ 2.2
Expected timing of satisfaction	9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Disaggregation of Revenue [Line Items]
Remaining performance obligations	$ 2.5
Expected timing of satisfaction	1 year

Benefit Plans - Components of N

Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pension Benefits
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 1	$ 1
Interest cost	24	28
Expected return on plan assets	(29)	(32)
Amortization of unrecognized net loss	7	9
Net periodic cost	3	6
Other Postretirement Benefits
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost
Interest cost	1	1
Expected return on plan assets	(1)	(1)
Amortization of unrecognized net loss
Net periodic cost	$ 0	$ 0

Legal Proceedings (Details)

Legal Proceedings (Details) $ in Millions	Nov. 12, 2021 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Trial court, plaintiff award	$ 690
Trial court, plaintiff award, plus pre-judgement interest	$ 166

Commitments and Contingencies (

Commitments and Contingencies (Details) $ in Billions	Mar. 31, 2024 USD ($)
CNA Financial
Commitments and Contingencies [Abstract]
Potential amount of future payments under guarantees	$ 1.5

Segments (Details)

Segments (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($) Segment subsidiary	Mar. 31, 2023 USD ($)
Segments [Abstract]
Number of reportable segments | Segment	4
Number of individual operating subsidiaries | subsidiary	3
Revenues:
Insurance premiums	$ 2,441	$ 2,248
Net investment income	669	569
Investment losses	(22)	(35)
Non-insurance warranty revenue	407	407
Operating revenues and other	736	594
Total	4,231	3,783
Expenses:
Insurance claims and policyholders’ benefits	1,807	1,653
Amortization of deferred acquisition costs	444	379
Non-insurance warranty expense	394	384
Operating expenses and other	880	781
Equity method (income) loss	(26)	(28)
Interest	103	95
Total	3,602	3,264
Income before income tax	629	519
Income tax expense	(144)	(115)
Net income	485	404
Amounts attributable to noncontrolling interests	(28)	(29)
Net income attributable to Loews Corporation	457	375
Operating Segments | CNA Financial
Revenues:
Insurance premiums	2,441	2,248
Net investment income	609	525
Investment losses	(22)	(35)
Non-insurance warranty revenue	407	407
Operating revenues and other	9	7
Total	3,444	3,152
Expenses:
Insurance claims and policyholders’ benefits	1,807	1,653
Amortization of deferred acquisition costs	444	379
Non-insurance warranty expense	394	384
Operating expenses and other	337	337
Equity method (income) loss
Interest	35	28
Total	3,017	2,781
Income before income tax	427	371
Income tax expense	(89)	(74)
Net income	338	297
Amounts attributable to noncontrolling interests	(28)	(29)
Net income attributable to Loews Corporation	310	268
Operating Segments | Boardwalk Pipelines
Revenues:
Insurance premiums
Net investment income	4	1
Investment losses
Non-insurance warranty revenue
Operating revenues and other	513	396
Total	517	397
Expenses:
Insurance claims and policyholders’ benefits
Amortization of deferred acquisition costs
Non-insurance warranty expense
Operating expenses and other	312	242
Equity method (income) loss
Interest	43	39
Total	355	281
Income before income tax	162	116
Income tax expense	(41)	(30)
Net income	121	86
Amounts attributable to noncontrolling interests
Net income attributable to Loews Corporation	121	86
Operating Segments | Loews Hotels & Co
Revenues:
Insurance premiums
Net investment income	2	1
Investment losses
Non-insurance warranty revenue
Operating revenues and other	214	191
Total	216	192
Expenses:
Insurance claims and policyholders’ benefits
Amortization of deferred acquisition costs
Non-insurance warranty expense
Operating expenses and other	209	183
Equity method (income) loss	(27)	(31)
Interest	6	6
Total	188	158
Income before income tax	28	34
Income tax expense	(12)	(10)
Net income	16	24
Amounts attributable to noncontrolling interests
Net income attributable to Loews Corporation	16	24
Segment Reconciling Items | Corporate
Revenues:
Insurance premiums
Net investment income	54	42
Investment losses
Non-insurance warranty revenue
Operating revenues and other
Total	54	42
Expenses:
Insurance claims and policyholders’ benefits
Amortization of deferred acquisition costs
Non-insurance warranty expense
Operating expenses and other	22	19
Equity method (income) loss	1	3
Interest	19	22
Total	42	44
Income before income tax	12	(2)
Income tax expense	(2)	(1)
Net income	10	(3)
Amounts attributable to noncontrolling interests
Net income attributable to Loews Corporation	$ 10	$ (3)