Loews (L) 10-K 11 Feb 25 2024 FY Annual report Financial data

Cover

Cover - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Feb. 07, 2025	Jun. 30, 2024
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2024
Current Fiscal Year End Date	--12-31
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 Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
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
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction	false
Entity Shell Company	false
Entity Public Float			$ 13,336
Entity Common Stock, Shares Outstanding		212,861,300
Documents Incorporated by Reference	Portions of the registrant’s definitive proxy statement for the 2025 annual meeting of shareholders, intended to be filed by the registrant with the Commission not later than 120 days after the close of its fiscal year, are incorporated by reference into Part III of this Report.
Entity Central Index Key	0000060086
Amendment Flag	false
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	FY

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2024
Audit Information [Abstract]
Auditor Name	DELOITTE & TOUCHE LLP
Auditor Location	New York, New York
Auditor Firm ID	34

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Investments:
Fixed maturities, amortized cost of $44,196 and $42,615, less allowance for credit loss of $45 and $16	$ 41,827	$ 40,626
Equity securities, cost of $969 and $1,015	1,064	1,050
Limited partnership investments	2,520	2,174
Other invested assets, primarily mortgage loans, less allowance for credit loss of $35 and $35	1,113	1,123
Short-term investments	4,606	4,396
Total investments	51,130	49,369
Cash	541	399
Receivables	10,522	9,660
Property, plant and equipment	10,738	10,718
Goodwill	347	347
Deferred non-insurance warranty acquisition expenses	3,525	3,661
Deferred acquisition costs of insurance subsidiaries	959	896
Other assets	4,181	4,147
Total assets	81,943	79,197
Insurance reserves:
Claim and claim adjustment expense	24,976	23,304
Future policy benefits	13,158	13,959
Unearned premiums	7,346	6,933
Total insurance reserves	45,480	44,196
Payable to brokers	110	79
Short-term debt	5	1,084
Long-term debt	8,939	7,919
Deferred income taxes	550	398
Deferred non-insurance warranty revenue	4,530	4,694
Other liabilities	4,392	4,302
Total liabilities	64,006	62,672
Commitments and contingent liabilities
Shareholders’ equity:
Preferred stock
Common stock	2	2
Additional paid-in capital	2,490	2,589
Retained earnings	16,459	15,617
Accumulated other comprehensive loss	(1,867)	(2,497)
Shareholders' equity before treasury stock, total	17,084	15,711
Less treasury stock, at cost (212,251 and 100,000 shares)	(18)	(7)
Total shareholders’ equity	17,066	15,704
Noncontrolling interests	871	821
Total equity	17,937	16,525
Total liabilities and equity	$ 81,943	$ 79,197

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Investments:
Fixed maturities, amortized cost	$ 44,196	$ 42,615
Fixed maturities, allowance for credit loss	45	16
Equity securities, cost	969	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)	214,912,595	222,268,150
Treasury stock, shares (in shares)	212,251	100,000

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues:
Insurance premiums	$ 10,211	$ 9,480	$ 8,667
Net investment income	2,780	2,395	1,802
Investment losses	(81)	(53)	(199)
Non-insurance warranty revenue	1,609	1,624	1,574
Operating revenues and other	2,991	2,455	2,200
Total	17,510	15,901	14,044
Expenses:
Insurance claims and policyholders’ benefits (re-measurement loss of $(125), $(88), and $(214))	7,738	7,068	6,653
Amortization of deferred acquisition costs	1,798	1,644	1,490
Non-insurance warranty expense	1,547	1,544	1,471
Operating expenses and other	4,170	3,393	3,077
Equity method income	(58)	(120)	(139)
Interest	441	376	378
Total	15,636	13,905	12,930
Income (loss) before income tax	1,874	1,996	1,114
Income tax expense	(380)	(451)	(223)
Net income (loss)	1,494	1,545	891
Amounts attributable to noncontrolling interests	(80)	(111)	(69)
Net income (loss) attributable to Loews Corporation	$ 1,414	$ 1,434	$ 822
Basic net income per share (in dollars per share)	$ 6.42	$ 6.30	$ 3.39
Diluted net income per share (in dollars per share)	$ 6.41	$ 6.29	$ 3.38
Basic weighted average number of shares outstanding (in shares)	220,260	227,480	242,830
Diluted weighted average number of shares outstanding (in shares)	220,530	227,810	243,280

CONSOLIDATED STATEMENTS OF OP_2

CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Statement [Abstract]
Re-measurement loss of insurance claims and policyholders’ benefits	$ (125)	$ (88)	$ (214)

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 1,494	$ 1,545	$ 891
Other comprehensive income (loss), after tax
Net unrealized losses on investments with an allowance for credit losses	(1)	(5)	(5)
Net unrealized gains (losses) on other investments	(262)	1,125	(6,097)
Total unrealized gains (losses) on investments	(263)	1,120	(6,102)
Impact of changes in discount rates used to measure long-duration contract liabilities	712	(318)	3,959
Unrealized gains (losses) on cash flow hedges		(5)	20
Pension and postretirement benefits	340	104	15
Foreign currency translation	(102)	60	(111)
Other comprehensive income (loss)	687	961	(2,219)
Comprehensive income (loss)	2,181	2,506	(1,328)
Amounts attributable to noncontrolling interests	(137)	(188)	150
Total comprehensive income (loss) attributable to Loews Corporation	$ 2,044	$ 2,318	$ (1,178)

CONSOLIDATED STATEMENTS OF EQUI

CONSOLIDATED STATEMENTS OF EQUITY - 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, 2021	$ 17,471	$ (1,704)	$ 19,175	$ 2	$ 2	$ 2,885	$ 2,885	$ 14,754	$ (22)	$ 14,776	$ (1,320)	$ (1,506)	$ 186	$ (3)	$ (3)	$ 1,153	$ (176)	$ 1,329
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	891							822								69
Other comprehensive income (loss)	(2,219)										(2,000)					(219)
Dividends paid	(159)							(61)								(98)
Purchase of subsidiary stock from noncontrolling interests	(66)					4										(70)
Purchases of Loews Corporation treasury stock	(738)													(738)
Retirement of treasury stock	0					(146)		(583)						729
Stock-based compensation	21					3										18
Other	0					2		(1)								(1)
Balance at end of period at Dec. 31, 2022	15,201			2		2,748		14,931			(3,320)			(12)		852
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,545							1,434								111
Other comprehensive income (loss)	961										884					77
Dividends paid	(131)							(57)								(74)
Purchase of subsidiary stock from noncontrolling interests	(202)					27					(61)					(168)
Purchases of Loews Corporation treasury stock	(852)													(852)
Retirement of treasury stock	0					(164)		(693)						857
Stock-based compensation	26					3										23
Other	(23)					(25)		2
Balance at end 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	1,494							1,414								80
Other comprehensive income (loss)	687										630					57
Dividends paid	(140)							(55)								(85)
Purchase of subsidiary stock from noncontrolling interests	(20)															(20)
Purchases of Loews Corporation treasury stock	(617)													(617)
Retirement of treasury stock	0					(89)		(517)						606
Stock-based compensation	19					(1)										20
Other	(11)					(9)										(2)
Balance at end of period at Dec. 31, 2024	$ 17,937			$ 2		$ 2,490		$ 16,459			$ (1,867)			$ (18)		$ 871

CONSOLIDATED STATEMENTS OF EQ_2

CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Stockholders' Equity [Abstract]
Dividends paid (in dollars per share)	$ 0.25	$ 0.25	$ 0.25

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Activities:
Net income	$ 1,494	$ 1,545	$ 891
Adjustments to reconcile net income to net cash provided by operating activities:
Investment losses	81	53	199
Equity method investees	(66)	18	236
Amortization of investments	(200)	(191)	(129)
Depreciation and amortization	583	538	509
Provision for deferred income taxes	(45)	127	(50)
Other non-cash items	98	109	90
Changes in operating assets and liabilities, net:
Receivables	(929)	(268)	(316)
Deferred acquisition costs	(69)	(85)	(79)
Insurance reserves	2,365	1,667	2,058
Other assets	417	(88)	(391)
Other liabilities	(9)	(95)	137
Trading securities	(695)	577	159
Net cash flow provided by operating activities	3,025	3,907	3,314
Investing Activities:
Purchases of fixed maturities	(6,353)	(6,616)	(9,821)
Proceeds from sales of fixed maturities	2,793	4,029	5,909
Proceeds from maturities of fixed maturities	2,396	1,334	2,358
Purchases of equity securities	(444)	(293)	(294)
Proceeds from sales of equity securities	523	317	509
Purchases of limited partnership investments	(335)	(402)	(337)
Proceeds from sales of limited partnership investments	98	231	171
Purchases of property, plant and equipment	(632)	(686)	(660)
Acquisitions		(401)
Dispositions	23		16
Change in short-term investments	(30)	(80)	(27)
Other, net	(14)	(178)	(171)
Net cash flow used by investing activities	(1,975)	(2,745)	(2,347)
Financing Activities:
Dividends paid	(55)	(57)	(61)
Dividends paid to noncontrolling interests	(85)	(74)	(98)
Purchases of Loews Corporation treasury stock	(608)	(849)	(729)
Purchases of subsidiary stock from noncontrolling interests	(20)	(202)	(66)
Principal payments on debt	(1,366)	(878)	(640)
Payment of debt	1,294	778	573
Other, net	(58)	(18)	(16)
Net cash flow used by financing activities	(898)	(1,300)	(1,037)
Effect of foreign exchange rate on cash	(10)	5	(19)
Net change in cash	142	(133)	(89)
Cash, beginning of year	399	532	621
Cash, end of year	$ 541	$ 399	$ 532

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2024
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies 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, olefins 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 subsidiaries, the term “Parent Company” means Loews Corporation excluding its subsidiaries and the term “Net income (loss) attributable to Loews Corporation” means Net income (loss) attributable to Loews Corporation shareholders. Accounting estimates and principles of consolidation – The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (“GAAP”) requires management to make estimates and assumptions that affect the amounts reported on the consolidated financial statements and the related notes. Actual results could differ from those estimates. The Consolidated Financial Statements include all subsidiaries and intercompany accounts and transactions have been eliminated. Investments – Fixed maturity securities are classified as either available-for-sale or trading, and as such, they are carried at fair value. Short-term investments are carried at fair value. Changes in fair value of trading securities are reported within Net investment income on the Consolidated Statements of Operations. Changes in fair value of available-for-sale securities are reported as a component of Other comprehensive income. The cost of fixed maturity securities classified as available-for-sale is adjusted for amortization of premiums and accretion of discounts, which are included in Net investment income on the Consolidated Statements of Operations. The amortization of premium and accretion of discount for fixed maturity securities takes into consideration call and maturity dates that produce the lowest yield. For asset-backed securities included in fixed maturity securities, income is recognized using an effective yield based on anticipated prepayments and the estimated economic life of the securities. When estimates of prepayments change, the effective yield is recalculated to reflect actual payments to date and anticipated future payments predominantly using the retrospective method. Equity securities are carried at fair value. Non-redeemable preferred stock investments contain characteristics of debt securities, are priced similarly to bonds and are held primarily for income generation through periodic dividends. While recognition of gains and losses on these securities is not discretionary, the changes in fair value of non-redeemable preferred stock are not considered to be reflective of its primary operations. As such, the changes in the fair value of these securities are recorded through Investment gains (losses) on the Consolidated Statements of Operations. Common stock is owned with the intention of holding the securities primarily for market appreciation and as such, the changes in the fair value of these securities are recorded through Net investment income (loss). Carrying value of investments in limited partnerships is the owner’s share of the net asset value of each partnership, as determined by the general partner. Certain partnerships for which results are not available on a timely basis are reported on a lag, primarily three months or less. These investments are accounted for under the equity method and changes in net asset values are recorded within Net investment income on the Consolidated Statements of Operations. Mortgage loans are commercial in nature, are carried at unpaid principal balance, net of unamortized fees and an allowance for expected credit losses, and are recorded once funded. The allowance for expected credit losses on mortgage loans is developed by assessing the credit quality of pools of mortgage loans in good standing using debt service coverage ratios (“DSCR”) and loan-to-value (“LTV”) ratios. The DSCR compares a property’s net operating income to its debt service payments, including principal and interest. The LTV ratio compares the current unpaid principal balance of the loan to the estimated fair value of the underlying property collateralizing the loan. The pools developed to measure the credit loss allowance use increments of DSCR and LTV to draw distinctions between risk levels. Expected credit loss rates are applied by pool to the outstanding receivable balances. Changes in the allowance for mortgage loans are presented as a component of Investment gains (losses) on the Consolidated Statements of Operations. Mortgage loans are included in Other invested assets on the Consolidated Balance Sheets. Interest income from mortgage loans is recognized on an accrual basis using the effective yield method. Investments in derivative securities are carried at fair value with changes in fair value reported as a component of Investment gains (losses), Net investment income or Other comprehensive income (loss), depending on their hedge designation. A derivative is typically defined as an instrument whose value is “derived” from an underlying instrument, index or rate, has a notional amount, requires little or no initial investment and can be net settled. Derivatives include the following types of investments: interest rate swaps, interest rate caps and floors, put and call options, warrants, futures, forwards, commitments to purchase securities, credit default swaps and combinations of the foregoing. Derivatives embedded within non-derivative instruments (such as call options embedded in convertible bonds) must be split from the host instrument when the embedded derivative is not clearly and closely related to the host instrument. An available-for-sale security is impaired if the fair value of the security is less than its cost adjusted for accretion, amortization and allowance for credit losses. When a security is impaired, it is evaluated to determine whether there is an intent to sell the security before recovery of amortized cost or whether a credit loss exists. Losses on securities that are intended to be sold are recognized as impairment losses within Investment gains (losses) on the Consolidated Statements of Operations. If a credit loss exists, an allowance is established and the corresponding amount is recognized as an impairment loss within Investment gains (losses) on the Consolidated Statements of Operations. The allowance for credit losses related to available-for-sale fixed maturity securities is the difference between the present value of cash flows expected to be collected and the amortized cost basis. In subsequent periods, the allowance is reviewed, with any changes in the allowance presented as a component of Investment gains (losses) on the Consolidated Statements of Operations. Changes in the difference between the amortized cost basis, net of the allowance, and the fair value, are recognized in Other comprehensi ve income. Significant judgment is required in the determination of whether an impairment loss has occurred for a security. A consistent and systematic process is followed for determining and recording an impairment loss, including the evaluation of securities in an unrealized loss position and securities with an allowance for credit losses on at least a quarterly basis. The assessment of whether an impairment loss has occurred incorporates both quantitative and qualitative information. A credit loss exists if the present value of cash flows expected to be collected is less than the amortized cost basis. Significant assumptions enter into these cash flow projections including delinquency rates, probable risk of default, loss severity upon a default, over collateralization and interest coverage triggers and credit support from lower level tranches. All available evidence is considered when determining whether an investment requires a credit loss write-down or allowance to be recorded. Examples of such evidence may include the financial condition and near-term and long-term prospects of the issuer, whether the issuer is current with interest and principal payments, credit ratings on the security or changes in ratings over time, general market conditions and industry, sector or other specific factors and whether it is likely that the amortized cost will be recovered through the collection of cash flows. Credit losses – The allowances for credit losses on fixed maturity securities, mortgage loans, reinsurance receivables, insurance receivables and trade receivables are valuation accounts that are reported as a reduction of a financial asset’s cost basis and are measured on a pool basis when similar risk characteristics exist. The allowance is estimated using relevant available information from both internal and external sources. Historical credit loss experience provides the basis for the estimation of expected credit losses and adjustments may be made to reflect current conditions and reasonable and supportable forecasts. Adjustments to historical loss information are made for additional factors that come to the Company’s attention. This could include significant shifts in counterparty financial strength ratings, aging of past due receivables, amounts sent to collection agencies, or other underlying portfolio changes. Current and forecast economic conditions are considered, using a variety of economic metrics and forecast indices. The sensitivity of expected credit losses relative to changes to the forecast of economic conditions can vary by financial asset class. A reasonable and supportable forecast period is up to 24 months from the balance sheet date. After the forecast period, the Company reverts to historical credit experience. Collateral arrangements such as letters of credit and amounts held in beneficiary trusts to mitigate credit risk are considered in the estimate of the net amount expected to be collected. Amounts are written off against the allowance when determined to be uncollectible. A policy election has been made to present accrued interest balances separately from the amortized cost basis of assets, and a practical expedient has been elected to exclude the accrued interest from the tabular disclosures for mortgage loans and available-for-sale securities. An election has been made not to estimate an allowance for credit losses on accrued interest receivables. The accrual of interest income is discontinued and the asset is placed on nonaccrual status within 90 days of the interest becoming delinquent. Interest accrued but not received for assets on nonaccrual status is reversed through Net investment income. Interest received for assets that are on nonaccrual status is recognized as payment is received. The asset is returned to accrual status when the principal and interest amounts contractually due are brought current, and future payments are expected. Interest receivables are presented in Receivables on the Consolidated Balance Sheet. Equity method investments – Loews Hotels & Co has interests in operating joint ventures related to hotel properties over which it exercises significant influence but does not have control over them. Loews Hotels & Co uses the equity method of accounting for these investments. The Company also has interests in Altium Packaging LLC (“Altium Packaging”), which is engaged in the manufacture of rigid packaging solutions. Loews Corporation shares certain participating rights related to capital allocation and other decisions with the joint venture partner, therefore, the investment in Altium Packaging is accounted for under the equity method of accounting. The Company’s total investment in entities accounted for under the equity method of accounting, excluding limited partnership investments, was $937 million and $996 million as of December 31, 2024 and 2023 and is reported in Other assets on the Consolidated Balance Sheets. Equity method income for investments accounted for under the equity method of accounting, excluding limited partnerships, was $58 million, $120 million and $139 million for the years ended December 31, 2024, 2023 and 2022 and is reported separately in expenses on the Consolidated Statements of Operations. Equity method investments are reviewed for impairment when changes in circumstances indicate that the carrying value of the asset may not be recoverable. See Note 3 for a discussion of limited partnership investments. Hedging – The Company formally documents all relationships between hedging instruments and hedged items, as well as its risk-management objective and strategy for undertaking various hedging transactions. The Company also formally assesses (both at the hedge’s inception and on an ongoing basis) whether the derivatives that are used in hedging transactions have been highly effective in offsetting changes in fair value or cash flows of hedged items and whether those derivatives may be expected to remain highly effective in future periods. When it is determined that a derivative for which hedge accounting has been designated is not (or ceases to be) highly effective, the Company discontinues hedge accounting prospectively. See Note 3 for additional information on the Company’s use of derivatives. Securities lending activities – The Company lends securities for the purpose of enhancing income or to finance positions to unrelated parties who have been designated as primary dealers by the Federal Reserve Bank of New York. Borrowers of these securities must deposit and maintain collateral with the Company of no less than 100% of the fair value of the securities loaned. United States of America (“U.S.”) Government securities and cash are accepted as collateral. The Company maintains effective control over loaned securities and, therefore, continues to report such securities as investments on the Consolidated Balance Sheets. Securities lending is typically done on a matched-book basis where the collateral is invested to substantially match the term of the loan. This matching of terms tends to limit risk. In accordance with the Company’s lending agreements, securities on loan are returned immediately to the Company upon notice. Collateral is not reflected as an asset of the Company. There was no collateral held at December 31, 2024 and 2023. Revenue recognition – Premiums on property and casualty insurance contracts are recognized in proportion to the underlying risk insured and are primarily earned ratably over the term of the policies. Premiums on long-term care contracts are earned ratably over the policy year in which they are due. The reserve for unearned premiums represents the portion of premiums written relating to the unexpired terms of coverage. Property and casualty contracts that are retrospectively rated or subject to audit premiums contain provisions that result in an adjustment to the initial policy premium depending on the contract provisions. These provisions stipulate the adjustment due to loss experience of the insured during the coverage period, or changes in the level of exposure to insurance risk. For such contracts, CNA estimates the amount of ultimate premiums that it may earn upon completion of the coverage period and recognizes either an asset or a liability for the difference between the initial policy premium and the estimated ultimate premium. CNA either adjusts such estimated ultimate premium amounts during the course of the coverage period based on actual results to date or by conducting premium audits after the policy has expired to determine the final exposure to insured risks. The resulting adjustment is recorded as either a reduction of or an increase to the earned premiums for the period. Insurance receivables include balances due currently or in the future, including amounts due from insureds related to paid losses under high deductible policies, and are presented at unpaid balances, net of an allowance for doubtful accounts. As of December 31, 2024 and 2023, an allowance for doubtful accounts of $26 million and $28 million for insurance receivables has been established using a loss rate methodology to determine expected credit losses for premium receivables. This methodology uses CNA’s historical annual credit losses relative to gross premium written to develop a range of credit loss rates for each dollar of gross written premium underwritten. Additionally, an expected credit loss for amounts due from insureds under high deductible and retrospectively rated policies is calculated on a pool basis, informed by historical default rate data obtained from major rating agencies. Changes in the allowance are presented as a component of Other operating expenses on the Consolidated Statements of Operations. Amounts are considered past due based on policy payment terms. Insurance receivables and any related allowance are written off after collection efforts are exhausted or a negotiated settlement is reached. CNA’s non-insurance warranty revenues are primarily generated from separately-priced service contracts that provide mechanical breakdown and other coverages to vehicle or consumer goods owners, which generally provide coverage from one month to ten years. For warranty products where CNA acts as the principal in the transaction, Non-insurance warranty revenue is reported on a gross basis, with amounts paid by customers reported as Non-insurance warranty revenue and commissions paid to agents and dealers reported as Non-insurance warranty expense on the Consolidated Statements of Operations. Additionally, CNA provides warranty administration services for dealer and manufacturer warranty products. Non-insurance revenues are recognized when obligations under the terms of the contract with CNA’s customers are satisfied, which is generally over time as obligations are fulfilled. CNA recognizes non-insurance warranty revenue over the service period in proportion to the actuarially determined expected claims emergence pattern. Customers predominantly pay in full at the inception of the warranty contract. The liability for unearned warranty revenue, reported as Deferred non-insurance warranty revenue on the Consolidated Balance Sheets, represents the unearned portion of revenue in advance of CNA’s performance, including amounts which are refundable upon cancellation. Contract costs to obtain or fulfill non-insurance warranty contracts with customers are deferred and recorded as Deferred non-insurance warranty acquisition expenses on the Consolidated Balance Sheets. These costs are expected to be recoverable over the term of the contract and are amortized in the same manner the related revenue is recognized. CNA evaluates deferred costs for recoverability including consideration of anticipated investment income. Adjustments to deferred costs, if necessary, are recorded in the current period results of operations. Boardwalk Pipelines primarily earns revenues by providing transportation and storage services for natural gas and natural gas liquids, olefins and other hydrocarbons (referred to together as “NGLs”) on a firm and interruptible basis and providing ethane supply and transportation services for industrial customers in Louisiana and Texas. Boardwalk Pipelines also provides interruptible natural gas parking and lending services. The majority of Boardwalk Pipelines’ operating subsidiaries are subject to Federal Energy Regulatory Commission (“FERC”) regulations and certain revenues collected, under certain circumstances, may be subject to possible refunds to its customers. An estimated refund liability is recorded considering regulatory proceedings, advice of counsel and estimated total exposure. The majority of Boardwalk Pipelines’ revenues are from firm service contracts which are accounted for as a single promise to stand ready each month of the contract term to provide the committed capacity for either transportation or storage services. The transaction price is comprised of a fixed fee based on the capacity reserved plus a usage fee paid on the volume of commodity transported or injected and withdrawn from storage. Both the fixed and the usage fees are allocated to the single performance obligation of providing transportation or storage service and recognized over time as control is passed to the customer. These service contracts can range in term from one Loews Hotels & Co provides lodging and related goods and services as well as management and marketing services. Lodging and related revenues are recognized as the guest takes possession of the goods or receives the services. Management and marketing services revenues are recognized as the services are provided and billed on a monthly basis. In addition, Loews Hotels & Co recognizes revenue for the reimbursement of payroll and other expenses as they are incurred on behalf of the owners of joint venture and managed hotel properties. Claim and claim adjustment expense reserves – Claim and claim adjustment expense reserves, except reserves for structured settlements not associated with asbestos and environmental pollution (“A&EP”) and workers’ compensation lifetime claims, are not discounted and are based on (i) case basis estimates for losses reported on direct business, adjusted in the aggregate for ultimate loss expectations; (ii) estimates of incurred but not reported losses; (iii) estimates of losses on assumed reinsurance; (iv) estimates of future expenses to be incurred in the settlement of claims; (v) estimates of salvage and subrogation recoveries and (vi) estimates of amounts due from insureds related to losses under high deductible policies. Management considers current conditions and trends as well as past CNA and industry experience in establishing these estimates. The effects of inflation, which can be significant, are implicitly considered in the reserving process and are part of the recorded reserve balance. Ceded claim and claim adjustment expense reserves are reported as a component of Receivables on the Consolidated Balance Sheets. Claim and claim adjustment expense reserves are presented net of anticipated amounts due from insureds related to losses under deductible policies of $1.3 billion and $1.2 billion as of December 31, 2024 and 2023. A significant portion of these amounts are supported by collateral. CNA also has an allowance for uncollectible deductible amounts, which is presented as a component of the allowance for doubtful accounts included in Receivables on the Consolidated Balance Sheets. Structured settlements have been negotiated for certain property and casualty insurance claims. Structured settlements are agreements to provide fixed periodic payments to claimants. CNA’s obligations for structured settlements not funded by annuities are included in claim and claim adjustment expense reserves and are discounted at a weighted average interest rate of 6.6% and 6.4% as of December 31, 2024 and 2023. This interest rate is based on the expected yield of the assets that support the reserves and reinvestment assumptions. As of December 31, 2024 and 2023, the discounted reserves for unfunded structured settlements were $444 million and $465 million, net of discount of $535 million and $559 million. For the years ended December 31, 2024, 2023 and 2022, the amount of interest recognized on the discounted reserves of unfunded structured settlements was $33 million, $34 million and $36 million. This interest accretion is presented as a component of Insurance claims and policyholders’ benefits on the Consolidated Statements of Operations but is excluded from the disclosure of prior year loss reserve development. Workers’ compensation lifetime claim reserves are calculated using mortality assumptions determined through statutory regulation and economic factors. As of December 31, 2024 and 2023, workers’ compensation lifetime claim reserves are discounted at a 3.5% interest rate. As of December 31, 2024 and 2023, the discounted reserves for workers’ compensation lifetime claim reserves were $179 million and $196 million, net of discount of $80 million and $88 million. For the years ended December 31, 2024, 2023 and 2022, the amount of interest accretion recognized on the discounted reserves of workers’ compensation lifetime claim reserves was $6 million, $9 million and $9 million. This interest accretion is presented as a component of Insurance claims and policyholders’ benefits on the Consolidated Statements of Operations, but is excluded from the disclosure of prior year loss reserve development. Future policy benefit reserves – Future policy benefit reserves are associated with CNA’s run-off long-term care business 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. The liability for future policyholder benefits (“LFPB”) is computed using the net level premium method, which incorporates cash flow and discount rate assumptions. Under the net level premium method, the LFPB is equal to the present value of future benefits and claim settlement expenses less the present value of future net premiums. Net premiums are equal to gross premiums multiplied by the Net Premium Ratio (“NPR”). The NPR is generally the ratio of the present value of benefits and expense payments to the present value of gross premiums, expected over the lifetime of the policy. As a result of the modified retrospective adoption of ASU 2018-12, CNA’s NPR calculation incorporates the original locked in discount rate and the reserve balance as of the transition date of January 1, 2021. The key cash flow assumptions used to estimate the LFPB are morbidity, persistency, anticipated future premium rate increases and expenses. Morbidity is the frequency and severity of injury, illness, sickness and diseases contracted. Persistency is the percentage of policies remaining in force and can be affected by policy lapses, benefit reductions and death. Future premium rate increases are generally subject to regulatory approval, and therefore the exact timing and size of the approved rate increases are unknown. Expense assumptions relate to claim adjudication. The practical expedient was not elected that allows locking in the expense assumption. The carried LFPB discount rate is determined using the upper-medium grade fixed income instrument yield curve. CNA has elected to update the NPR and the LFPB for actual experience on a quarterly basis. A quarterly assessment is also made as to whether evidence suggests that cash flow assumptions should be updated. Annually, in the third quarter, actuarial analysis is performed on policyholder morbidity, persistency, premium rate increase and expense experience. This analysis, combined with judgment, informs the setting of updated cash flow assumptions used to estimate the LFPB. Actuarial analysis includes predictive modeling, actual to expected experience comparisons and trend analysis. Applicable industry research is also considered. The effect of changes in cash flow assumptions and actual variances from expected experience are recorded in the results of operations within Insurance claims and policyholders’ benefits. Quarterly, to derive the upper-medium grade fixed income instrument yield discount rate assumption, a published spot rate curve constructed from single-A rated U.S. dollar denominated corporate bonds is used. Linear interpolation to determine yield assumptions for tenors that fall between points for which observable rates are available is used. For cash flows that are projected to occur beyond the tenor for which market-observable rates are available, CNA applies judgment to estimate a normative rate which it grades to over 10 years. The effect of changes in discount rate assumptions are recorded in Other comprehensive income (loss). Quarterly, the updated NPR is used to derive an updated LFPB as of the beginning of the current quarter measured at the original locked in discount rate. The updated LFPB is then compared to the existing carrying amount of the liability as of the same date (measured at the original locked in discount rate) to determine the re-measurement gain (loss), which is presented parenthetically within the Insurance claims and policyholders’ benefits line on the Consolidated Statements of Operations. Insurance contracts are grouped into cohorts according to issue year. Contracts assumed through reinsurance are generally included within the same cohorts as contracts issued directly, according to issue year. The issue year for assumed contracts is defined according to the date that assumption of insurance risk incepted. For assumed contracts that were reinsured concurrently with the issuance of the underlying direct contract, issue year is defined as the year that the underlying policy was issued. For contracts that were already in-force when assumed, issue year is defined as the year in which the reinsurance agreement incepted. For group long-term care business, issue year is defined as the year the individual insurance certificate was issued. Long-term care is CNA’s only long-duration product line, therefore, cohorts are not further disaggregated by product. Insurance-related assessments – Liabilities for insurance-related assessments are accrued when an assessment is probable, when it can be reasonably estimated and when the event obligating the entity to pay an imposed or probable assessment has occurred. Liabilities for insurance-related assessments are not discounted and are included as part of Other liabilities on the Consolidated Balance Sheets. As of December 31, 2024 and 2023, the liability balances were $86 million and $84 million. Reinsurance – Reinsurance accounting allows for contractual cash flows to be reflected as premiums and losses. To qualify for reinsurance accounting, reinsurance agreements must include risk transfer. To meet risk transfer requirements, a reinsurance contract must include both insurance risk, consisting of underwriting and timing risk, and a reasonable possibility of a significant loss for the assuming entity. Reinsurance receivables related to paid losses are presented at unpaid balances. Reinsurance receivables related to unpaid losses are estimated in a manner consistent with claim and claim adjustment expense reserves or future policy benefit reserves. Reinsurance receivables are reported net of an allowance for doubtful accounts on the Consolidated Balance Sheets. The cost of reinsurance is primarily accounted for over the life of the underlying reinsured policies using assumptions consistent with those used to account for the underlying policies or over the reinsurance contract period. The ceding of insurance does not discharge the primary liability of CNA. As of December 31, 2024 and 2023, an allowance for doubtful accounts of $21 million and $22 million have been established for each year for reinsurance receivables, which relates to both amounts already billed on ceded paid losses as well as ceded reserves that will be billed when losses are paid in the future. For assessing expected credit losses, CNA separates reinsurance receivables into two pools: voluntary reinsurance receivables and involuntary receivables related to mandatory pools. CNA has not recorded an allowance for involuntary pools as there is no perceived credit risk. The principal credit quality indicator used in the valuation of the allowance on voluntary reinsurance receivables is the financial strength rating of the reinsurer sourced from major rating agencies. If the reinsurer is unrated, an internal financial strength rating is assigned based on CNA’s historical loss experience and the assessment of the reinsurance counterparty’s risk profile, which generally corresponds with a B rating. Reinsurer financial strength ratings are updated and reviewed on an annual basis or sooner if CNA becomes aware of significant changes related to a reinsurer. The allowance for doubtful accounts on reinsurance receivables is estimated on the basis of periodic evaluations of balances due from reinsurers, reinsurer financial strength rating and solvency, industry experience and current and forecast economic conditions. Because billed receivables generally approximate 6% or le

Acquisitions, Divestitures and

Acquisitions, Divestitures and Deconsolidations	12 Months Ended
	Dec. 31, 2024
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
Acquisitions, Divestitures and Deconsolidations	Acquisitions, Divestitures and Deconsolidations Boardwalk Pipelines On September 29, 2023, Boardwalk Pipelines acquired 100% of the equity interests of Williams Olefins Pipeline Holdco LLC (“Bayou Ethane”) from Williams Field Services Group, LLC for $355 million in cash. Loews Hotels & Co During 2024, Loews Hotels & Co acquired all the remaining outstanding noncontrolling equity interests of two owned and consolidated hotels for $44 million. During 2024 , Loews Hotels & Co received proceeds of $23 million for the sale of an owned hotel. During 2023, Loews Hotels & Co paid $46 million to acquire an additional equity interest in a previously unconsolidated joint venture property. The acquisition resulted in Loews Hotels & Co consolidating the joint venture property and recording a gain of $46 million ( $36 million after tax) . Upon acquisition, $232 million in assets and $120 million in liabilities were consolidated at fair value .

Investments

Investments	12 Months Ended
	Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Investments	Investments Net investment income is as follows: Year Ended December 31 2024 2023 2022 (In millions) Fixed maturity securities $ 2,050 $ 1,941 $ 1,787 Limited partnership investments 271 177 (6) Short-term investments 90 78 17 Equity securities (a) 82 63 23 Income from trading portfolio (a) 255 125 Other 129 105 65 Total investment income 2,877 2,489 1,886 Investment expenses (97) (94) (84) Net investment income $ 2,780 $ 2,395 $ 1,802 (a) Net investment income recognized due to the change in fair value of equity and trading portfolio securities held as of December 31, 2024 , 2023 and 2022 $ 93 $ 38 $ 3 As of December 31, 2024 and 2023, no investments in a single issuer exceeded 10% of shareholders’ equity, other than investments in securities issued by the U.S. Treasury and obligations of government-sponsored enterprises. Investment gains (losses) are as follows: Year Ended December 31 2024 2023 2022 (In millions) Fixed maturity securities: Gross gains $ 48 $ 75 $ 120 Gross losses (150) (166) (261) Investment losses on fixed maturity securities (102) (91) (141) Equity securities (a) 21 4 (116) Derivative instruments (1) 64 Short-term investments and other (11) (6) Gain on acquisition of a joint venture (see Note 2) 46 Investment losses $ (81) $ (53) $ (199) (a) Investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock included within equity securities held as of December 31, 2024, 2023, and 2022 $ 19 $ 14 $ (75) Investment gains (losses) for the year ended December 31, 2022 in the table above include an $18 million net gain related to the novation of a coinsurance agreement on CNA’s legacy annuity business, which was transacted on a funds withheld basis and gave rise to an embedded derivative. The net gain of $18 million is comprised of a $62 million gain on the associated embedded derivative partially offset by a $44 million loss on fixed maturity securities supporting the funds withheld liability, transferred with the novation, to recognize unrealized losses which had been included in AOCI since the inception of the coinsurance agreement. Taken together, this net gain is the final recognition of changes in the valuation of the funds held assets and offsets previously recognized investment losses on the associated embedded derivative. The coinsurance agreement was novated in the fourth quarter of 2022. 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: Year Ended December 31 2024 2023 2022 (In millions) Fixed maturity securities available-for-sale: Corporate and other bonds $ 34 $ 33 $ 62 Asset-backed 29 11 Impairment losses recognized in earnings $ 63 $ 44 $ 62 No losses were recognized on mortgage loans during the year ended December 31, 2024. For the years ended December 31, 2023 and 2022, there were $11 million and $8 million of losses related to mortgage loans primarily due to changes in expected credit losses. The net change in unrealized gains (losses) on fixed maturity securities, was $(352) million, $1.4 billion and $(7.9) billion for the years ended December 31, 2024, 2023 and 2022. The amortized cost and fair values of fixed maturity securities are as follows: December 31, 2024 Cost or Amortized Cost Gross Unrealized Gross Unrealized Allowance Estimated (In millions) Fixed maturity securities: Corporate and other bonds $ 25,839 $ 423 $ 1,305 $ 13 $ 24,944 States, municipalities and political 7,396 243 835 6,804 Asset-backed: Residential mortgage-backed 3,725 7 488 3,244 Commercial mortgage-backed 1,779 11 141 18 1,631 Other asset-backed 3,770 24 239 14 3,541 Total asset-backed 9,274 42 868 32 8,416 U.S. Treasury and obligations of 220 1 1 220 Foreign government 701 6 30 677 Fixed maturities available-for-sale $ 43,430 $ 715 $ 3,039 $ 45 $ 41,061 Fixed maturities trading 766 766 Total fixed maturity securities $ 44,196 $ 715 $ 3,039 $ 45 $ 41,827 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 maturities 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 December 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 $ 5,846 $ 165 $ 10,388 $ 1,140 $ 16,234 $ 1,305 States, municipalities and political 1,247 52 2,967 783 4,214 835 Asset-backed: Residential mortgage-backed 849 22 2,010 466 2,859 488 Commercial mortgage-backed 180 2 988 139 1,168 141 Other asset-backed 680 21 1,557 218 2,237 239 Total asset-backed 1,709 45 4,555 823 6,264 868 U.S. Treasury and obligations of 49 1 41 90 1 Foreign government 118 3 368 27 486 30 Total fixed maturity securities $ 8,969 $ 266 $ 18,319 $ 2,773 $ 27,288 $ 3,039 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. December 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 $ 2,567 $ 373 $ 2,273 $ 309 AAA 1,800 282 1,524 261 AA 4,247 730 3,817 658 A 6,330 582 5,652 517 BBB 11,548 980 11,523 1,095 Non-investment grade 796 92 942 155 Total $ 27,288 $ 3,039 $ 25,731 $ 2,995 Base d on current facts and circumstances, the unrealized losses presented in the December 31, 2024 securities in the gross unrealized loss position table above are not indicative of the ultimate collectability 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 at December 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 Year Ended December 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: Securities for which credit losses were not previously recorded 9 18 27 Available-for-sale securities accounted for as PCD assets 4 4 Reductions to the allowance for credit losses: Securities sold during the period (realized) 3 1 4 Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis 1 1 Write-offs charged against the allowance 9 9 Additional increases to the allowance for credit losses on securities that had an allowance recorded in a previous period 12 12 Total allowance for credit losses $ 13 $ 32 $ 45 Year Ended December 31, 2023 Corporate Asset-backed Total (In millions) Allowance for credit losses: Balance as of January 1, 2023 $ — $ 1 $ 1 Additions to the allowance for credit losses: Securities for which credit losses were not previously recorded 10 7 17 Available-for-sale securities accounted for as PCD assets 22 22 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 security before recovery of its amortized cost basis 8 8 Write-offs charged against the allowance 15 15 Additional increases to the allowance for credit losses on securities that had an allowance recorded in a previous period 1 4 5 Total allowance for credit losses $ 4 $ 12 $ 16 Contractual Maturity The following table presents available-for-sale fixed maturity securities by contractual maturity. December 31 2024 2023 Cost or Amortized Cost Estimated Fair Cost or Amortized Cost Estimated (In millions) Due in one year or less $ 1,761 $ 1,753 $ 1,121 $ 1,091 Due after one year through five years 11,678 11,403 11,563 11,180 Due after five years through ten years 13,083 12,365 13,359 12,573 Due after ten years 16,908 15,540 16,371 15,581 Total $ 43,430 $ 41,061 $ 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. Limited Partnerships The carrying value of limited partnerships as of December 31, 2024 and 2023 was approximately $2.5 billion and $2.2 billion, which includes net undistributed earnings of $334 million and $250 million. Limited partnerships comprising 14% of the total carrying value are reported on a current basis through December 31, 2024 with no reporting lag, 3% of the total carrying value are reported on a one month lag and the remainder are reported on more than a one month lag. The number of limited partnerships held and the strategies employed provide diversification to the limited partnership portfolio and the overall invested asset portfolio. Limited partnerships comprising 86% and 85% of the carrying value at December 31, 2024 and 2023 were invested in private debt and equity. Limited partnerships comprising 14% and 15% of the carrying value as of December 31, 2024 and 2023 employ hedge fund strategies. Private debt and equity funds cover a broad range of investment strategies including buyout, co-investment, private credit, growth capital, distressed investing and real estate. Hedge fund strategies include both long and short positions in fixed income, equity and derivative instruments. The ten largest limited partnership positions held totaled $648 million and $622 million as of December 31, 2024 and 2023. Based on the most recent information available regarding percentage ownership of the individual limited partnerships, the carrying value reflected on the Consolidated Balance Sheets represents approximately 1% of the aggregate partnership equity at December 31, 2024 and 2023, and the related income reflected on the Consolidated Statements of Operations represents approximately 1%, 1%, and 2% of the changes in aggregate partnership equity for the years ended December 31, 2024, 2023 and 2022. There are risks inherent in limited partnership investments which may result in losses due to short-selling, derivatives or other speculative investment practices. The use of leverage increases volatility generated by the underlying investment strategies. Private debt, private equity and other non-hedge fund limited partnership investments generally do not permit voluntary withdrawals. Hedge fund limited partnership investments contain withdrawal provisions that generally limit liquidity for a period of thirty days up to one year or longer. Typically, hedge fund withdrawals require advance written notice of up to 90 days. 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 December 31, 2024 2024 2023 2022 2021 2020 Prior Total (In millions) DSCR ≥1.6x LTV less than 55% $ 34 $ 9 $ 60 $ 169 $ 272 LTV 55% to 65% 15 $ 11 4 12 42 LTV greater than 65% 13 30 12 55 DSCR 1.2x - 1.6x LTV less than 55% $ 49 28 5 2 49 71 204 LTV 55% to 65% 53 30 21 30 20 39 193 LTV greater than 65% 46 46 DSCR ≤1.2x LTV less than 55% 21 21 LTV 55% to 65% 22 75 20 117 LTV greater than 65% 35 21 48 104 Total $ 102 $ 127 $ 236 $ 76 $ 133 $ 380 $ 1,054 (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 Derivatives may be used in the normal course of business, primarily in an attempt to reduce exposure to market risk (principally interest rate risk, credit risk, equity price risk, commodity price risk and foreign currency risk) stemming from various assets and liabilities. The principal objective under such strategies is to achieve the desired reduction in economic risk, even if the position does not receive hedge accounting treatment. Interest rate swaps, futures and forward commitments to purchase securities may be entered into to manage interest rate risk. Credit derivatives such as credit default swaps may be entered into to modify the credit risk inherent in certain investments. Forward contracts, futures, swaps and options may be used to manage foreign currency and commodity price risk. In addition to the derivatives used for risk management purposes described above, derivatives may also be used for purposes of income enhancement. Income enhancement transactions include interest rate swaps, call options, put options, credit default swaps, index futures and foreign currency forwards. See Note 4 for information regarding the fair value of derivative instruments. The following tables present the aggregate contractual or notional amount and estimated fair value related to derivative financial instruments. December 31 2024 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 $ 268 $ 2 $ 202 $ 1 Futures - short 167 1 116 Warrants 1 1 84 3 Interest rate swaps 300 4 300 13 Currency forwards 13 $ (1) Credit default swap index - purchased 2,000 In the fourth quarter of 2024, the Company entered into credit default swap index transactions that potentially benefit from widening investment grade credit spreads associated with the underlying securities that comprise the index. As of December 31, 2024 the notional value of the credit default swap index is $2 billion and the fair value is less than $1 million which is recognized in Payable to brokers in the Consolidated Balance Sheets. The fair value of the position is measured using observable market inputs, including credit spreads. For the year ended December 31, 2024 , Net investment income related to the position was less than $1 million. 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 December 31, 2024, commitments to purchase or fund were approximately $1.7 billion and to sell were approximately $30 million under the terms of these investments. Investments on Deposit Cash and securities with carrying values of approximately $3.1 billion were deposited by CNA’s insurance subsidiaries under requirements of regulatory authorities and others as of December 31, 2024 and 2023. Cash and securities with carrying values of approximately $0.7 billion and $0.9 billion were deposited with financial institutions in trust accounts or as collateral for letters of credit to secure obligations with various third parties as of December 31, 2024 and 2023.

Fair Value

Fair Value	12 Months Ended
	Dec. 31, 2024
Fair Value Disclosures [Abstract]
Fair Value	Fair Value Fair value is the price that would be received upon sale of an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The following fair value hierarchy is used in selecting inputs, with the highest priority given to Level 1, as these are the most transparent or reliable: • Level 1 – Quoted prices for identical instruments in active markets. • Level 2 – Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations in which all significant inputs are observable in active markets. • Level 3 – Valuations derived from valuation techniques in which one or more significant inputs are not observable. Prices may fall within Level 1, 2 or 3 depending upon the methodology and inputs used to estimate fair value for each specific security. In general, securities are priced using third party pricing services. Securities not priced by pricing services are submitted to independent brokers for valuation and, if those are not available, internally developed pricing models are used to value assets using a methodology and inputs that market participants presumably would use to value the assets. Prices obtained from third-party pricing services or brokers are not adjusted. Control procedures are performed over information obtained from pricing services and brokers to ensure prices received represent a reasonable estimate of fair value and to confirm representations regarding whether inputs are observable or unobservable. Procedures may include: (i) the review of pricing service methodologies or broker pricing qualifications, (ii) back-testing, where past fair value estimates are compared to actual transactions executed in the market on similar dates, (iii) exception reporting, where period-over-period changes in price are reviewed and challenged with the pricing service or broker based on exception criteria and (iv) detailed analysis, where an independent analysis of the inputs and assumptions used to price individual securities is performed. 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 U.S. Treasury, government-sponsored enterprises, foreign governments and redeemable preferred stock. December 31, 2024 Level 1 Level 2 Level 3 Total (In millions) Fixed maturity securities: Corporate bonds and other $ 223 $ 24,340 $ 1,278 $ 25,841 States, municipalities and political subdivisions 6,762 42 6,804 Asset-backed 7,540 876 8,416 Fixed maturities available-for-sale 223 38,642 2,196 41,061 Fixed maturities trading 766 766 Total fixed maturities $ 989 $ 38,642 $ 2,196 $ 41,827 Equity securities $ 603 $ 441 $ 20 $ 1,064 Short-term and other 4,383 70 4,453 Receivables 5 5 Payable to brokers (88) (88) 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 years ended December 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 December 31 Unrealized Gains (Losses) Recognized in Other Comprehensive Income (Loss) on Level 3 Assets and Liabilities Held at December 31 2024 Balance, January 1 Included in Net Income Included in OCI Purchases Sales Settlements Transfers into Transfers out of Level 3 Balance, December 31 (In millions) Fixed maturity securities: Corporate bonds and other $ 1,045 $ (1) $ (15) $ 352 $ (10) $ (104) $ 11 $ 1,278 $ (1) $ (21) States, municipalities and political subdivisions 44 (2) 42 (2) Asset-backed 901 9 (12) 125 (14) (83) $ (50) 876 (12) Fixed maturities available-for-sale $ 1,990 $ 8 $ (29) $ 477 $ (24) $ (187) $ 11 $ (50) $ 2,196 $ (1) $ (35) Equity securities $ 24 $ 12 $ 3 $ (19) $ 20 $ 8 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 December 31 Unrealized Gains (Losses) Recognized in Other Comprehensive Income (Loss) on Level 3 Assets and Liabilities Held at December 31 2023 Balance, January 1 Included in Net Income Included in OCI Purchases Sales Settlements Transfers into Transfers out of Level 3 Balance, December 31 (In millions) Fixed maturity securities: Corporate bonds and other $ 810 $ 38 $ 219 $ (33) $ 11 $ 1,045 $ 38 States, municipalities and political subdivisions 43 1 44 1 Asset-backed 788 $ 16 9 248 (64) 23 $ (119) 901 9 Fixed maturities available-for-sale $ 1,641 $ 16 $ 48 $ 467 $ — $ (97) $ 34 $ (119) $ 1,990 $ — $ 48 Equity securities $ 35 $ (7) $ (4) $ 24 $ (7) Net investment gains and losses are reported in Net income as follows: Major Category of Assets and Liabilities Consolidated 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 Securities may be transferred in or out of levels within the fair value hierarchy based on the availability of observable market information and quoted prices used to determine the fair value of the security. The availability of observable market information and quoted prices varies based on market conditions and trading volume. Valuation Methodologies and Inputs The following section describes the valuation methodologies and relevant inputs used to measure different financial instruments at fair value, including an indication of the level in the fair value hierarchy in which the instruments are generally classified. Fixed Maturity Securities Level 1 securities include highly liquid government securities and exchange traded bonds valued using quoted market prices. Level 2 securities include most other fixed maturity securities as the significant inputs are observable in the marketplace. All classes of Level 2 fixed maturity securities are valued using a methodology based on information generated by market transactions involving identical or comparable assets, a discounted cash flow methodology or a combination of both when necessary. Common inputs for all classes of fixed maturity securities include prices from recently executed transactions of similar securities, marketplace quotes, benchmark yields, spreads off benchmark yields, interest rates and U.S. Treasury or swap curves. Specifically for asset-backed securities, key inputs include prepayment and default projections based on past performance of the underlying collateral and current market data. Fixed maturity securities are primarily assigned to Level 3 in cases where broker/dealer quotes are significant inputs to the valuation, and there is a lack of transparency as to whether these quotes are based on information that is observable in the marketplace. Level 3 securities also include private placement debt securities whose fair value is determined using internal models with some inputs that are not market observable. Equity Securities Level 1 securities include publicly traded securities valued using quoted market prices. Level 2 securities are primarily valued using pricing for similar securities, recently executed transactions and other pricing models utilizing market observable inputs. Level 3 securities are primarily priced using broker/dealer quotes and internal models with some inputs that are not market observable. Derivative Financial Instruments Equity options are valued using quoted market prices and are classified within Level 1 of the fair value hierarchy. Over-the-counter derivatives, principally interest rate swaps, currency forwards, total return swaps, commodity swaps, credit default swaps, equity warrants and options, are valued using inputs including broker/dealer quotes and are classified within Level 2 or Level 3 of the valuation hierarchy, depending on the amount of transparency as to whether these quotes are based on information that is observable in the marketplace. Short-Term and Other Invested Assets Securities that are actively traded or have quoted prices are classified as Level 1. These securities include money market funds, treasury bills and exchange traded open-end funds valued using quoted market prices. Level 2 primarily includes non-U.S. government securities for which all inputs are market observable. Fixed maturity securities purchased within one year of maturity are classified consistent with fixed maturity securities discussed above. Short-term investments as presented in the tables above differ from the amounts presented on the Consolidated Balance Sheets because certain short-term investments, such as time deposits, are not measured at fair value. 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. December 31, 2024 Estimated Valuation Techniques Unobservable Inputs Range (Weighted Average) (In millions) Fixed maturity securities $ 1,724 Discounted cash flow Credit spread 1% — 6% (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 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 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 December 31, 2024 Level 1 Level 2 Level 3 Total (In millions) Assets: Other invested assets, primarily mortgage loans $ 1,019 $ 987 $ 987 Liabilities: Short-term debt 4 5 5 Long-term debt 8,936 $ 7,702 966 8,668 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 The fair values of debt were based on observable market prices when available. When observable market prices were not available, the fair values of debt were based on observable market prices of comparable instruments adjusted for differences between the observed instruments and the instruments being valued or is estimated using discounted cash flow analyses, based on current incremental borrowing rates for similar types of borrowing arrangements.

Receivables

Receivables	12 Months Ended
	Dec. 31, 2024
Receivables [Abstract]
Receivables	Receivables December 31 2024 2023 (In millions) Reinsurance (Note 17) $ 6,072 $ 5,434 Insurance 3,697 3,470 Receivable from brokers 50 64 Accrued investment income 458 446 Income taxes 9 21 Other, primarily customer accounts 284 277 Total 10,570 9,712 Less: allowance for doubtful accounts on reinsurance receivables 21 22 allowance for other doubtful accounts 27 30 Receivables $ 10,522 $ 9,660

Property, Plant and Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2024
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, Plant and Equipment December 31 2024 2023 (In millions) Pipeline equipment (net of accumulated depreciation of $4,819 and $4,470) $ 8,478 $ 8,421 Hotel properties (net of accumulated depreciation of $646 and $560) 1,517 1,072 Other (net of accumulated depreciation of $578 and $534) 496 461 Construction in process 247 764 Property, plant and equipment $ 10,738 $ 10,718 Depreciation expense and capital expenditures are as follows: Year Ended December 31 2024 2023 2022 Depre-ciation Capital Expend. Depre-ciation Capital Depre-ciation Capital Expend. (In millions) CNA Financial $ 59 $ 105 $ 54 $ 97 $ 49 $ 50 Boardwalk Pipelines 426 365 410 383 394 352 Loews Hotels & Co 93 115 69 201 64 264 Corporate 2 1 12 2 9 Total $ 580 $ 585 $ 534 $ 693 $ 509 $ 675 Capitalized interest related to the construction and upgrade of qualifying assets amounted to approximately $27 million, $32 million and $17 million for the years ended December 31, 2024, 2023 and 2022. Asset Impairments Loews Hotels & Co evaluates properties with indications that their carrying amounts may not be recoverable. It was determined that the carrying values of two properties in 2023 and two properties in 2022 were impaired. Loews Hotels & Co recorded aggregate impairment charges of $12 million ($9 million after tax) and $25 million ($19 million after tax) for the years ended December 31, 2023 and 2022, which are reported within Operating expenses and other on the Consolidated Statements of Operations. Loews Hotels & Co utilizes an undiscounted probability-weighted cash flow analysis in testing the recoverability of its long-lived assets for potential impairment. Assumptions and estimates underlying this analysis include, among other things, (i) room revenue based on occupancy and average room rates, (ii) other revenue generated by the property, including food and beverage sales and ancillary services, as well as property specific revenue sources, (iii) operating expenses, including management and marketing fees and (iv) expenditures for repairs and refurbishments to maintain the asset’s value. When necessary, scenarios are developed using multiple assumptions of expected future events which Loews Hotels & Co assigns a probability of occurrence based on management’s expectations. This initial analysis results in a projected probability-weighted cash flow of the property, which is compared to the carrying value of the asset to assess recoverability. If the long-lived asset’s carrying value exceeds the undiscounted cash flows, Loews Hotels & Co compares the long-lived asset’s carrying value to fair value, estimating the fair value of the asset by discounting future cash flows using market participant assumptions or third-party indicators of fair value such as a recent independent appraisal. These calculations, at times, utilize significant unobservable inputs, including estimating the growth in the asset’s revenue and cost structure and are therefore considered Level 3 fair value measurements.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets A summary of the changes in the carrying amount of goodwill is as follows: CNA Financial Boardwalk Pipelines Total (In millions) Balance, December 31, 2022 $ 109 $ 237 $ 346 Other adjustments 1 1 Balance, December 31, 2023 and 2024 110 237 347 A summary of the net carrying amount of other intangible assets is as follows: December 31, 2024 December 31, 2023 Gross Carrying Amount Accumulated Amortization Gross Carrying Amount Accumulated Amortization (In millions) Finite-lived intangible assets: Customer relationships $ 93 $ 24 $ 93 $ 21 Other 10 8 11 9 Total finite-lived intangible assets 103 32 104 30 Indefinite-lived intangible assets 76 77 Total other intangible assets $ 179 $ 32 $ 181 $ 30 Amortization expense for each of the years ended December 31, 2024, 2023 and 2022 of $4 million, $3 million, and $3 million is reported in Operating expenses and other on the Consolidated Statements of Operations. At December 31, 2024, estimated amortization expense in each of the next five years is approximately $4 million.

Claim and Claim Adjustment Expe

Claim and Claim Adjustment Expense Reserves	12 Months Ended
	Dec. 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. CNA’s commercial property and casualty insurance operations (“Property & Casualty Operations”) include its Specialty, Commercial and International lines of business. CNA’s Other Insurance Operations outside of Property & Casualty Operations include its long-term care business that is in run-off, certain corporate expenses, including interest on CNA’s corporate debt, and certain property and casualty businesses in run-off, including CNA Re, A&EP, a legacy portfolio of excess workers’ compensation policies and certain legacy mass tort reserves. Liability for Unpaid Claim and Claim Adjustment Expenses The table below reconciles the net liability for unpaid claim and claim adjustment expenses to the amount presented on the Consolidated Balance Sheets. December 31 2024 (In millions) Net liability for unpaid claim and claim adjustment expenses: Property & Casualty Operations $ 18,334 Other Insurance Operations (a) 929 Total net claim and claim adjustment expenses 19,263 Reinsurance receivables: (b) Property & Casualty Operations 3,348 Other Insurance Operations (c) 2,365 Total reinsurance receivables 5,713 Total gross liability for unpaid claims and claims adjustment expenses $ 24,976 (a) Other Insurance Operations amounts are related to unfunded structured settlements arising from short duration contracts. (b) Reinsurance receivables presented are gross of the allowance for uncollectible reinsurance and do not include reinsurance receivables related to paid losses. (c) The Other Insurance Operations reinsurance receivables are primarily related to A&EP claims covered under the A&EP loss portfolio transfer (“LPT”). The following table presents a reconciliation between beginning and ending claim and claim adjustment expense reserves. Year Ended December 31 2024 2023 2022 (In millions) Reserves, beginning of year: Gross $ 23,304 $ 22,120 $ 21,269 Ceded 5,141 5,191 4,969 Net reserves, beginning of year 18,163 16,929 16,300 Net incurred claim and claim adjustment expenses: Provision for insured events of current year 6,330 5,667 5,181 Increase (decrease) in provision for insured events of prior years 42 48 (32) Amortization of discount 39 44 44 Total net incurred (a) 6,411 5,759 5,193 Net payments attributable to: Current year events (1,093) (922) (821) Prior year events (4,096) (3,679) (3,481) Total net payments (5,189) (4,601) (4,302) Foreign currency translation adjustment and other (122) 76 (262) Net reserves, end of year 19,263 18,163 16,929 Ceded reserves, end of year 5,713 5,141 5,191 Gross reserves, end of year $ 24,976 $ 23,304 $ 22,120 (a) Total net incurred does not agree to Insurance claims and policyholders’ benefits as reflected on the Consolidated Statements of Operations due to amounts related to retroactive reinsurance deferred gain accounting and uncollectible reinsurance, which are not reflected in the table above. Reserving Methodology In developing claim and claim adjustment expense reserve estimates, CNA’s actuaries perform detailed reserve analyses that are staggered throughout the year. The data is organized at a reserve group level. Every reserve group is reviewed at least once during the year, but most are reviewed more frequently. The analyses generally review losses gross of ceded reinsurance and apply the ceded reinsurance terms to the gross estimates to establish estimates net of reinsurance. Factors considered include, but are not limited to, the historical pattern and volatility of the actuarial indications, the sensitivity of the actuarial indications to changes in paid and incurred loss patterns, the consistency of claims handling processes, the consistency of case reserving practices, changes in CNA’s pricing and underwriting, pricing and underwriting trends in the insurance market and legal, judicial, geopolitical, social and economic trends. In addition to the detailed analyses, CNA reviews actual loss emergence for all products each quarter. In developing the loss reserve estimates for property and casualty contracts, CNA generally projects ultimate losses using several common actuarial methods as listed below. CNA reviews the indications from the various methods and applies judgment to select an actuarial point estimate. The carried reserve may differ from the actuarial point estimate as a result of CNA’s consideration of the factors noted above as well as the potential volatility of the projections associated with the specific product being analyzed and other factors affecting claims costs that may not be quantifiable through traditional actuarial analysis. The indicated required reserve is the difference between the selected ultimate loss and the inception-to-date paid losses. The difference between the selected ultimate loss and the case incurred or reported loss is IBNR. IBNR includes a provision for development on known cases as well as a provision for late reported incurred claims. The most frequently utilized methods to project ultimate losses include the following: • Paid development : The paid development method estimates ultimate losses by reviewing paid loss patterns and applying them to accident years with further expected changes in paid losses. • Incurred development : The incurred development method is similar to the paid development method, but it uses case incurred losses instead of paid losses. • Loss ratio : The loss ratio method multiplies premiums by an expected loss ratio to produce ultimate loss estimates for each accident year. • Bornhuetter-Ferguson paid loss : The Bornhuetter-Ferguson paid loss method is a combination of the paid development approach and the loss ratio approach. This method normally determines expected loss ratios similar to the approach used to estimate the expected loss ratio for the loss ratio method. • Bornhuetter-Ferguson incurred loss : The Bornhuetter-Ferguson incurred loss method is similar to the Bornhuetter-Ferguson using premiums and paid loss method except that it uses case incurred losses. • Frequency times severity : The frequency times severity method multiplies a projected number of ultimate claims by an estimated ultimate average loss for each accident year to produce ultimate loss estimates. • Stochastic modeling : The stochastic modeling method produces a range of possible outcomes based on varying assumptions related to the particular product being modeled. For many exposures, especially those that can be considered long-tail, a particular accident or policy year may not have a sufficient volume of paid losses to produce a statistically reliable estimate of ultimate losses. In such a case, CNA’s actuaries typically assign more weight to the incurred development method than to the paid development method. As claims continue to settle and the volume of paid loss increases, the actuaries may assign additional weight to the paid development method. For most of CNA’s products, even the incurred losses for accident or policy years that are early in the claim settlement process will not be of sufficient volume to produce a reliable estimate of ultimate losses. In these cases, CNA may not assign much, if any weight to the paid and incurred development methods. CNA may use the loss ratio, Bornhuetter-Ferguson and/or frequency times severity methods. For short-tail exposures, the paid and incurred development methods can often be relied on sooner, primarily because CNA’s history includes a sufficient number of years to cover the entire period over which paid and incurred losses are expected to change. However, CNA may also use the loss ratio, Bornhuetter-Ferguson and/or frequency times severity methods for short-tail exposures. For other more complex reserve groups where the above methods may not produce reliable indications, CNA uses additional methods tailored to the characteristics of the specific situation . CNA’s reserving methodologies for mass tort and A&EP are similar as both are based on detailed reviews of large accounts with estimates of ultimate payments based on the facts in each case and CNA’s view of applicable law and coverage litigation. Gross and Net Carried Reserves The following tables present the gross and net carried reserves: December 31, 2024 Property and Casualty Operations Other Insurance Operations Total (In millions) Gross Case Reserves $ 6,589 $ 1,813 $ 8,402 Gross IBNR Reserves 15,093 1,481 16,574 Total Gross Carried Claim and Claim Adjustment Expense Reserves $ 21,682 $ 3,294 $ 24,976 Net Case Reserves $ 5,573 $ 634 $ 6,207 Net IBNR Reserves 12,761 295 13,056 Total Net Carried Claim and Claim Adjustment Expense Reserves $ 18,334 $ 929 $ 19,263 December 31, 2023 Gross Case Reserves $ 5,759 $ 1,979 $ 7,738 Gross IBNR Reserves 14,184 1,382 15,566 Total Gross Carried Claim and Claim Adjustment Expense Reserves $ 19,943 $ 3,361 $ 23,304 Net Case Reserves $ 4,978 $ 685 $ 5,663 Net IBNR Reserves 12,235 265 12,500 Total Net Carried Claim and Claim Adjustment Expense Reserves $ 17,213 $ 950 $ 18,163 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. The following table and discussion present details of the net prior year loss reserve development in Property & Casualty Operations and Other Insurance Operations: Year Ended December 31 2024 2023 2022 (In millions) Medical professional liability $ (8) $ 5 $ 18 Other professional liability and management liability 49 37 50 Surety (68) (43) (83) Warranty 20 (11) (21) Commercial auto 107 33 49 General liability 75 149 67 Workers’ compensation (202) (203) (152) Other property and casualty operations (4) 10 (24) Other insurance operations 79 71 64 Total pretax (favorable) unfavorable development $ 48 $ 48 $ (32) Development Tables For CNA’s Property & Casualty Operations, the following tables present further detail and commentary on the development reflected in the financial statements for each of the periods presented. Also presented are loss reserve development tables that illustrate the change over time of reserves established for claim and allocated claim adjustment expenses arising from short-duration insurance contracts for certain lines of business within CNA’s Property & Casualty Operations. Not all lines of business are presented based on their context to CNA’s overall loss reserves, calendar year reserve development, or calendar year net earned premiums. Insurance contracts are considered to be short-duration contracts when the contracts are not expected to remain in force for an extended period of time. The Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses tables, reading across, show the cumulative net incurred claim and allocated claim adjustment expenses relating to each accident year at the end of the stated calendar year. Changes in the cumulative amount across time are the result of CNA’s expanded awareness of additional facts and circumstances that pertain to the unsettled claims. The Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses tables, reading across, show the cumulative amount paid for claims for each accident year as of the end of the stated calendar year. The Net Strengthening or (Releases) of Prior Accident Year Reserves tables, reading across, show the net increase or decrease in the cumulative net incurred accident year claim and allocated claim adjustment expenses during each stated calendar year and indicates whether the reserves for that accident year were strengthened or released. The information in the tables is reported on a net basis after reinsurance and does not include the effects of discounting. The information contained in calendar years 2023 and prior is unaudited. To the extent CNA enters into a commutation, the transaction is reported on a prospective basis. To the extent that CNA enters into a disposition, the effects of the disposition are reported on a retrospective basis by removing the balances associated with it. The amounts reported for the cumulative number of reported claims include direct and assumed open and closed claims by accident year at the claimant level. The number excludes claim counts for claims within a policy deductible where the insured is responsible for payment of losses in the deductible layer. Claim count data for certain assumed reinsurance contracts is unavailable. In the loss reserve development tables, IBNR includes reserves for incurred but not reported losses and expected development on case reserves. CNA does not establish case reserves for allocated loss adjusted expenses (“ALAE”), therefore ALAE reserves are also included in the estimate of IBNR. 2024 Unfavorable development in other professional liability and management liability was primarily due to higher than expected claim severity and frequency in CNA’s professional errors and omissions (“E&O”) and cyber businesses. 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. Unfavorable development in commercial auto was due to higher than expected claim severity in recent accident years. Unfavorable development in general liability was due to higher than expected claim severity in multiple accident years going back to 2015. Favorable development in workers’ compensation was due to favorable medical trends driving lower than expected severity in multiple accident years. Unfavorable development in other insurance operations was largely associated with legacy mass tort abuse claims. 2023 Unfavorable development in other professional liability and management liability was primarily due to higher than expected claim severity and frequency in CNA’s professional E&O businesses in multiple accident years. Favorable development in surety was primarily due to lower than expected frequency and lack of systemic activity in multiple accident years. Favorable development in warranty was due to lower than expected loss emergence in a recent accident year. Unfavorable development in commercial auto was due to higher than expected claim severity in CNA’s construction business in a recent accident year. Unfavorable development in general liability was due to higher than expected claim severity in CNA’s construction and middle market businesses across multiple accident years. Favorable development in workers’ compensation was due to favorable medical trends driving lower than expected severity in multiple accident years. Unfavorable development in other insurance operations was largely associated with legacy mass tort abuse claims. 2022 Unfavorable development in medical professional liability was due to higher than expected large loss activity in multiple accident years. Unfavorable development in other professional liability and management liability was due to higher than expected claim severity and frequency in CNA’s cyber and professional E&O businesses in multiple accident years. Favorable development in surety was primarily due to lower than expected frequency and lack of systemic activity in recent accident years. Favorable development in warranty was due to lower than expected loss emergence in a recent accident year. Unfavorable development in commercial auto and general liability was due to higher than expected claim severity across multiple accident years. Favorable development in workers’ compensation was due to favorable medical trends driving lower than expected severity in multiple accident years. Unfavorable development in other insurance operations was largely associated with legacy mass tort abuse claims, including the Diocese of Rochester proposed settlement. Property & Casualty Operations – Line of Business Composition The table below presents the net liability for unpaid claim and claim adjustment expenses, by line of business for Property & Casualty Operations: December 31 2024 (In millions) Medical professional liability $ 1,425 Other professional liability and management liability 3,967 Surety 493 Warranty 46 Commercial auto 1,247 General liability 4,356 Workers’ compensation 3,543 Other property and casualty operations 3,257 Total net liability for unpaid claim and claim adjustment expenses $ 18,334 Medical Professional Liability Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses December 31, 2024 December 31 2015 (a) 2016 (a) 2017 (a) 2018 (a) 2019 (a) 2020 (a) 2021 (a) 2022 (a) 2023 (a) 2024 IBNR Cumulative Number of Claims (In millions, except reported claims data) Accident Year 2015 $ 433 $ 499 $ 510 $ 494 $ 488 $ 510 $ 501 $ 498 $ 494 $ 494 $ 11 18,228 2016 427 487 485 499 508 510 508 514 513 16 16,195 2017 412 449 458 460 455 460 456 463 18 15,384 2018 404 429 431 448 470 495 499 28 15,331 2019 430 445 458 471 469 481 43 14,515 2020 477 476 455 447 419 100 11,289 2021 377 376 374 349 117 9,935 2022 329 329 333 143 9,965 2023 340 350 162 10,424 2024 343 278 8,561 Total $ 4,244 $ 916 Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses Accident Year 2015 $ 22 $ 101 $ 230 $ 313 $ 384 $ 420 $ 444 $ 458 $ 463 $ 471 2016 18 121 246 339 401 436 460 483 489 2017 19 107 235 308 355 388 417 427 2018 21 115 211 290 349 418 453 2019 17 91 183 280 349 395 2020 11 61 139 201 258 2021 11 49 118 170 2022 10 57 122 2023 14 86 2024 13 Total $ 2,884 Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented $ 1,360 Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2015 33 Liability for unallocated claim adjustment expenses for accident years presented 32 Total net liability for unpaid claim and claim adjustment expenses $ 1,425 Net Strengthening (Releases) of Prior Accident Year Reserves Years Ended December 31 Total Accident Year 2015 $ 66 $ 11 $ (16) $ (6) $ 22 $ (9) $ (3) $ (4) $ — $ 61 2016 60 (2) 14 9 2 (2) 6 (1) 86 2017 37 9 2 (5) 5 (4) 7 51 2018 25 2 17 22 25 4 95 2019 15 13 13 (2) 12 51 2020 (1) (21) (8) (28) (58) 2021 (1) (2) (25) (28) 2022 — 4 4 2023 10 10 Total net development for the accident years presented above 13 11 (17) Total net development for accident years prior to 2015 — (6) 9 Total unallocated claim adjustment expense development 5 — — Total $ 18 $ 5 $ (8) (a) Data presented for these calendar years is required supplemental information, which is unaudited. Other Professional Liability and Management Liability Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses December 31, 2024 December 31 2015 (a) 2016 (a) 2017 (a) 2018 (a) 2019 (a) 2020 (a) 2021 (a) 2022 (a) 2023 (a) 2024 IBNR Cumulative Number of Claims (In millions, except reported claims data) Accident Year 2015 $ 888 $ 892 $ 877 $ 832 $ 807 $ 813 $ 836 $ 855 $ 858 $ 865 $ 21 17,457 2016 901 900 900 904 907 891 888 906 912 37 17,989 2017 847 845 813 791 775 758 746 752 51 18,215 2018 850 864 869 906 923 941 987 57 20,071 2019 837 845 856 876 939 970 96 19,548 2020 930 944 951 945 945 168 19,509 2021 1,037 1,038 1,009 965 311 18,377 2022 1,120 1,112 1,084 465 18,376 2023 1,149 1,166 564 19,587 2024 1,150 918 17,921 Total $ 9,796 $ 2,688 Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses Accident Year 2015 $ 60 $ 234 $ 404 $ 542 $ 612 $ 677 $ 725 $ 794 $ 808 $ 813 2016 64 248 466 625 701 736 784 826 856 2017 57 222 394 498 557 596 630 672 2018 54 282 473 599 706 779 847 2019 64 263 422 567 699 801 2020 67 248 400 523 660 2021 58 217 356 502 2022 64 225 453 2023 64 302 2024 77 Total $ 5,983 Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented $ 3,813 Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2015 98 Liability for unallocated claim adjustment expenses for accident years presented 56 Total net liability for unpaid claim and claim adjustment expenses $ 3,967 Net Strengthening (Releases) of Prior Accident Year Reserves Years Ended December 31 Total Accident Year 2015 $ 4 $ (15) $ (45) $ (25) $ 6 $ 23 $ 19 $ 3 $ 7 $ (23) 2016 (1) — 4 3 (16) (3) 18 6 11 2017 (2) (32) (22) (16) (17) (12) 6 (95) 2018 14 5 37 17 18 46 137 2019 8 11 20 63 31 133 2020 14 7 (6) — 15 2021 1 (29) (44) (72) 2022 (8) (28) (36) 2023 17 17 Total net development for the accident years presented above 44 47 41 Total net development for accident years prior to 2015 6 (10) 3 Total unallocated claim adjustment expense development — — 5 Total $ 50 $ 37 $ 49 (a) Data presented for these calendar years is required supplemental information, which is unaudited. Surety Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses December 31, 2024 December 31 2015 (a) 2016 (a) 2017 (a) 2018 (a) 2019 (a) 2020 (a) 2021 (a) 2022 (a) 2023 (a) 2024 IBNR Cumulative Number of Claims (In millions, except reported claims data) Accident Year 2015 $ 131 $ 131 $ 104 $ 79 $ 63 $ 58 $ 53 $ 45 $ 45 $ 45 $ 2 5,103 2016 124 124 109 84 67 64 58 43 43 3 5,577 2017 120 115 103 84 71 66 67 67 3 5,909 2018 114 108 91 62 56 51 49 6 6,297 2019 119 112 98 87 82 82 8 6,229 2020 128 119 81 67 57 3 4,827 2021 137 129 110 91 45 4,884 2022 155 158 132 74 4,893 2023 175 169 138 4,378 2024 171 145 2,940 Total $ 906 $ 427 Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses Accident Year 2015 $ 7 $ 26 $ 38 $ 40 $ 42 $ 44 $ 42 $ 42 $ 43 $ 43 2016 5 37 45 45 43 43 41 40 40 2017 23 37 41 46 49 62 62 63 2018 5 25 34 39 40 41 41 2019 12 34 44 59 70 74 2020 4 20 28 33 44 2021 5 20 35 42 2022 12 35 52 2023 8 27 2024 20 Total $ 446 Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented $ 460 Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2015 14 Liability for unallocated claim adjustment expenses for accident years presented 19 Total net liability for unpaid claim and claim adjustment expenses $ 493 Net Strengthening (Releases) of Prior Accident Year Reserves Years Ended December 31 Total Accident Year 2015 $ — $ (27) $ (25) $ (16) $ (5) $ (5) $ (8) $ — $ — $ (86) 2016 — (15) (25) (17) (3) (6) (15) — (81) 2017 (5) (12) (19) (13) (5) 1 — (53) 2018 (6) (17) (29) (6) (5) (2) (65) 2019 (7) (14) (11) (5) — (37) 2020 (9) (38) (14) (10) (71) 2021 (8) (19) (19) (46) 2022 3 (26) (23) 2023 (6) (6) Total net development for the accident years presented above (82) (54) (63) Total net development for accident years prior to 2015 (1) 11 (5) Total unallocated claim adjustment expense development — — — Total $ (83) $ (43) $ (68) (a) Data presented for these calendar years is required supplemental information, which is unaudited. Commercial Auto Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses December 31, 2024 December 31 2015 (a) 2016 (a) 2017 (a) 2018 (a) 2019 (a) 2020 (a) 2021 (a) 2022 (a) 2023 (a) 2024 IBNR Cumulative (In millions, except reported claims data) Accident Year 2015 $ 201 $ 199 $ 190 $ 190 $ 183 $ 181 $ 183 $ 182 $ 184 $ 184 $ 2 30,430 2016 198 186 186 186 190 195 200 197 195 1 30,457 2017 199 198 200 221 232 239 241 241 4 30,947 2018 229 227 227 245 254 255 260 2 34,333 2019 257 266 289 323 325 327 7 37,280 2020 310 303 304 298 303 14 29,182 2021 397 388 390 393 51 33,028 2022 437 465 496 90 37,230 2023 554 620 202 42,345 2024 726 447 40,718 Total $ 3,745 $ 820 Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses Accident Year 2015 $ 52 $ 96 $ 130 $ 153 $ 172 $ 175 $ 178 $ 179 $ 180 $ 182 2016 52 93 126 154 175 185 190 192 193 2017 58 107 150 178 203 225 232 235 2018 66 128 175 212 238 249 256 2019 77 147 203 257 295 312 2020 71 134 197 246 276 2021 83 168 240 305 2022 112 236 334 2023 127 270 2024 153 Total $ 2,516 Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented $ 1,229 Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2015 1 Liability for unallocated claim adjustment expenses for accident years presented 17 Total net liability for unpaid claim and claim adjustment expenses $ 1,247 Net Strengthening (Releases) of Prior Accident Year Reserves Years Ended December 31 Total Accident Year 2015 $ (2) $ (9) $ — $ (7) $ (2) $ 2 $ (1) $ 2 $ — $ (17) 2016 (12) — — 4 5 5 (3) (2) (3) 2017 (1) 2 21 11 7 2 — 42 2018 (2) — 18 9 1 5 31 2019 9 23 34 2 2 70 2020 (7) 1 (6) 5 (7) 2021 (9) 2 3 (4) 2022 28 31 59 2023 66 66 Total net development for the accident years presented above 46 28 110 Total net development for accident years prior to 2015 3 2 (3) Total unallocated claim adjustment expense development — 3 — Total $ 49 $ 33 $ 107 (a) Data presented for these calendar years is required supplemental information, which is unaudited. General Liability Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses December 31, 2024 December 31 2015 (a) 2016 (a) 2017 (a) 2018 (a) 2019 (a) 2020 (a) 2021 (a) 2022 (a) 2023 (a) 2024 IBNR Cumulative Number of Claims (In millions, except reported claims data) Accident Year 2015 $ 581 $ 576 $ 574 $ 589 $ 600 $ 602 $ 617 $ 625 $ 639 $ 656 $ 39 24,309 2016 623 659 667 671 673 683 684 704 712 27 24,901 2017 632 632 632 634 630 652 690 713 16 22,544 2018 653 644 646 639 650 679 665 83 20,553 2019 680 682 682 691 720 727 129 19,907 2020 723 722 726 736 702 237 14,964 2021 782 784 793 814 299 15,952 2022 929 928 930 515 17,527 2023 1,071 1,106 726 17,037 2024 1,271 1,144 14,632 Total $ 8,296 $ 3,215 Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses Accident Year 2015 $ 19 $ 110 $ 230 $ 357 $ 446 $ 501 $ 530 $ 561 $ 573 $ 581 2016 32 163 279 407 481 524 582 620 652 2017 23 118 250 399 471 553 606 657 2018 33 107 228 307 428 491 546 2019 25 98 181 322 455 532 2020 23 99 192 280 367 2021 26 140 262 391 2022 29 123 260 2023 33 153 2024 34 Total $ 4,173 Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented $ 4,123 Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2015 171 Liability for unallocated claim adjustment expenses for accident years presented 62 Total net liability for unpaid claim and claim adjustment expenses $ 4,356 Net Strengthening (Releases) of Prior Accident Year Reserves Years Ended December 31 Total Accident Year 2015 $ (5) $ (2) $ 15 $ 11 $ 2 $ 15 $ 8 $ 14 $ 17 $ 75 2016 36 8 4 2 10 1 20 8 89 2017 — — 2 (4) 22 38 23 81 2018 (9) 2 (7) 11 29 (14) 12 2019 2 — 9 29 7 47 2020 (1) 4 10 (34) (21) 2021 2 9 21 32 2022 (1) 2 1 2023 35 35 Total net development for the accident years presented above 57 148 65 Total net development for accident years prior to 2015 10 1 10 Total unallocated claim adjustment expense development — — — Total $ 67 $ 149 $ 75 (a) Data presented for these calendar years is required supplemental information, which is unaudited. Workers’ Compensation Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses December 31, 2024 December 31 2015 (a) 2016 (a) 2017 (a) 2018 (a) 2019 (a) 2020 (a) 2021 (a) 2022 (a) 2023 (a) 2024 IBNR Cumulative Number of Claims (In millions, except reported claims data) Accident Year 2015 $ 422 $ 431 $ 406 $ 408 $ 394 $ 382 $ 372 $ 353 $ 334 $ 324 $ 45 31,916 2016 426 405 396 382 366 355 331 308 293 45 32,000 2017 440 432 421 400 402 399 398 383 65 33,156 2018 450 440 428 415 415 404 399 65 34,914 2019 452 449 437 436 419 416 67 34,377 2020 477 466 446 414 393 107 29,481 2021 468 454 432 421 116 30,126 2022 497 489 478 148 33,428 2023 555 551 233 36,822 2024 574 325 34,332 Total $ 4,232 $ 1,216 Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses Accident Year 2015 $ 51 $ 131 $ 180 $ 212 $ 231 $ 243 $ 251 $ 256 $ 259 $ 261 2016 53 129 169 198 219 227 234 235 238 2017 63 151 207 243 265 279 287 293 2018 68 163 229 259 280 298 307 2019 71 169 223 262 291 310 2020 65 147 200 228 246 2021 67 164 222 256 2022 79 192 258 2023 87 209 2024 111 Total $ 2,489 Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented $ 1,743 Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2015 1,757 Other (b) (22) Liability for unallocated claim adjustment expenses for accident years presented 65 Total net liability for unpaid claim and claim adjustment expenses $ 3,543 Net Strengthening (Releases) of Prior Accident Year Reserves Years Ended December 31 Total Accident Year 2015 $ 9 $ (25) $ 2 $ (14) $ (12) $ (10) $ (19) $ (19) $ (10) $ (98) 2016 (21) (9) (14) (16) (11) (24) (23) (15) (133) 2017 (8) (11) (21) 2 (3) (1) (15) (57) 2018 (10) (12) (13) — (11) (5) (51) 2019 (3) (12) (1) (17) (3) (36) 2020 (11) (20) (32) (21) (84) 2021 (14) (22) (11) (47) 2022 (8) (11) (19) 2023 (4) (4) Total net development for the accident years presented above (81) (133) (95) Adjustment for development on a discounted basis (3) (2) (2) Total net development for accident years prior to 2015 (78) (74) (105) Total unallocated claim adjustment expense development 10 6 — Total $ (152) $ (203) $ (202) (a) Data presented for these calendar years is required supplemental information, which is unaudited. (b) Other includes the effect of discounting lifetime claim reserves. The table below presents information about average historical claims duration as of December 31, 2024 and is presented as required supplementary information, which is unaudited. Average Annual Percentage Payout of Ultimate Net Incurred Claim and Allocated Claim Adjustment Expenses in Year: 1 2 3 4 5 6 7 8 9 10 Medical professional liability 3.6 % 16.3 % 21.8 % 16.6 % 12.7 % 8.9 % 5.7 % 3.2 % 1.1 % 1.6 % Other professional liability and management liability 6.5 19.6 19.2 14.7 10.5 6.9 5.6 6.1 2.5 0.6 Surety (a) 17.3 41.0 16.4 8.1 3.9 6.2 (2.3) (0.3) 1.1 — Commercial auto 23.7 22.3 18.4 14.6 10.5 5.1 2.4 0.9 0.5 1.1 General liability 3.4 12.5 15.7 16.8 13.8 9.2 7.1 5.7 3.2 1.2 Workers’ compensation 16.8 23.4 14.2 8.8 5.9 3.8 2.3 1.2 1.0 0.6 (a) Due to the nature of the Surety business, average annual percentage payout of ultimate net incurred claim and allocated claim adjustment expenses has been calculated using only the payouts of mature accident years presented in the loss reserve development tables. 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

Future Policy Benefits Reserves

Future Policy Benefits Reserves	12 Months Ended
	Dec. 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 LFPB which is reflected as Insurance reserves: Future policy benefits on the Consolidated Balance Sheets. 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. Annually in the third quarter, actuarial analysis is performed on policyholder morbidity, persistency, premium rate increase and expense experience. This analysis, combined with judgment, informs the setting of updated cash flow assumptions used to estimate the LFPB. Actuarial analysis includes predictive modeling, actual to expected experience comparisons and trend analysis. Applicable industry research is also considered. The cash flow assumption updates completed in the third quarter of 2024 resulted in a $15 million pretax increase in the LFPB. Included in the assumption updates was a favorable impact from outperformance on premium rate assumptions and an unfavorable impact from higher cost of care inflation. The cash flow assumption updates completed in the third quarter of 2023 resulted in an $8 million pretax increase in the LFPB. Persistency updates were unfavorable due to revisions to lapse rates. Morbidity updates were favorable, driven by claim severity assumption updates, and there was a favorable impact from outperformance on premium rate assumptions. The following table summarizes balances and changes in the LFPB. 2024 2023 2022 (In millions) Present value of future net premiums Balance, January 1 $ 3,710 $ 3,991 $ 4,735 Effect of changes in discount rate (125) (74) (880) Balance, January 1, at original locked in discount rate 3,585 3,917 3,855 Effect of changes in cash flow assumptions (a) 111 28 352 Effect of actual variances from expected experience (a) (41) (126) (49) Adjusted balance, January 1 3,655 3,819 4,158 Interest accrual 183 202 216 Net premiums: earned during period (420) (436) (457) Balance, end of period at original locked in discount rate 3,418 3,585 3,917 Effect of changes in discount rate 7 125 74 Balance, December 31 $ 3,425 $ 3,710 $ 3,991 Present value of future benefits & expenses Balance, January 1 $ 17,669 $ 17,471 $ 22,745 Effect of changes in discount rate (578) (125) (5,942) Balance, January 1, at original locked in discount rate 17,091 17,346 16,803 Effect of changes in cash flow assumptions (a) 126 36 538 Effect of actual variances from expected experience (a) 69 (46) (21) Adjusted balance, January 1 17,286 17,336 17,320 Interest accrual 924 962 979 Benefit & expense payments (1,187) (1,207) (953) Balance, end of period at original locked in discount rate 17,023 17,091 17,346 Effect of changes in discount rate (440) 578 125 Balance, December 31 $ 16,583 $ 17,669 $ 17,471 Net LFPB, December 31 $ 13,158 $ 13,959 $ 13,480 (a) As of December 31, 2024, 2023 and 2022 the re-measurement loss of $(125), $(88) and $(214) presented parenthetically on the Consolidated 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 Consolidated Statement of Operations. Year Ended December 31 2024 2023 2022 (In millions) Earned premiums $ 437 $ 451 $ 473 Interest expense 741 760 763 The following table presents undiscounted expected future benefit and expense payments and undiscounted expected future gross premiums. December 31, 2024 2023 (In millions) Expected future benefit and expense payments $ 31,712 $ 32,851 Expected future gross premiums 5,183 5,414 Discounted expected future gross premiums at the upper-medium grade fixed income instrument yield discount rate were $3.6 billion and $3.8 billion as of December 31, 2024 and 2023 . The weighted average effective duration of the LFPB calculated using the original locked in discount rate was 11 years as of December 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. December 31, 2024 2023 Original locked in discount rate 5.20 % 5.22 % Upper-medium grade fixed income instrument discount rate 5.51 4.94 For the years ended December 31, 2024 and 2023 , immediate charges to net income resulting from adverse development in certain cohorts where the NPR exceeded 100% were $159 million and $164 million. For the years ended December 31, 2024 and 2023

Leases

Leases	12 Months Ended
	Dec. 31, 2024
Leases [Abstract]
Leases	Leases Lease agreements primarily cover office facilities and machinery and equipment and expire at various dates. Leases, predominantly operating leases, are included in Other assets and Other liabilities on the Consolidated Balance Sheets. The lease agreements do not contain significant residual value guarantees, restrictions or covenants. Operating lease right of use assets and lease liabilities are recognized at the lease commencement date based on the present value of lease payments over the lease term. The discount rate used to determine the commencement date present value of lease payments is typically the applicable secured borrowing rate, as most of the leases do not provide an implicit rate. The operating lease right of use asset operating lease liability Total lease expense was $79 million, $87 million and $89 million for the years ended December 31, 2024, 2023 and 2022 which includes operating lease expense of $51 million, $58 million and $60 million, variable lease expense of $23 million, $24 million and $26 million and short-term lease expense of $5 million, $5 million and $3 million. Cash paid for amounts included in operating lease liabilities was $80 million, $60 million and $64 million for year ended December 31, 2024, 2023 and 2022. Operating lease right of use assets obtained in exchange for lease obligations was $73 million, $39 million and $118 million for the years ended December 31, 2024, 2023 and 2022. The table below presents the maturities of lease liabilities: Operating As of December 31, 2024 Leases (In millions) 2025 $ 64 2026 55 2027 53 2028 48 2029 49 Thereafter 291 Total 560 Less: discount 154 Total lease liabilities $ 406 The table below presents the weighted average remaining lease term for operating leases and weighted average discount rate used in calculating the operating lease asset and liability. As of December 31, 2024 Weighted average remaining lease term 10.5 years Weighted average discount rate 3.9 %

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2024
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Loews Corporation and its eligible subsidiaries file a consolidated federal income tax return. Loews Corporation has entered into a separate tax allocation agreement with CNA, a majority-owned subsidiary in which its ownership exceeds 80%. The agreement provides that Loews Corporation will: (i) pay to CNA the amount, if any, by which Loews Corporation’s consolidated federal income tax is reduced by virtue of inclusion of CNA in Loews Corporation’s return or (ii) be paid by CNA an amount, if any, equal to the federal income tax that would have been payable by CNA if it had filed a separate consolidated return. The agreement may be canceled by either of the parties upon thirty days written notice. For 2022 through 2024 , the Company participates in the Internal Revenue Service (“IRS”) Compliance Assurance Process (“CAP”), which is a voluntary program for large corporations. Under CAP, the IRS conducts a real-time audit and works contemporaneously with the Company to resolve any issues prior to the filing of the tax return. For 2023, the Company was selected to participate in the phase of CAP reserved for taxpayers whose risk of noncompliance did not support use of IRS resources. The Company believes that participation in CAP should reduce tax-related uncertainties, if any. Although the outcome of tax audits is always uncertain, the Company believes that any adjustments resulting from audits will not have a material impact on its results of operations, financial position or cash flows. The Company and/or its subsidiaries also file income tax returns in various state, local and foreign jurisdictions. These returns, with few exceptions, are no longer subject to examination by the various taxing authorities before 2020. The current and deferred components of income tax expense are as follows: Year Ended December 31 2024 2023 2022 (In millions) Income tax expense (benefit): Federal: Current $ 320 $ 267 $ 241 Deferred (10) 81 (60) State and city: Current 47 20 25 Deferred (40) 31 15 Foreign 63 52 2 Total $ 380 $ 451 $ 223 The components of U.S. and foreign income before income tax and a reconciliation between the federal income tax expense at statutory rates and the actual income tax expense is as follows: Year Ended December 31 2024 2023 2022 (In millions) Income before income tax: U.S. $ 1,672 $ 1,798 $ 973 Foreign 202 198 141 Total $ 1,874 $ 1,996 $ 1,114 Income tax expense at statutory rate $ 393 $ 419 $ 235 Increase (decrease) in income tax expense resulting from: Exempt investment income (22) (28) (38) Foreign related tax differential (5) 1 (15) Valuation allowance 1 2 1 State taxes 8 48 36 Other 5 9 4 Income tax expense $ 380 $ 451 $ 223 For the year ended December 31, 2024, income tax expense includes a $36 million income tax benefit from an adjustment to deferred state income taxes for a rate reduction effective in 2025 resulting from legislation enacted during the fourth quarter of 2024. As of December 31, 2024, no deferred taxes are required on the undistributed earnings of subsidiaries subject to tax. As of December 31, 2024, 2023 and 2022, there were no unrecognized tax benefits. Accrued interest related to unrecognized tax benefits and tax refund claims is recognized in Income tax expense on the Consolidated Statements of Operations. Penalties are recognized in Income tax expense on the Consolidated Statements of Operations. No interest expense and no penalties were recorded for the years ended December 31, 2024, 2023 and 2022. The following table summarizes deferred tax assets and liabilities: December 31 2024 2023 (In millions) Deferred tax assets: Insurance reserves: Property and casualty claim and claim adjustment expense reserves $ 234 $ 202 Unearned premium reserves 225 213 Policyholder reserves 160 Deferred revenue 85 70 Employee benefits 79 86 Deferred retroactive reinsurance benefit 89 88 Net operating loss carryforwards 35 44 Net unrealized losses 485 416 Other 153 159 Total deferred tax assets 1,385 1,438 Valuation allowance (19) (18) Net deferred tax assets 1,366 1,420 Deferred tax liabilities: Deferred acquisition costs (140) (126) Policyholder reserves (48) Property, plant and equipment (963) (938) Basis differential in investment in subsidiary (481) (502) Other liabilities (245) (198) Total deferred tax liabilities (1,877) (1,764) Net deferred tax liabilities (a) $ (511) $ (344) (a) Includes deferred tax assets reflected in Other assets on the Consolidated Balance Sheets at December 31, 2024 and 2023 $ 39 $ 54 As of December 31, 2024, a U.S. foreign tax credit carryforward of $8 million expires in 2034. Net operating loss carryforwards in foreign tax jurisdictions of $138 million and tax credit carryforwards in such jurisdictions of $10 million have no expiration. Although realization of deferred tax assets is not assured, management believes it is more likely than not that the recognized deferred tax assets will be realized through recoupment of ordinary and capital taxes paid in prior carryback years and through future earnings, reversal of existing temporary differences and available tax planning strategies. As of December 31, 2024, a valuation allowance of $19 million was recorded related to state net operating losses and disallowed business interest expense from joint ventures.

Debt

Debt	12 Months Ended
	Dec. 31, 2024
Debt Disclosure [Abstract]
Debt	Debt December 31 2024 2023 (In millions) Loews Corporation (Parent Company): Senior: 3.8% notes due 2026 (effective interest rate of 3.9%) (authorized, $500) $ 500 $ 500 3.2% notes due 2030 (effective interest rate of 3.3%) (authorized, $500) 500 500 6.0% notes due 2035 (effective interest rate of 6.2%) (authorized, $300) 300 300 4.1% notes due 2043 (effective interest rate of 4.3%) (authorized, $500) 500 500 CNA Financial: Senior: 4.0% notes due 2024 (effective interest rate of 4.0%) (authorized, $550) 550 4.5% notes due 2026 (effective interest rate of 4.5%) (authorized, $500) 500 500 3.5% notes due 2027 (effective interest rate of 3.5%) (authorized, $500) 500 500 3.9% notes due 2029 (effective interest rate of 3.9%) (authorized, $500) 500 500 2.1% notes due 2030 (effective interest rate of 2.1%) (authorized, $500) 500 500 5.5% notes due 2033 (effective interest rate of 5.7%) (authorized, $500) 500 500 5.1% notes due 2034 (effective interest rate of 5.3%) (authorized, $500) 500 Boardwalk Pipelines: Senior: Variable rate revolving credit facility due 2028 (effective interest rate of 6.7%) 25 5.0% notes due 2024 (effective interest rate of 5.2%) (authorized, $600) 600 6.0% notes due 2026 (effective interest rate of 6.2%) (authorized, $550) 550 550 4.5% notes due 2027 (effective interest rate of 4.6%) (authorized, $500) 500 500 7.3% debentures due 2027 (effective interest rate of 8.1%) (authorized, $100) 100 100 4.8% notes due 2029 (effective interest rate of 4.9%) (authorized, $500) 500 500 3.4% notes due 2031 (effective interest rate of 3.5%) (authorized, $500) 500 500 3.6% notes due 2032 (effective interest rate of 3.7%) (authorized, $500) 500 500 5.6% notes due 2034 (effective interest rate of 5.8%) (authorized, $600) 600 Finance lease obligation 4 5 Loews Hotels & Co: Senior debt, principally mortgages (effective interest rates approximate 6.7% and 6.8%) 1,011 933 9,065 9,063 Less unamortized discount and issuance costs 70 60 Less intercompany eliminations 51 Debt $ 8,944 $ 9,003 December 31, 2024 Principal Unamortized Discount and Issuance Costs Net Short Term Debt Long Term Debt (In millions) Loews Corporation $ 1,800 $ 15 $ 1,785 $ 1,785 CNA Financial 3,000 27 2,973 2,973 Boardwalk Pipelines 3,254 19 3,235 $ 1 3,234 Loews Hotels & Co 1,011 9 1,002 4 998 Less intercompany eliminations 51 51 51 Total $ 9,014 $ 70 $ 8,944 $ 5 $ 8,939 At December 31, 2024, the aggregate long-term debt maturing in each of the next five years is approximately as follows: $5 million in 2025, $1.9 billion in 2026, $1.1 billion in 2027, $56 million in 2028, $1.2 billion in 2029 and $4.8 billion thereafter. Long-term debt is generally redeemable in whole or in part at the greater of the principal amount or the net present value of remaining scheduled payments discounted at the specified treasury rate plus a margin. CNA is a member of the Federal Home Loan Bank of Chicago (“FHLBC”). FHLBC membership provides participants with access to additional sources of liquidity through various programs and services. As a requirement of membership in the FHLBC, CNA held $5 million of FHLBC stock as of December 31, 2024, giving it access to approximately $108 million of additional liquidity. As of December 31, 2024 and 2023, CNA had no outstanding borrowings from the FHLBC. In 2023, CNA amended and restated its existing credit agreement with a syndicate of banks. The agreement provides a five-year $250 million senior unsecured revolving credit facility which is intended to be used for general corporate purposes. At CNA’s election, the commitments under the amended and restated credit agreement may be increased from time to time up to an additional aggregate amount of $100 million, and two one-year extensions are available prior to any anniversary of the closing date, each subject to applicable consents. As of December 31, 2024, CNA had no outstanding borrowings under the credit agreement and was in compliance with all covenants. In 2024, CNA issued $500 million of 5.1% senior notes due February 15, 2034 and repaid at maturity the $550 million outstanding aggregate principal amount of its 4.0% senior notes. Boardwalk Pipelines has a revolving credit facility with available borrowing capacity of $1 billion through May 27, 2027 and a borrowing capacity of $912 million from May 28, 2027 to May 26, 2028. Interest rates are based on the term Secured Overnight Financing Rate (“SOFR”). As of December 31, 2024, Boardwalk Pipelines had no outstanding borrowings under its revolving credit facility. As of December 31, 2024, Boardwalk Pipelines was in compliance with its covenants under the credit agreement. 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 . In December of 2024, Boardwalk Pipelines retired at maturity the $600 million outstanding aggregate principal amount of its 5.0% senior notes. Loews Hotels & Co, through its subsidiaries, has debt with various lenders which is generally secured by specific hotel properties. These loans include a range of financial and operational covenants. As of December 31, 2024, Loews Hotels & Co’s subsidiaries were in compliance with their debt covenants.

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2024
Equity [Abstract]
Shareholders' Equity	Shareholders’ Equity Accumulated other comprehensive income (loss) The tables below present the changes in AOCI by component for the years ended December 31, 2022, 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, 2022, as reported $ (2) $ 930 $ — $ (6) $ (636) $ (100) $ 186 Cumulative effect adjustments from changes in accounting standards (Note 1), after tax of $0, $(617), $1,063, $0, $0 and $0 2,079 (3,585) (1,506) Balance, January 1, 2022, as adjusted (2) 3,009 (3,585) (6) (636) (100) (1,320) Other comprehensive income (loss) before reclassifications, after tax of $0, $1,643, $(1,052), $(7), $1 and $0 (6,223) 3,959 20 (3) (111) (2,358) Reclassification of (gains) losses from accumulated other comprehensive loss, after tax of $1, $(21), $0, $0, $(5) and $0 (5) 126 18 139 Other comprehensive income (loss) (5) (6,097) 3,959 20 15 (111) (2,219) Amounts attributable to noncontrolling interests 619 (410) (1) 11 219 Balance, December 31, 2022 $ (7) $ (2,469) $ (36) $ 14 $ (622) $ (200) $ (3,320) Other comprehensive income (loss) before reclassifications, after tax of $6, $(290), $85, $2, $(10) and $0 (24) 1,072 (318) (5) 41 60 826 Reclassification of (gains) losses from accumulated other comprehensive loss, after tax of $(5), $(14), $0, $0, $(18) and $0 19 53 63 135 Other comprehensive income (loss) (5) 1,125 (318) (5) 104 60 961 Amounts attributable to noncontrolling interests (93) 26 (5) (5) (77) Purchase of CNA shares (46) (1) (10) (4) (61) Balance, December 31, 2023 $ (12) $ (1,483) $ (329) $ 9 $ (533) $ (149) $ (2,497) Other comprehensive income (loss) before reclassifications, after tax of $9, $81, $(189), $(1), $(6) and $1 (34) (309) 712 22 (102) 289 Reclassification of losses from accumulated other comprehensive loss, after tax of $(9), $(13), $0, $0, $(86) and $0 33 47 318 398 Other comprehensive income (loss) (1) (262) 712 — 340 (102) 687 Amounts attributable to noncontrolling interests 22 (59) (28) 8 (57) Other 3 (3) — Balance, December 31, 2024 $ (13) $ (1,720) $ 324 $ 9 $ (224) $ (243) $ (1,867) 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 Common Stock Dividends Loews Corporation declared and paid dividends of $0.25 per share in the aggregate on its common stock in each of 2024, 2023 and 2022. There are no restrictions on Loews Corporation’s retained earnings or net income with regard to payment of dividends. However, as a holding company, Loews Corporation relies upon invested cash balances and distributions from its subsidiaries to generate the funds necessary to declare and pay any dividends to holders of its common stock. The ability of Loews Corporation’s subsidiaries to pay dividends is subject to, among other things, the availability of sufficient earnings and funds in such subsidiaries, compliance with covenants in their respective credit agreements and applicable state laws, including in the case of the insurance subsidiaries of CNA, laws and rules governing the payment of dividends by regulated insurance companies. See Note 15 for a discussion of the regulatory restrictions on CNA’s availability to pay dividends. Stock Purchases Loews Corporation repurchased 7.7 million, 14.0 million and 12.7 million shares of its common stock at aggregate costs of $0.6 billion, $0.9 billion and $0.7 billion during the years ended December 31, 2024, 2023 and 2022. On December 31, 2024, 7.6 million shares of Loews Corporation common stock were retired. Upon retirement, treasury stock was eliminated through a reduction to common stock, APIC and retained earnings. Loews Corporation purchased 4.5 million shares of CNA’s common stock at an aggregate cost of $178 million in 2023.

Revenue from Contracts with Cus

Revenue from Contracts with Customers	12 Months Ended
	Dec. 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 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 20: Year Ended December 31 2024 2023 2022 (In millions) Non-insurance warranty – CNA Financial $ 1,609 $ 1,624 $ 1,574 Transportation and storage of natural gas and NGLs and ethane supply and transportation services – Boardwalk Pipelines $ 1,987 $ 1,582 $ 1,398 Lodging and related services – Loews Hotels & Co 906 778 689 Total revenues from contracts with customers 2,893 2,360 2,087 Other revenues 98 95 113 Operating revenues and other $ 2,991 $ 2,455 $ 2,200 Receivables from contracts with customers – As of December 31, 2024 and 2023, receivables from contracts with customers were approximately $240 million and $228 million and are included within Receivables on the Consolidated Balance Sheets. Deferred revenue – As of December 31, 2024 and 2023, deferred revenue resulting from contracts with customers was approximately $4.6 billion and $4.8 billion and is reported as Deferred non-insurance warranty revenue and within Other liabilities on the Consolidated Balance Sheets. The decrease in the deferred revenue balance for the year ended December 31, 2024 was primarily driven by recognized revenue from prior periods outpacing new growth in CNA’s non-insurance warranty business. Approximately $1.5 billion and $1.4 billion of revenues recognized during each of the years ended December 31, 2024 and 2023 were included in deferred revenue as of January 1, 2024 and 2023. Contract costs – As of December 31, 2024 and 2023, the Company had approximately $3.5 billion and $3.7 billion of costs to obtain contracts with customers related to CNA for amounts paid to dealers and other agents to obtain non-insurance warranty contracts, which are reported as Deferred non-insurance warranty acquisition expenses on the Consolidated Balance Sheets. For the years ended December 31, 2024 and 2023, amortization expense of $1.2 billion is reported as Non-insurance warranty expense on the Consolidated Statement of Operations. There were no adjustments to deferred costs recorded for the years ended December 31, 2024 and 2023. Performance obligations – As of December 31, 2024, approximately $18.6 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 NGLs and certain ethane supply contracts at Boardwalk Pipelines and non-insurance warranty revenue at CNA. Approximately $2.9 billion will be recognized during 2025, $2.4 billion in 2026 and the remainder in following years. The actual timing of recognition may vary due to factors outside of the Company’s control.

Statutory Accounting Practices

Statutory Accounting Practices	12 Months Ended
	Dec. 31, 2024
Statutory Accounting Practices [Abstract]
Statutory Accounting Practices	Statutory Accounting Practices CNA’s insurance subsidiaries are domiciled in various jurisdictions. These subsidiaries prepare statutory financial statements in accordance with accounting practices prescribed or permitted by the respective jurisdictions’ insurance regulators. Domestic prescribed statutory accounting practices are set forth in a variety of publications of the National Association of Insurance Commissioners (“NAIC”) as well as state laws, regulations and general administrative rules. These statutory accounting principles vary in certain respects from GAAP. In converting from statutory accounting principles to GAAP, the more significant adjustments include deferral of policy acquisition costs and the inclusion of net unrealized holding gains or losses in shareholders’ equity relating to certain fixed maturity securities. CNA has a prescribed practice as it relates to the accounting under Statement of Statutory Accounting Principles No. 62R, Property and Casualty Reinsurance , paragraphs 87 and 88 in conjunction with the 2010 loss portfolio transfer with NICO which is further discussed in Note 8. The prescribed practice allows CNA to aggregate all third party A&EP reinsurance balances administered by NICO in Schedule F and to utilize the LPT as collateral for the underlying third-party reinsurance balances for purposes of calculating the statutory reinsurance penalty. This prescribed practice increased statutory capital and surplus by $55 million and $92 million at December 31, 2024 and 2023. The payment of dividends by CNA’s insurance subsidiaries without prior approval of the insurance department of each subsidiary’s domiciliary jurisdiction is generally limited by formula. Dividends in excess of these amounts are subject to prior approval by the respective insurance regulator. Dividends from CCC are subject to the insurance holding company laws of the State of Illinois, the domiciliary state of CCC. Under these laws, ordinary dividends, or dividends that do not require prior approval by the Illinois Department of Insurance (the “Department”) are determined based on the greater of the prior year’s statutory net income or 10% of statutory surplus as of the end of the prior year, as well as the timing and amount of dividends paid in the preceding 12 months. Additionally, ordinary dividends may only be paid from earned surplus, which is calculated by removing unrealized gains from unassigned surplus. As of December 31, 2024, CCC was in a positive earned surplus position. The maximum allowable dividend CCC could pay during 2025 that would not be subject to the Department’s prior approval is $1.1 billion, less dividends paid during the preceding 12 months measured at that point in time. CCC paid dividends of $995 million in 2024 . The actual level of dividends paid in any year is determined after an assessment of available dividend capacity, holding company liquidity and cash needs as well as the impact the dividends will have on the statutory surplus of the applicable insurance company. Combined statutory capital and surplus and statutory net income for the Combined Continental Casualty Companies are presented in the table below, determined in accordance with accounting practices prescribed or permitted by insurance and/or other regulatory authorities. Statutory Capital and Surplus Statutory Net Income December 31 Year Ended December 31 2024 (a) 2023 2024(a)(b) 2023 2022 (In millions) Combined Continental Casualty Companies $11,165 $10,946 $713 $1,172 $1,072 (a) Information derived from the statutory-basis financial statements to be filed with insurance regulators. (b) Includes a $293 million after-tax loss from pension settlement transactions. Pension settlement transactions are further discussed in Note 16. CNA’s domestic insurance subsidiaries are subject to risk-based capital (“RBC”) requirements. RBC is a method developed by the NAIC to determine the minimum amount of statutory capital appropriate for an insurance company to support its overall business operations in consideration of its size and risk profile. The formula for determining the amount of RBC specifies various factors, weighted based on the perceived degree of risk, which are applied to certain financial balances and financial activity. The adequacy of a company’s actual capital is evaluated by a comparison to the RBC results, as determined by the formula. Companies below minimum RBC requirements are classified within certain levels, each of which requires specified corrective action. The statutory capital and surplus presented above for CCC as of December 31, 2024 and 2023 was significantly above the level at which any RBC regulatory action would occur. The statutory capital and surplus of CNA’s foreign insurance subsidiaries, which is not significant to the overall statutory capital and surplus, also met or exceeded their respective regulatory and other capital requirements.

Benefit Plans

Benefit Plans	12 Months Ended
	Dec. 31, 2024
Retirement Benefits [Abstract]
Benefit Plans	Benefit Plans Pension Plans – Several non-contributory defined benefit plans are maintained for eligible employees. For benefits in certain plans, the accrued pension balance is credited with interest based on specified annual interest rates (which are established annually for all participants). The benefits for another plan which covers salaried employees are based on formulas which include, among others, years of service and average pay. The funding policy is to make contributions in accordance with applicable governmental regulatory requirements. Other Postretirement Benefit Plans – Several postretirement benefit plans cover eligible employees and retirees. Participants generally become eligible after reaching age 55 with required years of service. Actual requirements for coverage vary by plan. Benefits for retirees who were covered by bargaining agreements vary by each unit and contract. Benefits for certain retirees are in the form of a health care account. Benefits for retirees reaching age 65 are generally integrated with Medicare. Other retirees, based on plan provisions, must use Medicare as their primary coverage, with a portion of the unpaid amount being reimbursed by the employer; or are reimbursed for the Medicare Part B premium or have no employer coverage. The benefits provided are basically health and, for certain retirees, life insurance type benefits. Certain of these benefit plans are funded and postretirement benefits are accrued during the active service of those employees who would become eligible for such benefits when they retire. December 31 is used as the measurement date for the plans. Weighted average assumptions used to determine benefit obligations: Pension Benefits Other Postretirement Benefits December 31 2024 2023 2022 2024 2023 2022 Discount rate 5.4 % 5.0 % 5.2 % 5.5 % 5.1 % 5.4 % Interest crediting rate 4.3 % 4.5 % 3.4 % Rate of compensation increase 0.0% to 4.5% 0.0% to 3.5% 0.0% to 4.5% Weighted average assumptions used to determine net periodic benefit cost: Pension Benefits Other Postretirement Benefits Year Ended December 31 2024 2023 2022 2024 2023 2022 Discount rate 5.0 % 5.2 % 3.4 % 5.1 % 5.4 % 2.6 % Expected long-term rate of return on plan assets 6.1 % 6.2 % 6.3 % 3.3 % 3.0 % 2.0 % Interest crediting rate 4.5 % 3.5 % 3.0 % Rate of compensation increase 0.0% to 3.5% 0.0% to 3.8% 0.0% to 3.0% In determining the discount rate assumption, current market and liability information is utilized, including a discounted cash flow analysis of the pension and postretirement obligations. In particular, the basis for the discount rate selection was the yield on indices of highly rated fixed income debt securities with durations comparable to that of plan liabilities. The yield curve was applied to expected future retirement plan payments to adjust the discount rate to reflect the cash flow characteristics of the plans. The yield curves and indices evaluated in the selection of the discount rate are comprised of high quality corporate bonds that are rated AA by an accepted rating agency. The expected long-term rate of return for plan assets is determined based on widely-accepted capital market principles, long-term return analysis for global fixed income and equity markets as well as the active total return oriented portfolio management style. Long-term trends are evaluated relative to market factors such as inflation, interest rates and fiscal and monetary policies, in order to assess the capital market assumptions as applied to the plan. Consideration of diversification needs and rebalancing is maintained. Assumed health care cost trend rates: December 31 2024 2023 2022 Health care cost trend rate assumed for next year 4.0% to 8.0% 4.0% to 7.0% 4.0% to 6.5% Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) 4.0% to 5.5% 4.0% to 5.5% 4.0% to 5.5% Year that the rate reaches the ultimate trend rate 2025-2029 2024-2028 2023-2026 During 2023, the Parent Company completed the termination of a non-contributory defined benefit plan. In total, the plan paid $66 million for the purchase of group annuity contracts from a third party insurance company to settle its obligations to retirees and certain participants and $34 million in lump sum payments to settle its obligations to certain other participants. The Company recorded a settlement expense of $47 million ($37 million after-tax) to recognize unrealized losses which were previously included in AOCI. In 2024 , a subsidiary of CNA, as a sponsor of the CNA Employee Retirement Plan Trust (the “Plan”), paid $1 billion to purchase a nonparticipating single premium group annuity contract with Metropolitan Life Insurance Company (the “Insurer”) that transferred to the Insurer $1 billion of the Plan’s defined benefit pension obligations. The group annuity contract covers approximately 7,600 Plan participants and beneficiaries (the “Transferred Participants”), representing approximately 60% of the Plan’s obligations. Under the group annuity contract, the Insurer has made an irrevocable commitment, and will be solely responsible, to pay the pension benefits of each Transferred Participant that are due on and after January 1, 2025. The purchase of the group annuity contract was funded directly by assets of the Plan and required no cash or asset contributions from CNA. As a result of the transaction, CNA recognized a pretax pension settlement charge of $367 million ($265 million after tax and noncontrolling interest). This charge is largely driven by the accelerated recognition of the actuarial pension loss from Accumulated other comprehensive income into Net income, which does not impact Shareholders’ equity. In 2023, the CNA Retirement Plan paid $80 million to settle its obligation to certain retirees through the purchase of a group annuity contract from a third party insurance company, which reduced the plan's projected benefit obligation by $86 million. Net periodic (benefit) cost components: Pension Benefits Other Postretirement Benefits Year Ended December 31 2024 2023 2022 2024 2023 2022 (In millions) Service cost $ 2 $ 2 $ 2 Interest cost 96 110 76 $ 2 $ 2 $ 1 Expected return on plan assets (119) (125) (165) (3) (3) (2) Amortization of unrecognized net loss 29 35 32 1 1 Settlements 372 48 5 Net periodic (benefit) cost $ 380 $ 70 $ (50) $ — $ — $ (1) The following provides a reconciliation of benefit obligations and plan assets: Pension Benefits Other Postretirement Benefits 2024 2023 2024 2023 (In millions) Change in benefit obligation: Benefit obligation at January 1 $ 1,991 $ 2,220 $ 34 $ 33 Service cost 2 2 Interest cost 96 110 2 2 Plan participants’ contributions 2 3 Actuarial (gain) loss (29) 31 6 Benefits paid from plan assets (149) (181) (7) (10) Settlements (1,052) (194) Foreign exchange (2) 3 Benefit obligation at December 31 $ 857 $ 1,991 $ 31 $ 34 Change in plan assets: Fair value of plan assets at January 1 $ 2,074 $ 2,212 $ 83 $ 81 Actual return on plan assets 120 206 3 5 Company contributions 13 22 2 4 Plan participants' contributions 2 3 Benefits paid from plan assets (149) (181) (7) (10) Settlements (1,052) (188) Foreign exchange (2) 3 Fair value of plan assets at December 31 $ 1,004 $ 2,074 $ 83 $ 83 Funded status $ 147 $ 83 $ 52 $ 49 Pension Benefits Other Postretirement Benefits 2024 2023 2024 2023 (In millions) Amounts recognized in the Consolidated Balance Sheets consist of: Other assets $ 283 $ 229 $ 61 $ 59 Other liabilities (136) (146) (9) (10) Net amount recognized $ 147 $ 83 $ 52 $ 49 Amounts recognized in Accumulated other comprehensive income (loss), not yet recognized in net periodic (benefit) cost: Prior service credit $ 1 $ 1 Net actuarial loss 241 672 $ 2 $ 3 Net amount recognized $ 242 $ 673 $ 2 $ 3 Information for plans with projected and accumulated benefit obligations in excess of plan assets: Projected benefit obligation $ 136 $ 229 Accumulated benefit obligation 136 143 $ 9 $ 11 Fair value of plan assets — 83 The accumulated benefit obligation for all defined benefit pension plans was $854 million and $2.0 billion at December 31, 2024 and 2023. Changes for the year ended December 31, 2024 include the impact of the pension settlement transaction discussed above and an actuarial gain of $29 million primarily driven by changes in the discount rate used to determine the benefit obligations. A total return approach is employed whereby a mix of equity, limited partnerships and fixed maturity securities are used to maximize the long-term return of plan assets for a prudent level of risk and to manage cash flows according to plan requirements. The target allocation of plan assets is 0% to 40% invested in equity securities and limited partnerships, with the remainder primarily invested in fixed maturity securities. The intent of this strategy is to minimize expenses by generating investment returns that exceed the growth of the plan liabilities over the long run. Risk tolerance is established after careful consideration of the plan liabilities, plan funded status and corporate financial conditions. The investment portfolios contain a diversified blend of fixed maturity, equity and short-term securities. Alternative investments, including limited partnerships, are used to enhance risk adjusted long-term returns while improving portfolio diversification. At December 31, 2024, $92 million is committed to fund future capital calls from various third party limited partnership investments in exchange for an ownership interest in the related partnerships. Investment risk is monitored through annual liability measurements, periodic asset/liability studies and quarterly investment portfolio reviews. The table below presents the estimated future minimum benefit payments at December 31, 2024. Expected future benefit payments Pension Benefits Other Postretirement Benefits (In millions) 2025 $ 86 $ 3 2026 78 3 2027 81 3 2028 79 3 2029 72 2 2030 – 2034 310 10 In 2025, it is expected that contributions of approximately $16 million will be made to pension plans and $1 million to postretirement health care and life insurance benefit plans. Pension plan assets measured at fair value on a recurring basis are summarized below. December 31, 2024 Level 1 Level 2 Level 3 Total (In millions) Plan assets at fair value: Fixed maturity securities: Corporate and other bonds $ 408 $ 5 $ 413 States, municipalities and political subdivisions 6 6 Asset-backed 113 8 121 Total fixed maturities $ — 527 13 540 Equity securities 44 15 59 Short-term investments 59 59 Fixed income mutual funds 40 40 Other assets 2 2 Total plan assets at fair value $ 143 $ 544 $ 13 $ 700 Plan assets at net asset value: (a) L imited partnerships 304 Total plan assets $ 143 $ 544 $ 13 $ 1,004 December 31, 2023 Level 1 Level 2 Level 3 Total (In millions) Plan assets at fair value: Fixed maturity securities: Corporate and other bonds $ 10 $ 1,041 $ 6 $ 1,057 States, municipalities and political subdivisions 55 55 Asset-backed 233 8 241 Total fixed maturities 10 1,329 14 1,353 Equity securities 154 6 160 Short-term investments 114 114 Fixed income mutual funds 26 26 Other assets 11 11 Total plan assets at fair value $ 304 $ 1,346 $ 14 $ 1,664 Plan assets at net asset value: (a) Equity securities 25 L imited partnerships 385 Total plan assets $ 304 $ 1,346 $ 14 $ 2,074 (a) Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table for these investments are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the statement of financial position. The limited partnership investments held within the plans are recorded at fair value, which represents the plans’ shares of the net asset value of each partnership, as determined by the general partner. Limited partnerships comprising more than 99% and 93% of the carrying value as of December 31, 2024 and 2023 were invested in private debt and equity. Limited partnerships comprising less than 1% and 7% of the carrying value as of December 31, 2024 and 2023 employ hedge fund strategies. Private debt and equity funds cover a broad range of investment strategies including buyout, private credit, growth capital and distressed investing. Hedge fund strategies include both long and short positions in fixed income, equity and derivative instruments. Within hedge fund strategies, approximately 100% were equity related, none pursued a multi-strategy approach and none were focused on distressed investments at December 31, 2024. For a discussion of the valuation methodologies used to measure fixed maturity securities, equities and short-term investments, see Note 4. Other postretirement benefits plan assets measured at fair value on a recurring basis are summarized below. December 31, 2024 Level 1 Level 2 Level 3 Total (In millions) Fixed maturity securities: Corporate and other bonds $ 48 $ 48 States, municipalities and political subdivisions 35 35 Asset-backed 1 1 Total fixed maturities $ — 84 $ — 84 Short-term investments 2 2 Fixed income mutual funds 15 15 Total assets $ 17 $ 84 $ — $ 101 Other liabilities $ 18 $ 18 December 31, 2023 Level 1 Level 2 Level 3 Total (In millions) Fixed maturity securities: Corporate and other bonds $ 67 $ 67 States, municipalities and political subdivisions 39 39 Asset-backed 1 1 Total fixed maturities $ — 107 $ — 107 Short-term investments 13 13 Fixed income mutual funds 2 2 Total $ 15 $ 107 $ — $ 122 Other liabilities $ 39 $ 39 There were no Level 3 assets at December 31, 2024 and 2023. Savings Plans – Several contributory savings plans are maintained which allow employees to make regular contributions based upon a percentage of their salaries. Matching contributions are made up to specified percentages of employees’ contributions. In addition, in certain plans, eligible employees also receive a contribution of a percentage of their annual eligible compensation. Employer contributions to these plans amounted to $110 million, $103 million and $90 million for the years ended December 31, 2024, 2023 and 2022. Stock-based Compensation – In 2016, shareholders approved the Loews Corporation 2016 Incentive Compensation Plan (the “2016 Loews Plan”) which replaced a previously existing equity plan. The aggregate number of shares of Loews Corporation common stock authorized under the 2016 Loews Plan is 6,000,000 shares, plus up to 3,000,000 shares that may be forfeited under the prior plan. The maximum number of shares of Loews Corporation common stock with respect to which awards may be granted to any individual in any calendar year is 500,000 shares. In accordance with the 2016 Loews Plan and the prior equity plan, Loews Corporation stock-based compensation consists of the following: SARs: Stock appreciation rights (“SARs”) were granted under the prior equity plan. The exercise price per share may not be less than the fair market value of the common stock on the date of grant. Generally, SARs vested ratably over a four-year period and expire in ten years. Time-based Restricted Stock Units: Time-based restricted stock units (“RSUs”) are granted under the 2016 Loews Plan and represent the right to receive one share of Loews Corporation common stock for each vested RSU. Generally, RSUs vest 50% on the second anniversary of the grant date and 50% on the third anniversary of the grant date. Performance-based Restricted Stock Units: Performance-based RSUs (“PSUs”) are granted under the 2016 Loews Plan and represent the right to receive one share of Loews Corporation common stock for each vested PSU, subject to the achievement of specified performance goals by the Company. Generally, performance-based RSUs vest, if performance goals are satisfied, 50% on the second anniversary of the grant date and 50% on the third anniversary of the grant date. In 2024, Loews Corporation granted an aggregate of 160,895 RSUs and PSUs at a weighted average grant-date fair value of $73.38 per unit. No RSUs were forfeited during the year. 192,000 SARs were outstanding at December 31, 2024 with a weighted average exercise price of $38.59. The Company recognized compensation expense in connection with stock-based compensation that decreased net income by $39 million, $36 million and $34 million for the years ended December 31, 2024, 2023 and 2022. CNA also maintains their own stock-based compensation plan. Such amounts include Loews Corporation’s share of expense related to this plan.

Reinsurance

Reinsurance	12 Months Ended
	Dec. 31, 2024
Reinsurance Disclosures [Abstract]
Reinsurance	Reinsurance CNA cedes insurance to reinsurers to limit its maximum loss, provide greater diversification of risk, minimize exposures on larger risks and to exit certain lines of business. The ceding of insurance does not discharge the primary liability of CNA. A credit exposure exists with respect to reinsurance ceded to the extent that any reinsurer is unable to meet its obligations. A collectability exposure also exists to the extent that the reinsurer disputes the liabilities assumed under reinsurance agreements. Property and casualty reinsurance coverages are tailored to the specific risk characteristics of each product line and CNA’s retained amount varies by type of coverage. Reinsurance contracts are purchased to protect specific lines of business such as property and workers’ compensation. Corporate catastrophe reinsurance is also purchased for property and workers’ compensation exposure. CNA also utilizes facultative reinsurance in certain lines. In addition, CNA assumes reinsurance, primarily through Hardy and as a member of various reinsurance pools and associations. The following table presents the amounts receivable from reinsurers: December 31 2024 2023 (In millions) Reinsurance receivables related to insurance reserves: Ceded claim and claim adjustment expenses $ 5,713 $ 5,141 Reinsurance receivables related to paid losses 359 293 Reinsurance receivables 6,072 5,434 Less allowance for doubtful accounts 21 22 Reinsurance receivables, net of allowance for doubtful accounts $ 6,051 $ 5,412 CNA has established an allowance for doubtful accounts on voluntary reinsurance receivables which relates to both amounts already billed on ceded paid losses as well as ceded reserves that will be billed when losses are paid in the future. The following table summarizes the outstanding amount of voluntary reinsurance receivables, gross of any collateral arrangements, by financial strength rating: As of December 31, 2024 (In millions) A- to A++ $ 4,585 B- to B++ 892 Insolvent 14 Total voluntary reinsurance outstanding balance (a) $ 5,491 (a) Expected credit losses for legacy A&EP receivables are ceded to NICO and the reinsurance limit on the LPT has not been exhausted, therefore no allowance is recorded for these receivables and they are excluded from the table above. See Note 8 for more information on the LPT. Also excluded are receivables from involuntary pools. CNA attempts to mitigate its credit risk related to reinsurance by entering into reinsurance arrangements with reinsurers that have credit ratings above certain levels and by obtaining collateral. On a limited basis, CNA may enter into reinsurance agreements with reinsurers that are not rated, primarily captive reinsurers. Receivables from captive reinsurers are backed by collateral arrangements and comprise the majority of the voluntary reinsurance receivables within the B- to B++ rating distribution in the table above. The primary methods of obtaining collateral are through reinsurance trusts, letters of credit and funds withheld balances. Such collateral, limited by the balance of open recoverables, was approximately $3.4 billion and $3.6 billion at December 31, 2024 and 2023. CNA’s largest recoverables from a single reinsurer, including ceded unearned premium reserves as of December 31, 2024 were approximately $1.8 billion from subsidiaries of the Berkshire Hathaway Insurance Group, $559 million from Cavello Bay Reinsurance Limited and $371 million from the Swiss Reinsurance Group. These amounts are substantially collateralized or otherwise secured. The recoverable from subsidiaries of the Berkshire Hathaway Insurance Group includes amounts related to third party reinsurance for which NICO has assumed the credit risk under the terms of the loss portfolio transfer as discussed in Note 8. The effects of reinsurance on earned premiums are presented in the following table: Assumed/ Direct Assumed Ceded Net Net % (In millions) Year Ended December 31, 2024 Property and casualty $ 14,629 $ 252 $ 5,107 $ 9,774 2.6 % Long-term care 396 41 437 9.4 Earned premiums $ 15,025 $ 293 $ 5,107 $ 10,211 2.9 % Year Ended December 31, 2023 Property and casualty $ 13,908 $ 223 $ 5,102 $ 9,029 2.5 % Long-term care 407 44 451 9.8 Earned premiums $ 14,315 $ 267 $ 5,102 $ 9,480 2.8 % Year Ended December 31, 2022 Property and casualty $ 13,097 $ 231 $ 5,134 $ 8,194 2.8 % Long-term care 427 46 473 9.7 Earned premiums $ 13,524 $ 277 $ 5,134 $ 8,667 3.2 % Included in the direct and ceded earned premiums for the years ended December 31, 2024, 2023 and 2022 are $2.7 billion, $2.9 billion and $3.3 billion related to property business that is 100% reinsured under a significant third party captive program. The third party captives that participate in this program are affiliated with the non-insurance company policyholders, therefore this program provides a means for the policyholders to self-insure this property risk. CNA receives and retains a ceding commission. Insurance claims and policyholders’ benefits reported on the Consolidated Statements of Operations are net of estimated reinsurance recoveries of $3.5 billion, $2.8 billion and $2.6 billion for the years ended December 31, 2024, 2023 and 2022, including $1.7 billion, $1.5 billion and $1.8 billion related to the significant third party captive program discussed above. Long-term care premiums are from long-duration contracts; property and casualty premiums are from short-duration contracts.

Legal Proceedings

Legal Proceedings	12 Months Ended
	Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Legal Proceedings	Legal Proceedings Loews Hotels & Co On February 20, 2024, Jeanette Portillo filed a putative class action against Loews Hotels Holdings Corporation and other defendants in the United States District Court for the Western District of Washington. On March 1, 2024. Ryan Segal filed a putative class action against Loews Hotels Holdings Corporation and other defendants in the United States District Court for the Northern District of Illinois. Both suits assert antitrust claims against defendants under the Sherman Act, 15 U.S.C. § 1, and allege that certain hotel chains, including Loews Hotels, engaged in a conspiracy to fix higher prices for hotel rooms. Defendants jointly filed motions to dismiss the complaints in Portillo and Segal on May 17, 2024 and June 24, 2024, respectively. Defendants await decisions in both cases. The parties have agreed to stay discovery in both cases pending the courts’ rulings on these motions. Boardwalk Pipelines 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. In September 2024, the Trial Court ruled in favor of the Defendants on all of the remanded issues. On October 21, 2024, the Plaintiffs appealed the Trial Court’s ruling on the remanded issues to the Supreme Court. Briefing on the appeal is ongoing and is expected to be completed in March 2025.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 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 December 31, 2024, the potential amount of future payments CNA could be required to pay under these guarantees was approximately $1.4 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	12 Months Ended
	Dec. 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 comprised of Loews Corporation, excluding its consolidated subsidiaries, and includes the equity method of accounting for Altium Packaging. Each of the consolidated 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. CNA’s business is the sale of property and casualty insurance products and services, including surety, primarily through a network of independent agents, brokers and managing general underwriters. CNA’s operations also include its long-term care business that is in run-off, certain corporate expenses, including interest on CNA’s corporate debt, and the results of certain property and casualty businesses in run-off, including CNA Re, A&EP, a legacy portfolio of EWC policies and certain legacy mass tort reserves. Boardwalk Pipelines operates in the midstream portion of the natural gas and NGLs industry, providing transportation and storage for those commodities. It also provides ethane supply and transportation services for industrial customers in Louisiana and Texas. Boardwalk Pipelines owns approximately 14,315 miles of natural gas and NGL pipelines and underground storage caverns. Boardwalk Pipelines’ natural gas pipeline systems are located in the Gulf Coast region, Oklahoma, Arkansas, Tennessee, Kentucky, Illinois, Indiana and Ohio, and its NGL pipelines and storage facilities are located in Louisiana and Texas. Loews Hotels & Co operates a chain of 25 hotels, 24 of which are in the United States and one of which is in Canada. Eleven of these hotels are owned by Loews Hotels & Co, twelve are owned by joint ventures in which Loews Hotels & Co has noncontrolling equity interests and two are managed for unaffiliated owners. The Corporate segment consists of investment income from the Parent Company’s cash and investments, Parent Company interest expense and other unallocated Parent Company expenses. Corporate also includes the equity method of accounting for Altium Packaging . Purchase accounting adjustments have been pushed down to the appropriate subsidiary. The accounting policies of the segments are the same as those described in the summary of significant accounting policies in Note 1. In the following tables certain financial measures are presented to provide information used by management to monitor the Company’s operating performance. The Company’s CODM is the Chief Executive Officer. The CODM uses the trend of net income attributable to Loews Corporation from the most recent years to evaluate the performance of the segments and to make decisions regarding the allocation of capital. The following schedules present the reportable segments of the Company and their contribution to the consolidated financial statements. Amounts presented will not necessarily be the same as those in the individual financial statements of the Company’s subsidiaries due to adjustments for purchase accounting, income taxes and noncontrolling interests. Statements of Operations and Total assets by segment are presented in the following tables. Year Ended December 31, 2024 CNA Financial Boardwalk Pipelines Loews Hotels & Co Corporate Total (In millions) Revenues: Insurance premiums $ 10,211 $ 10,211 Net investment income 2,497 $ 32 $ 9 $ 242 2,780 Investment losses (81) (81) Non-insurance warranty revenue 1,609 1,609 Operating revenues and other 34 2,033 924 2,991 Total 14,270 2,065 933 242 17,510 Expenses: Insurance claims and policyholders’ benefits (a) 7,738 7,738 Amortization of deferred acquisition costs 1,798 1,798 Non-insurance warranty expense 1,547 1,547 Operating expenses and other (b) 1,843 1,377 873 77 4,170 Equity method (income) loss (86) 28 (58) Interest 133 183 51 74 441 Total 13,059 1,560 838 179 15,636 Income before income tax 1,211 505 95 63 1,874 Income tax expense (252) (92) (25) (11) (380) Net income 959 413 70 52 1,494 Amounts attributable to noncontrolling interests (80) (80) Net income attributable to Loews Corporation $ 879 $ 413 $ 70 $ 52 $ 1,414 December 31, 2024 Total assets $ 66,434 $ 9,853 $ 2,498 $ 3,158 $ 81,943 (a) Significant segment expenses within Insurance claims and policyholders' benefits include catastrophe losses of $358 million and unfavorable development of $48 million. Development does not include the effects of interest accretion and change in allowance for uncollectible reinsurance and deductible amounts. (b) Significant segment expenses included in Operating expenses and other: Year Ended December 31, 2024 Insurance related administrative expenses $ 1,275 $ 1,275 Operating expenses $ 633 $ 580 1,213 Depreciation and amortization 429 93 $ 2 524 Other (c) 568 315 200 75 1,158 Operating expenses and other $ 1,843 $ 1,377 $ 873 $ 77 $ 4,170 (c) Other expenses for each reportable segment include: CNA Financial: reflects expenses not directly related to insurance operations, which includes certain expenses related to non-insurance warranty business and claims services offerings, as well as foreign currency transaction gains and losses. For 2024, this also includes a pension settlement charge of $367 million; see Note 16 for more information. Boardwalk Pipelines: general and administrative expenses Loews Hotels & Co: general and administrative, reimbursable and asset impairment expenses Corporate: general and administrative expenses Year Ended December 31, 2023 CNA Boardwalk Pipelines Loews Hotels & Co Corporate Total (In millions) Revenues: Insurance premiums $ 9,480 $ 9,480 Net investment income 2,264 $ 11 $ 6 $ 114 2,395 Investment gains (losses) (99) 46 (53) Non-insurance warranty revenue 1,624 1,624 Operating revenues and other 30 1,625 800 2,455 Total 13,299 1,636 852 114 15,901 Expenses: Insurance claims and policyholders’ benefits (a) 7,068 7,068 Amortization of deferred acquisition costs 1,644 1,644 Non-insurance warranty expense 1,544 1,544 Operating expenses and other (b) 1,398 1,108 767 120 3,393 Equity method (income) loss (129) 9 (120) Interest 127 155 14 80 376 Total 11,781 1,263 652 209 13,905 Income (loss) before income tax 1,518 373 200 (95) 1,996 Income tax (expense) benefit (313) (90) (53) 5 (451) Net income (loss) 1,205 283 147 (90) 1,545 Amounts attributable to noncontrolling interests (111) (111) Net income (loss) attributable to Loews Corporation $ 1,094 $ 283 $ 147 $ (90) $ 1,434 December 31, 2023 Total assets $ 64,655 $ 9,785 $ 2,374 $ 2,383 $ 79,197 (a) Significant segment expenses within Insurance claims and policyholders' benefits include catastrophe losses of $236 million and unfavorable development of $48 million. Development does not include the effects of interest accretion and change in allowance for uncollectible reinsurance and deductible amounts. (b) Significant segment expenses included in Operating expenses and other: Year Ended December 31, 2023 Insurance related administrative expenses $ 1,251 $ 1,251 Operating expenses $ 395 $ 485 880 Depreciation and amortization 412 69 $ 1 482 Other (c) 147 301 213 119 780 Operating expenses and other $ 1,398 $ 1,108 $ 767 $ 120 $ 3,393 (c) Other expenses for each reportable segment include: CNA Financial: reflects expenses not directly related to insurance operations, which includes certain expenses related to non-insurance warranty business and claims services offerings, as well as foreign currency transaction gains and losses. Boardwalk Pipelines: general and administrative expenses Loews Hotels & Co: general and administrative, reimbursable and asset impairment expenses Corporate: general and administrative expenses. For 2023, this also includes a pension settlement charge of $47 million; see Note 16 for additional information. Year Ended December 31, 2022 CNA Boardwalk Pipelines Loews Hotels & Co Corporate Total (In millions) Revenues: Insurance premiums $ 8,667 $ 8,667 Net investment income (loss) 1,805 $ 3 $ 1 $ (7) 1,802 Investment losses (199) (199) Non-insurance warranty revenue 1,574 1,574 Operating revenues and other 32 1,443 720 5 2,200 Total 11,879 1,446 721 (2) 14,044 Expenses: Insurance claims and policyholders’ benefits (a) 6,653 6,653 Amortization of deferred acquisition costs 1,490 1,490 Non-insurance warranty expense 1,471 1,471 Operating expenses and other (b) 1,339 950 697 91 3,077 Equity method (income) loss (148) 9 (139) Interest 112 166 11 89 378 Total 11,065 1,116 560 189 12,930 Income (loss) before income tax 814 330 161 (191) 1,114 Income tax (expense) benefit (133) (83) (44) 37 (223) Net income (loss) 681 247 117 (154) 891 Amounts attributable to noncontrolling interests (69) (69) Net income (loss) attributable to Loews Corporation $ 612 $ 247 $ 117 $ (154) $ 822 (a) Significant segment expenses within Insurance claims and policyholders' benefits include catastrophe losses of $247 million and favorable development of $32 million. Development does not include the effects of interest accretion and change in allowance for uncollectible reinsurance and deductible amounts. (b) Significant segment expenses included in Operating expenses and other: Year Ended December 31, 2022 Insurance related administrative expenses $ 1,160 $ 1,160 Operating expenses $ 274 $ 414 688 Depreciation and amortization 396 64 $ 2 462 Other (c) 179 280 219 89 767 Operating expenses and other $ 1,339 $ 950 $ 697 $ 91 $ 3,077 (c) Other expenses for each reportable segment include: CNA Financial: reflects expenses not directly related to insurance operations, which includes certain expenses related to non-insurance warranty business and claims services offerings, as well as foreign currency transaction gains and losses. Boardwalk Pipelines: general and administrative expenses Loews Hotels & Co: general and administrative, reimbursable and asset impairment expenses Corporate: general and administrative expenses

Subsequent Event

Subsequent Event	12 Months Ended
	Dec. 31, 2024
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event CNA: First Quarter 2025 California Wildfires Estimates Pretax net catastrophe losses related to the California wildfires that occurred in January of 2025 are currently estimated between approximately $40 million and $70 million, and are anticipated to be reflected in the Company’s first quarter 2025 results.

Schedule I - Condensed Financia

Schedule I - Condensed Financial Information of Registrant	12 Months Ended
	Dec. 31, 2024
Condensed Financial Information Disclosure [Abstract]
Schedule I - Condensed Financial Information of Registrant	SCHEDULE I Condensed Financial Information of Registrant LOEWS CORPORATION BALANCE SHEETS ASSETS December 31 2024 2023 (In millions) Current assets, principally investment in short-term instruments $ 2,222 $ 2,149 Investments in securities 1,170 568 Investments in capital stocks of subsidiaries, at equity 15,623 14,889 Other assets 95 76 Total assets $ 19,110 $ 17,682 LIABILITIES AND SHAREHOLDERS’ EQUITY Current liabilities $ 143 $ 102 Long-term debt 1,785 1,782 Deferred income tax and other 116 94 Total liabilities 2,044 1,978 Shareholders’ equity 17,066 15,704 Total liabilities and shareholders’ equity $ 19,110 $ 17,682 STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) Year Ended December 31 2024 2023 2022 (In millions) Revenues: Equity in income of subsidiaries (a) $ 1,328 $ 1,501 $ 963 Net investment income, interest and other 261 131 1 Investment loss Total 1,589 1,632 964 Expenses: Administrative 76 119 84 Interest 75 80 89 Total 151 199 173 Income before income tax 1,438 1,433 791 Income tax (expense) benefit (24) 1 31 Net income 1,414 1,434 822 Equity in other comprehensive income (loss) of subsidiaries 630 884 (2,000) Total comprehensive income (loss) $ 2,044 $ 2,318 $ (1,178) SCHEDULE I (Continued) Condensed Financial Information of Registrant LOEWS CORPORATION STATEMENTS OF CASH FLOWS Year Ended December 31 2024 2023 2022 (In millions) Operating Activities: Net income $ 1,414 $ 1,434 $ 822 Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities: Equity method investees (67) (512) (3) Provision (benefit) for deferred income taxes 4 (4) (49) Changes in operating assets and liabilities, net: Receivables (6) 10 (11) Accounts payable and accrued liabilities (12) (9) (47) Trading securities (695) 576 153 Other, net 2 109 39 640 1,604 904 Investing Activities: Investments in and advances to subsidiaries 2 (217) (137) Change in investments, primarily short-term 27 29 30 Other (11) (9) 29 (199) (116) Financing Activities: Dividends paid (55) (57) (61) Purchases of treasury shares (608) (849) (729) Payment of debt (500) Other (4) (5) (7) (667) (1,411) (797) Net change in cash 2 (6) (9) Cash, beginning of year 4 10 19 Cash, end of year $ 6 $ 4 $ 10 (a) Cash dividends paid to the Company by affiliates amounted to approximately $1.3 billion, $1.0 billion and $1.0 billion for the years ended December 31, 2024, 2023 and 2022. Supplemental Information Concerning Property and Casualty Insurance Operations Consolidated Property and Casualty Operations December 31 2024 2023 (In millions) Deferred acquisition costs $ 959 $ 896 Reserves for unpaid claim and claim adjustment expenses 24,976 23,304 Discount deducted from claim and claim adjustment expense reserves above (based on interest rates ranging from 3.5% to 6.6%) 615 647 Unearned premiums 7,346 6,933 Year Ended December 31 2024 2023 2022 (In millions) Net written premiums $ 10,605 $ 9,892 $ 9,128 Net earned premiums 10,211 9,480 8,667 Net investment income 2,396 2,163 1,751 Incurred claim and claim adjustment expenses related to current year 6,330 5,667 5,181 Incurred claim and claim adjustment expenses related to prior years 42 48 (32) Amortization of deferred acquisition costs 1,798 1,644 1,490 Paid claim and claim adjustment expenses 5,189 4,601 4,302

Schedule V - Supplemental Infor

Schedule V - Supplemental Information Concerning Property and Casualty Insurance Operations	12 Months Ended
	Dec. 31, 2024
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Abstract]
Schedule V - Supplemental Information Concerning Property and Casualty Insurance Operations	SCHEDULE V LOEWS CORPORATION AND SUBSIDIARIES Supplemental Information Concerning Property and Casualty Insurance Operations Consolidated Property and Casualty Operations December 31 2024 2023 (In millions) Deferred acquisition costs $ 959 $ 896 Reserves for unpaid claim and claim adjustment expenses 24,976 23,304 Discount deducted from claim and claim adjustment expense reserves above (based on interest rates ranging from 3.5% to 6.6%) 615 647 Unearned premiums 7,346 6,933 Year Ended December 31 2024 2023 2022 (In millions) Net written premiums $ 10,605 $ 9,892 $ 9,128 Net earned premiums 10,211 9,480 8,667 Net investment income 2,396 2,163 1,751 Incurred claim and claim adjustment expenses related to current year 6,330 5,667 5,181 Incurred claim and claim adjustment expenses related to prior years 42 48 (32) Amortization of deferred acquisition costs 1,798 1,644 1,490 Paid claim and claim adjustment expenses 5,189 4,601 4,302
Schedule I - Condensed Financial Information of Registrant	SCHEDULE I Condensed Financial Information of Registrant LOEWS CORPORATION BALANCE SHEETS ASSETS December 31 2024 2023 (In millions) Current assets, principally investment in short-term instruments $ 2,222 $ 2,149 Investments in securities 1,170 568 Investments in capital stocks of subsidiaries, at equity 15,623 14,889 Other assets 95 76 Total assets $ 19,110 $ 17,682 LIABILITIES AND SHAREHOLDERS’ EQUITY Current liabilities $ 143 $ 102 Long-term debt 1,785 1,782 Deferred income tax and other 116 94 Total liabilities 2,044 1,978 Shareholders’ equity 17,066 15,704 Total liabilities and shareholders’ equity $ 19,110 $ 17,682 STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) Year Ended December 31 2024 2023 2022 (In millions) Revenues: Equity in income of subsidiaries (a) $ 1,328 $ 1,501 $ 963 Net investment income, interest and other 261 131 1 Investment loss Total 1,589 1,632 964 Expenses: Administrative 76 119 84 Interest 75 80 89 Total 151 199 173 Income before income tax 1,438 1,433 791 Income tax (expense) benefit (24) 1 31 Net income 1,414 1,434 822 Equity in other comprehensive income (loss) of subsidiaries 630 884 (2,000) Total comprehensive income (loss) $ 2,044 $ 2,318 $ (1,178) SCHEDULE I (Continued) Condensed Financial Information of Registrant LOEWS CORPORATION STATEMENTS OF CASH FLOWS Year Ended December 31 2024 2023 2022 (In millions) Operating Activities: Net income $ 1,414 $ 1,434 $ 822 Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities: Equity method investees (67) (512) (3) Provision (benefit) for deferred income taxes 4 (4) (49) Changes in operating assets and liabilities, net: Receivables (6) 10 (11) Accounts payable and accrued liabilities (12) (9) (47) Trading securities (695) 576 153 Other, net 2 109 39 640 1,604 904 Investing Activities: Investments in and advances to subsidiaries 2 (217) (137) Change in investments, primarily short-term 27 29 30 Other (11) (9) 29 (199) (116) Financing Activities: Dividends paid (55) (57) (61) Purchases of treasury shares (608) (849) (729) Payment of debt (500) Other (4) (5) (7) (667) (1,411) (797) Net change in cash 2 (6) (9) Cash, beginning of year 4 10 19 Cash, end of year $ 6 $ 4 $ 10 (a) Cash dividends paid to the Company by affiliates amounted to approximately $1.3 billion, $1.0 billion and $1.0 billion for the years ended December 31, 2024, 2023 and 2022. Supplemental Information Concerning Property and Casualty Insurance Operations Consolidated Property and Casualty Operations December 31 2024 2023 (In millions) Deferred acquisition costs $ 959 $ 896 Reserves for unpaid claim and claim adjustment expenses 24,976 23,304 Discount deducted from claim and claim adjustment expense reserves above (based on interest rates ranging from 3.5% to 6.6%) 615 647 Unearned premiums 7,346 6,933 Year Ended December 31 2024 2023 2022 (In millions) Net written premiums $ 10,605 $ 9,892 $ 9,128 Net earned premiums 10,211 9,480 8,667 Net investment income 2,396 2,163 1,751 Incurred claim and claim adjustment expenses related to current year 6,330 5,667 5,181 Incurred claim and claim adjustment expenses related to prior years 42 48 (32) Amortization of deferred acquisition costs 1,798 1,644 1,490 Paid claim and claim adjustment expenses 5,189 4,601 4,302

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pay vs Performance Disclosure
Net Income (Loss)	$ 1,414	$ 1,434	$ 822

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Dec. 31, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Insider Trading Policies and Pr

Insider Trading Policies and Procedures	12 Months Ended
	Dec. 31, 2024
Insider Trading Policies and Procedures [Line Items]
Insider Trading Policies and Procedures Adopted	true

Cybersecurity Risk Management a

Cybersecurity Risk Management and Strategy Disclosure	12 Months Ended
	Dec. 31, 2024
Cybersecurity Risk Management, Strategy, and Governance [Line Items]
Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]	Identifying, assessing, and managing material cybersecurity risks is an important component of our overall enterprise risk management program. As with the management of risks generally, given our holding company structure, the management of cybersecurity risks involves coordination between the parent company and our subsidiaries. The parent company and each subsidiary are responsible for developing cybersecurity programs appropriate for their respective entities, including as may be required by applicable law or regulation. These programs have been developed based on the National Institute of Standards and Technology Cybersecurity Framework and seek to protect each entity against cybersecurity risks and foster each entity’s ability to respond to cybersecurity events. Among other things, these programs generally involve maturity evaluations and assessments by third parties, vulnerability scanning, employee testing and training, technical and business team-focused tabletop exercises, incident response plans and data security assessments of third-party service providers as a part of vendor management. Risks from cybersecurity threats, in the future may, among other things, cause material disruptions to our or our subsidiaries’ operations, which may materially affect our and/or their business, results of operations, cash flows, financial condition and/or equity. For more information about these risks, see the risk factor titled “ Failures or interruptions in or breaches to our or our subsidiaries’ computer systems or information technology or communication infrastructure or those of our third party vendors could materially and adversely affect our or our subsidiaries’ operations ” under Item 1A.
Cybersecurity Risk Management Processes Integrated [Flag]	true
Cybersecurity Risk Management Processes Integrated [Text Block]	Identifying, assessing, and managing material cybersecurity risks is an important component of our overall enterprise risk management program. As with the management of risks generally, given our holding company structure, the management of cybersecurity risks involves coordination between the parent company and our subsidiaries. The parent company and each subsidiary are responsible for developing cybersecurity programs appropriate for their respective entities, including as may be required by applicable law or regulation. These programs have been developed based on the National Institute of Standards and Technology Cybersecurity Framework and seek to protect each entity against cybersecurity risks and foster each entity’s ability to respond to cybersecurity events. Among other things, these programs generally involve maturity evaluations and assessments by third parties, vulnerability scanning, employee testing and training, technical and business team-focused tabletop exercises, incident response plans and data security assessments of third-party service providers as a part of vendor management.
Cybersecurity Risk Management Third Party Engaged [Flag]	true
Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]	true
Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]	false
Cybersecurity Risk Board of Directors Oversight [Text Block]	Our Board has assigned oversight of cybersecurity risk management to the Audit Committee. The Audit Committee regularly receives reports from our and our subsidiaries’ management, including our and our subsidiaries’ senior information technology (“IT”) leadership, and third parties on cybersecurity matters. In addition, the Board receives reports addressing cybersecurity as part of our overall enterprise risk management program and to the extent cybersecurity matters are addressed in regular business updates.
Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]	Our Board has assigned oversight of cybersecurity risk management to the Audit Committee. The Audit Committee regularly receives reports from our and our subsidiaries’ management, including our and our subsidiaries’ senior information technology (“IT”) leadership, and third parties on cybersecurity matters. In addition, the Board receives reports addressing cybersecurity as part of our overall enterprise risk management program and to the extent cybersecurity matters are addressed in regular business updates.
Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]	The Audit Committee regularly receives reports from our and our subsidiaries’ management, including our and our subsidiaries’ senior information technology (“IT”) leadership, and third parties on cybersecurity matters. In addition, the Board receives reports addressing cybersecurity as part of our overall enterprise risk management program and to the extent cybersecurity matters are addressed in regular business updates.
Cybersecurity Risk Role of Management [Text Block]	Senior IT leadership (generally, chief information officers and/or chief information security officers) at the parent company and each subsidiary are responsible for developing cybersecurity programs appropriate for their respective entities, including as may be required by applicable law or regulation. These individuals’ expertise in IT and cybersecurity generally has been gained from a combination of education, including relevant degrees and/or certifications, and prior work experience. They are informed by their respective cybersecurity teams about, and monitor, the prevention, detection, mitigation and remediation of cybersecurity incidents as part of the cybersecurity programs described above. Information regarding cybersecurity risks may be elevated from senior IT leadership through a variety of different channels, including discussions between or among subsidiary and parent company management, reports to subsidiary and parent company risk committees and reports to subsidiary and parent company boards and board committees. As noted above, the Audit Committee regularly receives reports on cybersecurity matters from our and our subsidiaries’ senior IT leadership.
Cybersecurity Risk Management Positions or Committees Responsible [Flag]	true
Cybersecurity Risk Management Positions or Committees Responsible [Text Block]	Senior IT leadership (generally, chief information officers and/or chief information security officers) at the parent company and each subsidiary are responsible for developing cybersecurity programs appropriate for their respective
Cybersecurity Risk Management Expertise of Management Responsible [Text Block]	These individuals’ expertise in IT and cybersecurity generally has been gained from a combination of education, including relevant degrees and/or certifications, and prior work experience.
Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]	They are informed by their respective cybersecurity teams about, and monitor, the prevention, detection, mitigation and remediation of cybersecurity incidents as part of the cybersecurity programs described above. Information regarding cybersecurity risks may be elevated from senior IT leadership through a variety of different channels, including discussions between or among subsidiary and parent company management, reports to subsidiary and parent company risk committees and reports to subsidiary and parent company boards and board committees. As noted above, the Audit Committee regularly receives reports on cybersecurity matters from our and our subsidiaries’ senior IT leadership.
Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]	true

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 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, olefins 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 subsidiaries, the term “Parent Company” means Loews Corporation excluding its subsidiaries and the term “Net income (loss) attributable to Loews Corporation” means Net income (loss) attributable to Loews Corporation shareholders.
Accounting estimates	Accounting estimates and principles of consolidation
Principles of consolidation	The Consolidated Financial Statements include all subsidiaries and intercompany accounts and transactions have been eliminated.
Investments	Investments – Fixed maturity securities are classified as either available-for-sale or trading, and as such, they are carried at fair value. Short-term investments are carried at fair value. Changes in fair value of trading securities are reported within Net investment income on the Consolidated Statements of Operations. Changes in fair value of available-for-sale securities are reported as a component of Other comprehensive income. The cost of fixed maturity securities classified as available-for-sale is adjusted for amortization of premiums and accretion of discounts, which are included in Net investment income on the Consolidated Statements of Operations. The amortization of premium and accretion of discount for fixed maturity securities takes into consideration call and maturity dates that produce the lowest yield. For asset-backed securities included in fixed maturity securities, income is recognized using an effective yield based on anticipated prepayments and the estimated economic life of the securities. When estimates of prepayments change, the effective yield is recalculated to reflect actual payments to date and anticipated future payments predominantly using the retrospective method. Equity securities are carried at fair value. Non-redeemable preferred stock investments contain characteristics of debt securities, are priced similarly to bonds and are held primarily for income generation through periodic dividends. While recognition of gains and losses on these securities is not discretionary, the changes in fair value of non-redeemable preferred stock are not considered to be reflective of its primary operations. As such, the changes in the fair value of these securities are recorded through Investment gains (losses) on the Consolidated Statements of Operations. Common stock is owned with the intention of holding the securities primarily for market appreciation and as such, the changes in the fair value of these securities are recorded through Net investment income (loss). Carrying value of investments in limited partnerships is the owner’s share of the net asset value of each partnership, as determined by the general partner. Certain partnerships for which results are not available on a timely basis are reported on a lag, primarily three months or less. These investments are accounted for under the equity method and changes in net asset values are recorded within Net investment income on the Consolidated Statements of Operations. Mortgage loans are commercial in nature, are carried at unpaid principal balance, net of unamortized fees and an allowance for expected credit losses, and are recorded once funded. The allowance for expected credit losses on mortgage loans is developed by assessing the credit quality of pools of mortgage loans in good standing using debt service coverage ratios (“DSCR”) and loan-to-value (“LTV”) ratios. The DSCR compares a property’s net operating income to its debt service payments, including principal and interest. The LTV ratio compares the current unpaid principal balance of the loan to the estimated fair value of the underlying property collateralizing the loan. The pools developed to measure the credit loss allowance use increments of DSCR and LTV to draw distinctions between risk levels. Expected credit loss rates are applied by pool to the outstanding receivable balances. Changes in the allowance for mortgage loans are presented as a component of Investment gains (losses) on the Consolidated Statements of Operations. Mortgage loans are included in Other invested assets on the Consolidated Balance Sheets. Interest income from mortgage loans is recognized on an accrual basis using the effective yield method. Investments in derivative securities are carried at fair value with changes in fair value reported as a component of Investment gains (losses), Net investment income or Other comprehensive income (loss), depending on their hedge designation. A derivative is typically defined as an instrument whose value is “derived” from an underlying instrument, index or rate, has a notional amount, requires little or no initial investment and can be net settled. Derivatives include the following types of investments: interest rate swaps, interest rate caps and floors, put and call options, warrants, futures, forwards, commitments to purchase securities, credit default swaps and combinations of the foregoing. Derivatives embedded within non-derivative instruments (such as call options embedded in convertible bonds) must be split from the host instrument when the embedded derivative is not clearly and closely related to the host instrument. An available-for-sale security is impaired if the fair value of the security is less than its cost adjusted for accretion, amortization and allowance for credit losses. When a security is impaired, it is evaluated to determine whether there is an intent to sell the security before recovery of amortized cost or whether a credit loss exists. Losses on securities that are intended to be sold are recognized as impairment losses within Investment gains (losses) on the Consolidated Statements of Operations. If a credit loss exists, an allowance is established and the corresponding amount is recognized as an impairment loss within Investment gains (losses) on the Consolidated Statements of Operations. The allowance for credit losses related to available-for-sale fixed maturity securities is the difference between the present value of cash flows expected to be collected and the amortized cost basis. In subsequent periods, the allowance is reviewed, with any changes in the allowance presented as a component of Investment gains (losses) on the Consolidated Statements of Operations. Changes in the difference between the amortized cost basis, net of the allowance, and the fair value, are recognized in Other comprehensi ve income. Significant judgment is required in the determination of whether an impairment loss has occurred for a security. A consistent and systematic process is followed for determining and recording an impairment loss, including the evaluation of securities in an unrealized loss position and securities with an allowance for credit losses on at least a quarterly basis. The assessment of whether an impairment loss has occurred incorporates both quantitative and qualitative information. A credit loss exists if the present value of cash flows expected to be collected is less than the amortized cost basis. Significant assumptions enter into these cash flow projections including delinquency rates, probable risk of default, loss severity upon a default, over collateralization and interest coverage triggers and credit support from lower level tranches. All available evidence is considered when determining whether an investment requires a credit loss write-down or allowance to be recorded. Examples of such evidence may include the financial condition and near-term and long-term prospects of the issuer, whether the issuer is current with interest and principal payments, credit ratings on the security or changes in ratings over time, general market conditions and industry, sector or other specific factors and whether it is likely that the amortized cost will be recovered through the collection of cash flows.
Credit losses	Credit losses – The allowances for credit losses on fixed maturity securities, mortgage loans, reinsurance receivables, insurance receivables and trade receivables are valuation accounts that are reported as a reduction of a financial asset’s cost basis and are measured on a pool basis when similar risk characteristics exist. The allowance is estimated using relevant available information from both internal and external sources. Historical credit loss experience provides the basis for the estimation of expected credit losses and adjustments may be made to reflect current conditions and reasonable and supportable forecasts. Adjustments to historical loss information are made for additional factors that come to the Company’s attention. This could include significant shifts in counterparty financial strength ratings, aging of past due receivables, amounts sent to collection agencies, or other underlying portfolio changes. Current and forecast economic conditions are considered, using a variety of economic metrics and forecast indices. The sensitivity of expected credit losses relative to changes to the forecast of economic conditions can vary by financial asset class. A reasonable and supportable forecast period is up to 24 months from the balance sheet date. After the forecast period, the Company reverts to historical credit experience. Collateral arrangements such as letters of credit and amounts held in beneficiary trusts to mitigate credit risk are considered in the estimate of the net amount expected to be collected. Amounts are written off against the allowance when determined to be uncollectible. A policy election has been made to present accrued interest balances separately from the amortized cost basis of assets, and a practical expedient has been elected to exclude the accrued interest from the tabular disclosures for mortgage loans and available-for-sale securities. An election has been made not to estimate an allowance for credit losses on accrued interest receivables. The accrual of interest income is discontinued and the asset is placed on nonaccrual status within 90 days of the interest becoming delinquent. Interest accrued but not received for assets on nonaccrual status is reversed through Net investment income. Interest received for assets that are on nonaccrual status is recognized as payment is received. The asset is returned to accrual status when the principal and interest amounts contractually due are brought current, and future payments are expected. Interest receivables are presented in Receivables on the Consolidated Balance Sheet.
Equity method investments	Equity method investments
Hedging	Hedging
Securities lending activities	Securities lending activities – The Company lends securities for the purpose of enhancing income or to finance positions to unrelated parties who have been designated as primary dealers by the Federal Reserve Bank of New York. Borrowers of these securities must deposit and maintain collateral with the Company of no less than 100% of the fair value of the securities loaned. United States of America (“U.S.”) Government securities and cash are accepted as collateral. The Company maintains effective control over loaned securities and, therefore, continues to report such securities as investments on the Consolidated Balance Sheets. Securities lending is typically done on a matched-book basis where the collateral is invested to substantially match the term of the loan. This matching of terms tends to limit risk. In accordance with the Company’s lending agreements, securities on loan are returned immediately to the Company upon notice. Collateral is not reflected as an asset of the Company. There was no collateral held at December 31, 2024 and 2023.
Revenue recognition	Revenue recognition – Premiums on property and casualty insurance contracts are recognized in proportion to the underlying risk insured and are primarily earned ratably over the term of the policies. Premiums on long-term care contracts are earned ratably over the policy year in which they are due. The reserve for unearned premiums represents the portion of premiums written relating to the unexpired terms of coverage. Property and casualty contracts that are retrospectively rated or subject to audit premiums contain provisions that result in an adjustment to the initial policy premium depending on the contract provisions. These provisions stipulate the adjustment due to loss experience of the insured during the coverage period, or changes in the level of exposure to insurance risk. For such contracts, CNA estimates the amount of ultimate premiums that it may earn upon completion of the coverage period and recognizes either an asset or a liability for the difference between the initial policy premium and the estimated ultimate premium. CNA either adjusts such estimated ultimate premium amounts during the course of the coverage period based on actual results to date or by conducting premium audits after the policy has expired to determine the final exposure to insured risks. The resulting adjustment is recorded as either a reduction of or an increase to the earned premiums for the period. Insurance receivables include balances due currently or in the future, including amounts due from insureds related to paid losses under high deductible policies, and are presented at unpaid balances, net of an allowance for doubtful accounts. As of December 31, 2024 and 2023, an allowance for doubtful accounts of $26 million and $28 million for insurance receivables has been established using a loss rate methodology to determine expected credit losses for premium receivables. This methodology uses CNA’s historical annual credit losses relative to gross premium written to develop a range of credit loss rates for each dollar of gross written premium underwritten. Additionally, an expected credit loss for amounts due from insureds under high deductible and retrospectively rated policies is calculated on a pool basis, informed by historical default rate data obtained from major rating agencies. Changes in the allowance are presented as a component of Other operating expenses on the Consolidated Statements of Operations. Amounts are considered past due based on policy payment terms. Insurance receivables and any related allowance are written off after collection efforts are exhausted or a negotiated settlement is reached. CNA’s non-insurance warranty revenues are primarily generated from separately-priced service contracts that provide mechanical breakdown and other coverages to vehicle or consumer goods owners, which generally provide coverage from one month to ten years. For warranty products where CNA acts as the principal in the transaction, Non-insurance warranty revenue is reported on a gross basis, with amounts paid by customers reported as Non-insurance warranty revenue and commissions paid to agents and dealers reported as Non-insurance warranty expense on the Consolidated Statements of Operations. Additionally, CNA provides warranty administration services for dealer and manufacturer warranty products. Non-insurance revenues are recognized when obligations under the terms of the contract with CNA’s customers are satisfied, which is generally over time as obligations are fulfilled. CNA recognizes non-insurance warranty revenue over the service period in proportion to the actuarially determined expected claims emergence pattern. Customers predominantly pay in full at the inception of the warranty contract. The liability for unearned warranty revenue, reported as Deferred non-insurance warranty revenue on the Consolidated Balance Sheets, represents the unearned portion of revenue in advance of CNA’s performance, including amounts which are refundable upon cancellation. Contract costs to obtain or fulfill non-insurance warranty contracts with customers are deferred and recorded as Deferred non-insurance warranty acquisition expenses on the Consolidated Balance Sheets. These costs are expected to be recoverable over the term of the contract and are amortized in the same manner the related revenue is recognized. CNA evaluates deferred costs for recoverability including consideration of anticipated investment income. Adjustments to deferred costs, if necessary, are recorded in the current period results of operations. Boardwalk Pipelines primarily earns revenues by providing transportation and storage services for natural gas and natural gas liquids, olefins and other hydrocarbons (referred to together as “NGLs”) on a firm and interruptible basis and providing ethane supply and transportation services for industrial customers in Louisiana and Texas. Boardwalk Pipelines also provides interruptible natural gas parking and lending services. The majority of Boardwalk Pipelines’ operating subsidiaries are subject to Federal Energy Regulatory Commission (“FERC”) regulations and certain revenues collected, under certain circumstances, may be subject to possible refunds to its customers. An estimated refund liability is recorded considering regulatory proceedings, advice of counsel and estimated total exposure. The majority of Boardwalk Pipelines’ revenues are from firm service contracts which are accounted for as a single promise to stand ready each month of the contract term to provide the committed capacity for either transportation or storage services. The transaction price is comprised of a fixed fee based on the capacity reserved plus a usage fee paid on the volume of commodity transported or injected and withdrawn from storage. Both the fixed and the usage fees are allocated to the single performance obligation of providing transportation or storage service and recognized over time as control is passed to the customer. These service contracts can range in term from one Loews Hotels & Co provides lodging and related goods and services as well as management and marketing services. Lodging and related revenues are recognized as the guest takes possession of the goods or receives the services. Management and marketing services revenues are recognized as the services are provided and billed on a monthly basis. In addition, Loews Hotels & Co recognizes revenue for the reimbursement of payroll and other expenses as they are incurred on behalf of the owners of joint venture and managed hotel properties.
Claim and claim adjustment expense reserves	Claim and claim adjustment expense reserves – Claim and claim adjustment expense reserves, except reserves for structured settlements not associated with asbestos and environmental pollution (“A&EP”) and workers’ compensation lifetime claims, are not discounted and are based on (i) case basis estimates for losses reported on direct business, adjusted in the aggregate for ultimate loss expectations; (ii) estimates of incurred but not reported losses; (iii) estimates of losses on assumed reinsurance; (iv) estimates of future expenses to be incurred in the settlement of claims; (v) estimates of salvage and subrogation recoveries and (vi) estimates of amounts due from insureds related to losses under high deductible policies. Management considers current conditions and trends as well as past CNA and industry experience in establishing these estimates. The effects of inflation, which can be significant, are implicitly considered in the reserving process and are part of the recorded reserve balance. Ceded claim and claim adjustment expense reserves are reported as a component of Receivables on the Consolidated Balance Sheets. Claim and claim adjustment expense reserves are presented net of anticipated amounts due from insureds related to losses under deductible policies of $1.3 billion and $1.2 billion as of December 31, 2024 and 2023. A significant portion of these amounts are supported by collateral. CNA also has an allowance for uncollectible deductible amounts, which is presented as a component of the allowance for doubtful accounts included in Receivables on the Consolidated Balance Sheets. Structured settlements have been negotiated for certain property and casualty insurance claims. Structured settlements are agreements to provide fixed periodic payments to claimants. CNA’s obligations for structured settlements not funded by annuities are included in claim and claim adjustment expense reserves and are discounted at a weighted average interest rate of 6.6% and 6.4% as of December 31, 2024 and 2023. This interest rate is based on the expected yield of the assets that support the reserves and reinvestment assumptions. As of December 31, 2024 and 2023, the discounted reserves for unfunded structured settlements were $444 million and $465 million, net of discount of $535 million and $559 million. For the years ended December 31, 2024, 2023 and 2022, the amount of interest recognized on the discounted reserves of unfunded structured settlements was $33 million, $34 million and $36 million. This interest accretion is presented as a component of Insurance claims and policyholders’ benefits on the Consolidated Statements of Operations but is excluded from the disclosure of prior year loss reserve development. Workers’ compensation lifetime claim reserves are calculated using mortality assumptions determined through statutory regulation and economic factors. As of December 31, 2024 and 2023, workers’ compensation lifetime claim reserves are discounted at a 3.5% interest rate. As of December 31, 2024 and 2023, the discounted reserves for workers’ compensation lifetime claim reserves were $179 million and $196 million, net of discount of $80 million and $88 million. For the years ended December 31, 2024, 2023 and 2022, the amount of interest accretion recognized on the discounted reserves of workers’ compensation lifetime claim reserves was $6 million, $9 million and $9 million. This interest accretion is presented as a component of Insurance claims and policyholders’ benefits on the Consolidated Statements of Operations, but is excluded from the disclosure of prior year loss reserve development.
Future policy benefit reserves	Future policy benefit reserves – Future policy benefit reserves are associated with CNA’s run-off long-term care business 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. The liability for future policyholder benefits (“LFPB”) is computed using the net level premium method, which incorporates cash flow and discount rate assumptions. Under the net level premium method, the LFPB is equal to the present value of future benefits and claim settlement expenses less the present value of future net premiums. Net premiums are equal to gross premiums multiplied by the Net Premium Ratio (“NPR”). The NPR is generally the ratio of the present value of benefits and expense payments to the present value of gross premiums, expected over the lifetime of the policy. As a result of the modified retrospective adoption of ASU 2018-12, CNA’s NPR calculation incorporates the original locked in discount rate and the reserve balance as of the transition date of January 1, 2021. The key cash flow assumptions used to estimate the LFPB are morbidity, persistency, anticipated future premium rate increases and expenses. Morbidity is the frequency and severity of injury, illness, sickness and diseases contracted. Persistency is the percentage of policies remaining in force and can be affected by policy lapses, benefit reductions and death. Future premium rate increases are generally subject to regulatory approval, and therefore the exact timing and size of the approved rate increases are unknown. Expense assumptions relate to claim adjudication. The practical expedient was not elected that allows locking in the expense assumption. The carried LFPB discount rate is determined using the upper-medium grade fixed income instrument yield curve. CNA has elected to update the NPR and the LFPB for actual experience on a quarterly basis. A quarterly assessment is also made as to whether evidence suggests that cash flow assumptions should be updated. Annually, in the third quarter, actuarial analysis is performed on policyholder morbidity, persistency, premium rate increase and expense experience. This analysis, combined with judgment, informs the setting of updated cash flow assumptions used to estimate the LFPB. Actuarial analysis includes predictive modeling, actual to expected experience comparisons and trend analysis. Applicable industry research is also considered. The effect of changes in cash flow assumptions and actual variances from expected experience are recorded in the results of operations within Insurance claims and policyholders’ benefits. Quarterly, to derive the upper-medium grade fixed income instrument yield discount rate assumption, a published spot rate curve constructed from single-A rated U.S. dollar denominated corporate bonds is used. Linear interpolation to determine yield assumptions for tenors that fall between points for which observable rates are available is used. For cash flows that are projected to occur beyond the tenor for which market-observable rates are available, CNA applies judgment to estimate a normative rate which it grades to over 10 years. The effect of changes in discount rate assumptions are recorded in Other comprehensive income (loss). Quarterly, the updated NPR is used to derive an updated LFPB as of the beginning of the current quarter measured at the original locked in discount rate. The updated LFPB is then compared to the existing carrying amount of the liability as of the same date (measured at the original locked in discount rate) to determine the re-measurement gain (loss), which is presented parenthetically within the Insurance claims and policyholders’ benefits line on the Consolidated Statements of Operations. Insurance contracts are grouped into cohorts according to issue year. Contracts assumed through reinsurance are generally included within the same cohorts as contracts issued directly, according to issue year. The issue year for assumed contracts is defined according to the date that assumption of insurance risk incepted. For assumed contracts that were reinsured concurrently with the issuance of the underlying direct contract, issue year is defined as the year that the underlying policy was issued. For contracts that were already in-force when assumed, issue year is defined as the year in which the reinsurance agreement incepted. For group long-term care business, issue year is defined as the year the individual insurance certificate was issued. Long-term care is CNA’s only long-duration product line, therefore, cohorts are not further disaggregated by product.
Insurance-related assessments	Insurance-related assessments – Liabilities for insurance-related assessments are accrued when an assessment is probable, when it can be reasonably estimated and when the event obligating the entity to pay an imposed or probable assessment has occurred. Liabilities for insurance-related assessments are not discounted and are included as part of Other liabilities on the Consolidated Balance Sheets. As of December 31, 2024 and 2023, the liability balances were $86 million and $84 million.
Reinsurance	Reinsurance – Reinsurance accounting allows for contractual cash flows to be reflected as premiums and losses. To qualify for reinsurance accounting, reinsurance agreements must include risk transfer. To meet risk transfer requirements, a reinsurance contract must include both insurance risk, consisting of underwriting and timing risk, and a reasonable possibility of a significant loss for the assuming entity. Reinsurance receivables related to paid losses are presented at unpaid balances. Reinsurance receivables related to unpaid losses are estimated in a manner consistent with claim and claim adjustment expense reserves or future policy benefit reserves. Reinsurance receivables are reported net of an allowance for doubtful accounts on the Consolidated Balance Sheets. The cost of reinsurance is primarily accounted for over the life of the underlying reinsured policies using assumptions consistent with those used to account for the underlying policies or over the reinsurance contract period. The ceding of insurance does not discharge the primary liability of CNA. As of December 31, 2024 and 2023, an allowance for doubtful accounts of $21 million and $22 million have been established for each year for reinsurance receivables, which relates to both amounts already billed on ceded paid losses as well as ceded reserves that will be billed when losses are paid in the future. For assessing expected credit losses, CNA separates reinsurance receivables into two pools: voluntary reinsurance receivables and involuntary receivables related to mandatory pools. CNA has not recorded an allowance for involuntary pools as there is no perceived credit risk. The principal credit quality indicator used in the valuation of the allowance on voluntary reinsurance receivables is the financial strength rating of the reinsurer sourced from major rating agencies. If the reinsurer is unrated, an internal financial strength rating is assigned based on CNA’s historical loss experience and the assessment of the reinsurance counterparty’s risk profile, which generally corresponds with a B rating. Reinsurer financial strength ratings are updated and reviewed on an annual basis or sooner if CNA becomes aware of significant changes related to a reinsurer. The allowance for doubtful accounts on reinsurance receivables is estimated on the basis of periodic evaluations of balances due from reinsurers, reinsurer financial strength rating and solvency, industry experience and current and forecast economic conditions. Because billed receivables generally approximate 6% or less of total reinsurance receivables, the age of the reinsurance receivables related to paid losses is not a significant input into the allowance analysis. Changes in the allowance for doubtful accounts on reinsurance receivables are presented as a component of Insurance claims and policyholders’ benefits on the Consolidated Statements of Operations. Amounts are considered past due based on the reinsurance contract terms. Reinsurance receivables related to paid losses and any related allowance are written off after collection efforts have been exhausted or a negotiated settlement is reached with the reinsurer. Reinsurance receivables from insolvent insurers related to paid losses are written off when the settlement due from the estate can be reasonably estimated. At the time reinsurance receivables related to paid losses are written off, any required adjustment to reinsurance receivables related to unpaid losses is recorded as a component of Insurance claims and policyholders’ benefits on the Consolidated Statements of Operations. A loss portfolio transfer is a retroactive reinsurance contract. If the cumulative claim and allocated claim adjustment expenses ceded under a loss portfolio transfer exceed the consideration paid, the resulting gain from such excess is deferred and amortized into earnings in future periods in proportion to actual recoveries under the loss portfolio transfer. In any period in which there is a revised estimate of claim and allocated claim adjustment expenses and the loss portfolio transfer is in a gain position, the deferred gain is recalculated as if the revised estimate was available at the inception date of the loss portfolio transfer and the change in the deferred gain is recognized in earnings.
Deferred acquisition costs	Deferred acquisition costs – Deferrable acquisition costs include commissions, premium taxes and certain underwriting and policy issuance costs which are incremental direct costs of successful contract acquisitions. Acquisition costs related to property and casualty business are deferred and amortized ratably over the period the related premiums are earned. Deferred acquisition costs are presented net of ceding commissions and other ceded acquisition costs. CNA evaluates deferred acquisition costs for recoverability. Anticipated investment income is considered in the determination of the recoverability of deferred acquisition costs. Adjustments, if necessary, are recorded in current period results of operations.
Policyholder dividends	Policyholder dividends – Policyholder dividends are paid to participating policyholders within the workers’ compensation and surety lines of business. Net written premiums for participating dividend policies were approximately 2% of total net written premiums for each of the years ended December 31, 2024, 2023 and 2022. Dividends to policyholders are accrued according to CNA’s best estimate of the amount to be paid in accordance with contractual provisions and applicable state laws. Dividends to policyholders are presented as a component of Insurance claims and policyholders’ benefits on the Consolidated Statements of Operations and Other liabilities on the Consolidated Balance Sheets.
Goodwill and other intangible assets	Goodwill and other intangible assets – Goodwill represents the excess of purchase price over fair value of net assets of acquired entities. Goodwill is tested for impairment annually or when certain triggering events require additional tests. Subsequent reversal of a goodwill impairment charge is not permitted.
Property, plant and equipment	Property, plant and equipment – Property, plant and equipment is carried at cost less accumulated depreciation and amortization. Depreciation is computed principally by the straight-line method over the estimated useful lives of the various classes of properties. Leaseholds and leasehold improvements are depreciated or amortized over the terms of the related leases (including optional renewal periods, where appropriate) or the estimated lives of improvements, if less than the lease term. The principal service lives used in computing provisions for depreciation are as follows: Years Pipeline equipment 30 to 50 Hotel properties and other 3 to 40
Impairment of long-lived assets	Impairment of long-lived assets – Long-lived and finite-lived intangible assets are reviewed for impairment when changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Long-lived assets and intangibles with finite lives, under certain circumstances, are reported at the lower of carrying amount or fair value. Assets to be disposed of and assets not expected to provide any future service potential are recorded at the lower of carrying amount or fair value less cost to sell.
Income taxes	Income taxes − The Company and its eligible subsidiaries file a consolidated tax return. Deferred income taxes are recognized for temporary differences between the financial statement and tax return bases of assets and liabilities, based on enacted tax rates and other provisions of the tax law. The effect of a change in tax laws or rates on deferred tax assets and liabilities is recognized in income in the period in which such change is enacted. Future tax benefits are recognized to the extent that realization of such benefits is more likely than not, and a valuation allowance is established for any portion of a deferred tax asset that management believes may not be realized. The Company recognizes uncertain tax positions that it has taken or expects to take on a tax return. The tax benefit of a qualifying position is the largest amount of tax benefit that is greater than 50% likely of being realized upon ultimate settlement with a taxing authority having full knowledge of all relevant information. See Note 11 for additional information on the provision for income taxes.
Pension and postretirement benefits	Pension and postretirement benefits – The overfunded or underfunded status of defined benefit plans is recognized in Other assets or Other liabilities on the Consolidated Balance Sheets. Changes in funded status related to prior service costs and credits and actuarial gains and losses are recognized in the year in which the changes occur through Accumulated Other Comprehensive Income (“AOCI”). Benefit plan assets and obligations are measured at December 31. Annual service cost, interest cost, expected return on plan assets, amortization of prior service costs and credits and amortization of actuarial gains and losses are recognized in the Consolidated Statements of Operations.
Stock-based compensation	Stock-based compensation – Compensation expense is recorded upon issuance, modification or cancellation of all share-based payment awards granted, primarily on a straight-line basis over the requisite service period, generally three years. Restricted Stock Units are valued using the grant-date fair value of Loews Corporation’s stock.
Net income per share	Net income per share – Basic net income per share excludes dilution and is computed by dividing net income attributable to common stock by the weighted average number of Loews Corporation 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 Loews Corporation common stock were exercised or converted into common stock. For the years ended December 31, 2024, 2023 and 2022, approximately 0.3 million, 0.3 million and 0.4 million potential shares attributable to issuances and exercises under the Loews Corporation 2016 Incentive Compensation Plan and the prior plan were included in the calculation of diluted net income per share, and there were no
Foreign currency	Foreign currency – Foreign currency translation gains and losses are reflected in Shareholders’ equity as a component of AOCI. Foreign subsidiaries’ balance sheet accounts are translated at the exchange rates in effect at each reporting date and income statement accounts are translated at the average exchange rates during the reporting period. There were foreign currency transaction gains (losses) of $(7) million, $8 million and $(20) million for the years ended December 31, 2024, 2023 and 2022 included in the Consolidated Statements of Operations.
Regulatory accounting	Regulatory accounting – The majority of Boardwalk Pipelines’ revenues are earned from operating subsidiaries that are regulated by FERC. Texas Gas Transmission, LLC (“Texas Gas”), a wholly owned subsidiary of Boardwalk Pipelines, applies regulatory accounting to certain assets for GAAP purposes, which records certain assets and liabilities consistent with the economic effect of the manner in which independent third party regulators establish rates. Gulf South Pipeline Company, LLC (“Gulf South”), a wholly owned subsidiary of Boardwalk Pipelines, has implemented fuel trackers, for which regulatory accounting is applied. Accordingly, the value of fuel received from customers paying the maximum tariff rate and the related value of fuel used in transportation are recorded to a regulatory asset or liability depending on whether Gulf South uses more fuel than it collects from customers or collects more fuel than it uses. Other than as described for Texas Gas and the fuel trackers for Gulf South, regulatory accounting is not applicable to Boardwalk Pipelines’ other FERC regulated entities or operations.
Accounting changes and Recently issued ASUs	Accounting changes – In November of 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“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 (“CODM”). The guidance is effective for fiscal years beginning after December 15, 2023 and interim periods within fiscal years beginning after December 15, 2024. The guidance has been adopted retrospectively, with comparative period segment disclosures adjusted to reflect the change in accounting guidance. See Note 20 for additional information. In August of 2018, the FASB issued ASU 2018-12, “Financial Services – Insurance (Topic 944): Targeted Improvements to the Accounting for Long-Duration Contracts” (“ASU 2018-12”). The updated accounting guidance requires changes to the measurement and disclosure of long-duration contracts. Entities are required to review, and update if there is a change, cash flow assumptions (including morbidity and persistency) used to measure the liability for future policyholder benefits (“LFPB”) at least annually. The LFPB must also be updated for actual experience at least annually. The discount rate assumption used to measure the LFPB must be updated quarterly using an upper-medium grade (low credit risk) fixed-income instrument yield, commonly interpreted as a single-A rate. The guidance was adopted effective January 1, 2023, using the modified retrospective method applied as of the transition date of January 1, 2021. CNA’s run-off long-term care business is in scope of the guidance. Prior periods presented in the financial statements have been adjusted to reflect application of the guidance. While the requirements of the guidance represent a material change from legacy accounting, it does not impact capital and surplus under statutory accounting practices, cash flows or the underlying economics of the business. Recently issued ASUs - In December of 2023, the FASB issued ASU 2023-08, “Intangibles-Goodwill and Other- Crypto Assets (Subtopic 350-60): Accounting for and Disclosure of Crypto Assets.” The updated accounting guidance requires that an entity measure crypto assets at fair value in the statement of financial position each reporting period and recognize changes from remeasurement in net income. The guidance is effective for fiscal years beginning after December 15, 2024, including interim periods within those fiscal years. The update requires a cumulative-effect adjustment to the opening balance at the date of adoption. At adoption on January 1, 2025, the Company estimates an increase to Retained earnings of $5 million. 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.
Fair value measurement	Fair value is the price that would be received upon sale of an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The following fair value hierarchy is used in selecting inputs, with the highest priority given to Level 1, as these are the most transparent or reliable: • Level 1 – Quoted prices for identical instruments in active markets. • Level 2 – Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations in which all significant inputs are observable in active markets. • Level 3 – Valuations derived from valuation techniques in which one or more significant inputs are not observable. Prices may fall within Level 1, 2 or 3 depending upon the methodology and inputs used to estimate fair value for each specific security. In general, securities are priced using third party pricing services. Securities not priced by pricing services are submitted to independent brokers for valuation and, if those are not available, internally developed pricing models are used to value assets using a methodology and inputs that market participants presumably would use to value the assets. Prices obtained from third-party pricing services or brokers are not adjusted. Control procedures are performed over information obtained from pricing services and brokers to ensure prices received represent a reasonable estimate of fair value and to confirm representations regarding whether inputs are observable or unobservable. Procedures may include: (i) the review of pricing service methodologies or broker pricing qualifications, (ii) back-testing, where past fair value estimates are compared to actual transactions executed in the market on similar dates, (iii) exception reporting, where period-over-period changes in price are reviewed and challenged with the pricing service or broker based on exception criteria and (iv) detailed analysis, where an independent analysis of the inputs and assumptions used to price individual securities is performed.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2024
Accounting Policies [Abstract]
Schedule of Principal Service Lives	The principal service lives used in computing provisions for depreciation are as follows: Years Pipeline equipment 30 to 50 Hotel properties and other 3 to 40

Investments (Tables)

Investments (Tables)	12 Months Ended
	Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Schedule of Net Investment Income	Net investment income is as follows: Year Ended December 31 2024 2023 2022 (In millions) Fixed maturity securities $ 2,050 $ 1,941 $ 1,787 Limited partnership investments 271 177 (6) Short-term investments 90 78 17 Equity securities (a) 82 63 23 Income from trading portfolio (a) 255 125 Other 129 105 65 Total investment income 2,877 2,489 1,886 Investment expenses (97) (94) (84) Net investment income $ 2,780 $ 2,395 $ 1,802 (a) Net investment income recognized due to the change in fair value of equity and trading portfolio securities held as of December 31, 2024 , 2023 and 2022 $ 93 $ 38 $ 3
Schedule of Investment Gains (Losses)	Investment gains (losses) are as follows: Year Ended December 31 2024 2023 2022 (In millions) Fixed maturity securities: Gross gains $ 48 $ 75 $ 120 Gross losses (150) (166) (261) Investment losses on fixed maturity securities (102) (91) (141) Equity securities (a) 21 4 (116) Derivative instruments (1) 64 Short-term investments and other (11) (6) Gain on acquisition of a joint venture (see Note 2) 46 Investment losses $ (81) $ (53) $ (199) (a) Investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock included within equity securities held as of December 31, 2024, 2023, and 2022 $ 19 $ 14 $ (75)
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: Year Ended December 31 2024 2023 2022 (In millions) Fixed maturity securities available-for-sale: Corporate and other bonds $ 34 $ 33 $ 62 Asset-backed 29 11 Impairment losses recognized in earnings $ 63 $ 44 $ 62
Schedule of Amortized Cost and Fair Values of Fixed Maturity Securities	The amortized cost and fair values of fixed maturity securities are as follows: December 31, 2024 Cost or Amortized Cost Gross Unrealized Gross Unrealized Allowance Estimated (In millions) Fixed maturity securities: Corporate and other bonds $ 25,839 $ 423 $ 1,305 $ 13 $ 24,944 States, municipalities and political 7,396 243 835 6,804 Asset-backed: Residential mortgage-backed 3,725 7 488 3,244 Commercial mortgage-backed 1,779 11 141 18 1,631 Other asset-backed 3,770 24 239 14 3,541 Total asset-backed 9,274 42 868 32 8,416 U.S. Treasury and obligations of 220 1 1 220 Foreign government 701 6 30 677 Fixed maturities available-for-sale $ 43,430 $ 715 $ 3,039 $ 45 $ 41,061 Fixed maturities trading 766 766 Total fixed maturity securities $ 44,196 $ 715 $ 3,039 $ 45 $ 41,827 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 Securities in Gross Unrealized Loss Position	The available-for-sale fixed maturities 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 December 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 $ 5,846 $ 165 $ 10,388 $ 1,140 $ 16,234 $ 1,305 States, municipalities and political 1,247 52 2,967 783 4,214 835 Asset-backed: Residential mortgage-backed 849 22 2,010 466 2,859 488 Commercial mortgage-backed 180 2 988 139 1,168 141 Other asset-backed 680 21 1,557 218 2,237 239 Total asset-backed 1,709 45 4,555 823 6,264 868 U.S. Treasury and obligations of 49 1 41 90 1 Foreign government 118 3 368 27 486 30 Total fixed maturity securities $ 8,969 $ 266 $ 18,319 $ 2,773 $ 27,288 $ 3,039 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. December 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 $ 2,567 $ 373 $ 2,273 $ 309 AAA 1,800 282 1,524 261 AA 4,247 730 3,817 658 A 6,330 582 5,652 517 BBB 11,548 980 11,523 1,095 Non-investment grade 796 92 942 155 Total $ 27,288 $ 3,039 $ 25,731 $ 2,995
Schedule of Activity of Allowance on Available-for-Sale Securities	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 Year Ended December 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: Securities for which credit losses were not previously recorded 9 18 27 Available-for-sale securities accounted for as PCD assets 4 4 Reductions to the allowance for credit losses: Securities sold during the period (realized) 3 1 4 Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis 1 1 Write-offs charged against the allowance 9 9 Additional increases to the allowance for credit losses on securities that had an allowance recorded in a previous period 12 12 Total allowance for credit losses $ 13 $ 32 $ 45 Year Ended December 31, 2023 Corporate Asset-backed Total (In millions) Allowance for credit losses: Balance as of January 1, 2023 $ — $ 1 $ 1 Additions to the allowance for credit losses: Securities for which credit losses were not previously recorded 10 7 17 Available-for-sale securities accounted for as PCD assets 22 22 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 security before recovery of its amortized cost basis 8 8 Write-offs charged against the allowance 15 15 Additional increases to the allowance for credit losses on securities that had an allowance recorded in a previous period 1 4 5 Total allowance for credit losses $ 4 $ 12 $ 16
Schedule of Available-for-sale Fixed Maturity Securities by Contractual Maturity	The following table presents available-for-sale fixed maturity securities by contractual maturity. December 31 2024 2023 Cost or Amortized Cost Estimated Fair Cost or Amortized Cost Estimated (In millions) Due in one year or less $ 1,761 $ 1,753 $ 1,121 $ 1,091 Due after one year through five years 11,678 11,403 11,563 11,180 Due after five years through ten years 13,083 12,365 13,359 12,573 Due after ten years 16,908 15,540 16,371 15,581 Total $ 43,430 $ 41,061 $ 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 December 31, 2024 2024 2023 2022 2021 2020 Prior Total (In millions) DSCR ≥1.6x LTV less than 55% $ 34 $ 9 $ 60 $ 169 $ 272 LTV 55% to 65% 15 $ 11 4 12 42 LTV greater than 65% 13 30 12 55 DSCR 1.2x - 1.6x LTV less than 55% $ 49 28 5 2 49 71 204 LTV 55% to 65% 53 30 21 30 20 39 193 LTV greater than 65% 46 46 DSCR ≤1.2x LTV less than 55% 21 21 LTV 55% to 65% 22 75 20 117 LTV greater than 65% 35 21 48 104 Total $ 102 $ 127 $ 236 $ 76 $ 133 $ 380 $ 1,054 (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	The following tables present the aggregate contractual or notional amount and estimated fair value related to derivative financial instruments. December 31 2024 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 $ 268 $ 2 $ 202 $ 1 Futures - short 167 1 116 Warrants 1 1 84 3 Interest rate swaps 300 4 300 13 Currency forwards 13 $ (1) Credit default swap index - purchased 2,000

Fair Value (Tables)

Fair Value (Tables)	12 Months Ended
	Dec. 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 U.S. Treasury, government-sponsored enterprises, foreign governments and redeemable preferred stock. December 31, 2024 Level 1 Level 2 Level 3 Total (In millions) Fixed maturity securities: Corporate bonds and other $ 223 $ 24,340 $ 1,278 $ 25,841 States, municipalities and political subdivisions 6,762 42 6,804 Asset-backed 7,540 876 8,416 Fixed maturities available-for-sale 223 38,642 2,196 41,061 Fixed maturities trading 766 766 Total fixed maturities $ 989 $ 38,642 $ 2,196 $ 41,827 Equity securities $ 603 $ 441 $ 20 $ 1,064 Short-term and other 4,383 70 4,453 Receivables 5 5 Payable to brokers (88) (88) 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 years ended December 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 December 31 Unrealized Gains (Losses) Recognized in Other Comprehensive Income (Loss) on Level 3 Assets and Liabilities Held at December 31 2024 Balance, January 1 Included in Net Income Included in OCI Purchases Sales Settlements Transfers into Transfers out of Level 3 Balance, December 31 (In millions) Fixed maturity securities: Corporate bonds and other $ 1,045 $ (1) $ (15) $ 352 $ (10) $ (104) $ 11 $ 1,278 $ (1) $ (21) States, municipalities and political subdivisions 44 (2) 42 (2) Asset-backed 901 9 (12) 125 (14) (83) $ (50) 876 (12) Fixed maturities available-for-sale $ 1,990 $ 8 $ (29) $ 477 $ (24) $ (187) $ 11 $ (50) $ 2,196 $ (1) $ (35) Equity securities $ 24 $ 12 $ 3 $ (19) $ 20 $ 8 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 December 31 Unrealized Gains (Losses) Recognized in Other Comprehensive Income (Loss) on Level 3 Assets and Liabilities Held at December 31 2023 Balance, January 1 Included in Net Income Included in OCI Purchases Sales Settlements Transfers into Transfers out of Level 3 Balance, December 31 (In millions) Fixed maturity securities: Corporate bonds and other $ 810 $ 38 $ 219 $ (33) $ 11 $ 1,045 $ 38 States, municipalities and political subdivisions 43 1 44 1 Asset-backed 788 $ 16 9 248 (64) 23 $ (119) 901 9 Fixed maturities available-for-sale $ 1,641 $ 16 $ 48 $ 467 $ — $ (97) $ 34 $ (119) $ 1,990 $ — $ 48 Equity securities $ 35 $ (7) $ (4) $ 24 $ (7) Net investment gains and losses are reported in Net income as follows: Major Category of Assets and Liabilities Consolidated 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. December 31, 2024 Estimated Valuation Techniques Unobservable Inputs Range (Weighted Average) (In millions) Fixed maturity securities $ 1,724 Discounted cash flow Credit spread 1% — 6% (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 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 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 December 31, 2024 Level 1 Level 2 Level 3 Total (In millions) Assets: Other invested assets, primarily mortgage loans $ 1,019 $ 987 $ 987 Liabilities: Short-term debt 4 5 5 Long-term debt 8,936 $ 7,702 966 8,668 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

Receivables (Tables)

Receivables (Tables)	12 Months Ended
	Dec. 31, 2024
Receivables [Abstract]
Summary of Receivables	December 31 2024 2023 (In millions) Reinsurance (Note 17) $ 6,072 $ 5,434 Insurance 3,697 3,470 Receivable from brokers 50 64 Accrued investment income 458 446 Income taxes 9 21 Other, primarily customer accounts 284 277 Total 10,570 9,712 Less: allowance for doubtful accounts on reinsurance receivables 21 22 allowance for other doubtful accounts 27 30 Receivables $ 10,522 $ 9,660

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2024
Property, Plant and Equipment [Abstract]
Summary of Property, Plant and Equipment	December 31 2024 2023 (In millions) Pipeline equipment (net of accumulated depreciation of $4,819 and $4,470) $ 8,478 $ 8,421 Hotel properties (net of accumulated depreciation of $646 and $560) 1,517 1,072 Other (net of accumulated depreciation of $578 and $534) 496 461 Construction in process 247 764 Property, plant and equipment $ 10,738 $ 10,718 Depreciation expense and capital expenditures are as follows: Year Ended December 31 2024 2023 2022 Depre-ciation Capital Expend. Depre-ciation Capital Depre-ciation Capital Expend. (In millions) CNA Financial $ 59 $ 105 $ 54 $ 97 $ 49 $ 50 Boardwalk Pipelines 426 365 410 383 394 352 Loews Hotels & Co 93 115 69 201 64 264 Corporate 2 1 12 2 9 Total $ 580 $ 585 $ 534 $ 693 $ 509 $ 675

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Goodwill	A summary of the changes in the carrying amount of goodwill is as follows: CNA Financial Boardwalk Pipelines Total (In millions) Balance, December 31, 2022 $ 109 $ 237 $ 346 Other adjustments 1 1 Balance, December 31, 2023 and 2024 110 237 347
Summary of Other Intangible Assets	A summary of the net carrying amount of other intangible assets is as follows: December 31, 2024 December 31, 2023 Gross Carrying Amount Accumulated Amortization Gross Carrying Amount Accumulated Amortization (In millions) Finite-lived intangible assets: Customer relationships $ 93 $ 24 $ 93 $ 21 Other 10 8 11 9 Total finite-lived intangible assets 103 32 104 30 Indefinite-lived intangible assets 76 77 Total other intangible assets $ 179 $ 32 $ 181 $ 30

Claim and Claim Adjustment Ex_2

Claim and Claim Adjustment Expense Reserves (Tables)	12 Months Ended
	Dec. 31, 2024
Insurance [Abstract]
Schedule of Net Liability for Unpaid Claim and Claim Adjustment Expenses	The table below reconciles the net liability for unpaid claim and claim adjustment expenses to the amount presented on the Consolidated Balance Sheets. December 31 2024 (In millions) Net liability for unpaid claim and claim adjustment expenses: Property & Casualty Operations $ 18,334 Other Insurance Operations (a) 929 Total net claim and claim adjustment expenses 19,263 Reinsurance receivables: (b) Property & Casualty Operations 3,348 Other Insurance Operations (c) 2,365 Total reinsurance receivables 5,713 Total gross liability for unpaid claims and claims adjustment expenses $ 24,976 (a) Other Insurance Operations amounts are related to unfunded structured settlements arising from short duration contracts. (b) Reinsurance receivables presented are gross of the allowance for uncollectible reinsurance and do not include reinsurance receivables related to paid losses. (c) The Other Insurance Operations reinsurance receivables are primarily related to A&EP claims covered under the A&EP loss portfolio transfer (“LPT”).
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. Year Ended December 31 2024 2023 2022 (In millions) Reserves, beginning of year: Gross $ 23,304 $ 22,120 $ 21,269 Ceded 5,141 5,191 4,969 Net reserves, beginning of year 18,163 16,929 16,300 Net incurred claim and claim adjustment expenses: Provision for insured events of current year 6,330 5,667 5,181 Increase (decrease) in provision for insured events of prior years 42 48 (32) Amortization of discount 39 44 44 Total net incurred (a) 6,411 5,759 5,193 Net payments attributable to: Current year events (1,093) (922) (821) Prior year events (4,096) (3,679) (3,481) Total net payments (5,189) (4,601) (4,302) Foreign currency translation adjustment and other (122) 76 (262) Net reserves, end of year 19,263 18,163 16,929 Ceded reserves, end of year 5,713 5,141 5,191 Gross reserves, end of year $ 24,976 $ 23,304 $ 22,120 (a) Total net incurred does not agree to Insurance claims and policyholders’ benefits as reflected on the Consolidated Statements of Operations due to amounts related to retroactive reinsurance deferred gain accounting and uncollectible reinsurance, which are not reflected in the table above.
Schedule of Gross and Net Carried Reserves	The following tables present the gross and net carried reserves: December 31, 2024 Property and Casualty Operations Other Insurance Operations Total (In millions) Gross Case Reserves $ 6,589 $ 1,813 $ 8,402 Gross IBNR Reserves 15,093 1,481 16,574 Total Gross Carried Claim and Claim Adjustment Expense Reserves $ 21,682 $ 3,294 $ 24,976 Net Case Reserves $ 5,573 $ 634 $ 6,207 Net IBNR Reserves 12,761 295 13,056 Total Net Carried Claim and Claim Adjustment Expense Reserves $ 18,334 $ 929 $ 19,263 December 31, 2023 Gross Case Reserves $ 5,759 $ 1,979 $ 7,738 Gross IBNR Reserves 14,184 1,382 15,566 Total Gross Carried Claim and Claim Adjustment Expense Reserves $ 19,943 $ 3,361 $ 23,304 Net Case Reserves $ 4,978 $ 685 $ 5,663 Net IBNR Reserves 12,235 265 12,500 Total Net Carried Claim and Claim Adjustment Expense Reserves $ 17,213 $ 950 $ 18,163
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 and Other Insurance Operations: Year Ended December 31 2024 2023 2022 (In millions) Medical professional liability $ (8) $ 5 $ 18 Other professional liability and management liability 49 37 50 Surety (68) (43) (83) Warranty 20 (11) (21) Commercial auto 107 33 49 General liability 75 149 67 Workers’ compensation (202) (203) (152) Other property and casualty operations (4) 10 (24) Other insurance operations 79 71 64 Total pretax (favorable) unfavorable development $ 48 $ 48 $ (32)
Schedule of Net Liability for Unpaid Claims and Claims Adjustment Expenses by Line of Business	The table below presents the net liability for unpaid claim and claim adjustment expenses, by line of business for Property & Casualty Operations: December 31 2024 (In millions) Medical professional liability $ 1,425 Other professional liability and management liability 3,967 Surety 493 Warranty 46 Commercial auto 1,247 General liability 4,356 Workers’ compensation 3,543 Other property and casualty operations 3,257 Total net liability for unpaid claim and claim adjustment expenses $ 18,334
Schedule of Incurred Claims Development	Medical Professional Liability Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses December 31, 2024 December 31 2015 (a) 2016 (a) 2017 (a) 2018 (a) 2019 (a) 2020 (a) 2021 (a) 2022 (a) 2023 (a) 2024 IBNR Cumulative Number of Claims (In millions, except reported claims data) Accident Year 2015 $ 433 $ 499 $ 510 $ 494 $ 488 $ 510 $ 501 $ 498 $ 494 $ 494 $ 11 18,228 2016 427 487 485 499 508 510 508 514 513 16 16,195 2017 412 449 458 460 455 460 456 463 18 15,384 2018 404 429 431 448 470 495 499 28 15,331 2019 430 445 458 471 469 481 43 14,515 2020 477 476 455 447 419 100 11,289 2021 377 376 374 349 117 9,935 2022 329 329 333 143 9,965 2023 340 350 162 10,424 2024 343 278 8,561 Total $ 4,244 $ 916 Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses Accident Year 2015 $ 22 $ 101 $ 230 $ 313 $ 384 $ 420 $ 444 $ 458 $ 463 $ 471 2016 18 121 246 339 401 436 460 483 489 2017 19 107 235 308 355 388 417 427 2018 21 115 211 290 349 418 453 2019 17 91 183 280 349 395 2020 11 61 139 201 258 2021 11 49 118 170 2022 10 57 122 2023 14 86 2024 13 Total $ 2,884 Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented $ 1,360 Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2015 33 Liability for unallocated claim adjustment expenses for accident years presented 32 Total net liability for unpaid claim and claim adjustment expenses $ 1,425 Net Strengthening (Releases) of Prior Accident Year Reserves Years Ended December 31 Total Accident Year 2015 $ 66 $ 11 $ (16) $ (6) $ 22 $ (9) $ (3) $ (4) $ — $ 61 2016 60 (2) 14 9 2 (2) 6 (1) 86 2017 37 9 2 (5) 5 (4) 7 51 2018 25 2 17 22 25 4 95 2019 15 13 13 (2) 12 51 2020 (1) (21) (8) (28) (58) 2021 (1) (2) (25) (28) 2022 — 4 4 2023 10 10 Total net development for the accident years presented above 13 11 (17) Total net development for accident years prior to 2015 — (6) 9 Total unallocated claim adjustment expense development 5 — — Total $ 18 $ 5 $ (8) (a) Data presented for these calendar years is required supplemental information, which is unaudited. Other Professional Liability and Management Liability Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses December 31, 2024 December 31 2015 (a) 2016 (a) 2017 (a) 2018 (a) 2019 (a) 2020 (a) 2021 (a) 2022 (a) 2023 (a) 2024 IBNR Cumulative Number of Claims (In millions, except reported claims data) Accident Year 2015 $ 888 $ 892 $ 877 $ 832 $ 807 $ 813 $ 836 $ 855 $ 858 $ 865 $ 21 17,457 2016 901 900 900 904 907 891 888 906 912 37 17,989 2017 847 845 813 791 775 758 746 752 51 18,215 2018 850 864 869 906 923 941 987 57 20,071 2019 837 845 856 876 939 970 96 19,548 2020 930 944 951 945 945 168 19,509 2021 1,037 1,038 1,009 965 311 18,377 2022 1,120 1,112 1,084 465 18,376 2023 1,149 1,166 564 19,587 2024 1,150 918 17,921 Total $ 9,796 $ 2,688 Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses Accident Year 2015 $ 60 $ 234 $ 404 $ 542 $ 612 $ 677 $ 725 $ 794 $ 808 $ 813 2016 64 248 466 625 701 736 784 826 856 2017 57 222 394 498 557 596 630 672 2018 54 282 473 599 706 779 847 2019 64 263 422 567 699 801 2020 67 248 400 523 660 2021 58 217 356 502 2022 64 225 453 2023 64 302 2024 77 Total $ 5,983 Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented $ 3,813 Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2015 98 Liability for unallocated claim adjustment expenses for accident years presented 56 Total net liability for unpaid claim and claim adjustment expenses $ 3,967 Net Strengthening (Releases) of Prior Accident Year Reserves Years Ended December 31 Total Accident Year 2015 $ 4 $ (15) $ (45) $ (25) $ 6 $ 23 $ 19 $ 3 $ 7 $ (23) 2016 (1) — 4 3 (16) (3) 18 6 11 2017 (2) (32) (22) (16) (17) (12) 6 (95) 2018 14 5 37 17 18 46 137 2019 8 11 20 63 31 133 2020 14 7 (6) — 15 2021 1 (29) (44) (72) 2022 (8) (28) (36) 2023 17 17 Total net development for the accident years presented above 44 47 41 Total net development for accident years prior to 2015 6 (10) 3 Total unallocated claim adjustment expense development — — 5 Total $ 50 $ 37 $ 49 (a) Data presented for these calendar years is required supplemental information, which is unaudited. Surety Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses December 31, 2024 December 31 2015 (a) 2016 (a) 2017 (a) 2018 (a) 2019 (a) 2020 (a) 2021 (a) 2022 (a) 2023 (a) 2024 IBNR Cumulative Number of Claims (In millions, except reported claims data) Accident Year 2015 $ 131 $ 131 $ 104 $ 79 $ 63 $ 58 $ 53 $ 45 $ 45 $ 45 $ 2 5,103 2016 124 124 109 84 67 64 58 43 43 3 5,577 2017 120 115 103 84 71 66 67 67 3 5,909 2018 114 108 91 62 56 51 49 6 6,297 2019 119 112 98 87 82 82 8 6,229 2020 128 119 81 67 57 3 4,827 2021 137 129 110 91 45 4,884 2022 155 158 132 74 4,893 2023 175 169 138 4,378 2024 171 145 2,940 Total $ 906 $ 427 Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses Accident Year 2015 $ 7 $ 26 $ 38 $ 40 $ 42 $ 44 $ 42 $ 42 $ 43 $ 43 2016 5 37 45 45 43 43 41 40 40 2017 23 37 41 46 49 62 62 63 2018 5 25 34 39 40 41 41 2019 12 34 44 59 70 74 2020 4 20 28 33 44 2021 5 20 35 42 2022 12 35 52 2023 8 27 2024 20 Total $ 446 Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented $ 460 Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2015 14 Liability for unallocated claim adjustment expenses for accident years presented 19 Total net liability for unpaid claim and claim adjustment expenses $ 493 Net Strengthening (Releases) of Prior Accident Year Reserves Years Ended December 31 Total Accident Year 2015 $ — $ (27) $ (25) $ (16) $ (5) $ (5) $ (8) $ — $ — $ (86) 2016 — (15) (25) (17) (3) (6) (15) — (81) 2017 (5) (12) (19) (13) (5) 1 — (53) 2018 (6) (17) (29) (6) (5) (2) (65) 2019 (7) (14) (11) (5) — (37) 2020 (9) (38) (14) (10) (71) 2021 (8) (19) (19) (46) 2022 3 (26) (23) 2023 (6) (6) Total net development for the accident years presented above (82) (54) (63) Total net development for accident years prior to 2015 (1) 11 (5) Total unallocated claim adjustment expense development — — — Total $ (83) $ (43) $ (68) (a) Data presented for these calendar years is required supplemental information, which is unaudited. Commercial Auto Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses December 31, 2024 December 31 2015 (a) 2016 (a) 2017 (a) 2018 (a) 2019 (a) 2020 (a) 2021 (a) 2022 (a) 2023 (a) 2024 IBNR Cumulative (In millions, except reported claims data) Accident Year 2015 $ 201 $ 199 $ 190 $ 190 $ 183 $ 181 $ 183 $ 182 $ 184 $ 184 $ 2 30,430 2016 198 186 186 186 190 195 200 197 195 1 30,457 2017 199 198 200 221 232 239 241 241 4 30,947 2018 229 227 227 245 254 255 260 2 34,333 2019 257 266 289 323 325 327 7 37,280 2020 310 303 304 298 303 14 29,182 2021 397 388 390 393 51 33,028 2022 437 465 496 90 37,230 2023 554 620 202 42,345 2024 726 447 40,718 Total $ 3,745 $ 820 Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses Accident Year 2015 $ 52 $ 96 $ 130 $ 153 $ 172 $ 175 $ 178 $ 179 $ 180 $ 182 2016 52 93 126 154 175 185 190 192 193 2017 58 107 150 178 203 225 232 235 2018 66 128 175 212 238 249 256 2019 77 147 203 257 295 312 2020 71 134 197 246 276 2021 83 168 240 305 2022 112 236 334 2023 127 270 2024 153 Total $ 2,516 Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented $ 1,229 Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2015 1 Liability for unallocated claim adjustment expenses for accident years presented 17 Total net liability for unpaid claim and claim adjustment expenses $ 1,247 Net Strengthening (Releases) of Prior Accident Year Reserves Years Ended December 31 Total Accident Year 2015 $ (2) $ (9) $ — $ (7) $ (2) $ 2 $ (1) $ 2 $ — $ (17) 2016 (12) — — 4 5 5 (3) (2) (3) 2017 (1) 2 21 11 7 2 — 42 2018 (2) — 18 9 1 5 31 2019 9 23 34 2 2 70 2020 (7) 1 (6) 5 (7) 2021 (9) 2 3 (4) 2022 28 31 59 2023 66 66 Total net development for the accident years presented above 46 28 110 Total net development for accident years prior to 2015 3 2 (3) Total unallocated claim adjustment expense development — 3 — Total $ 49 $ 33 $ 107 (a) Data presented for these calendar years is required supplemental information, which is unaudited. General Liability Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses December 31, 2024 December 31 2015 (a) 2016 (a) 2017 (a) 2018 (a) 2019 (a) 2020 (a) 2021 (a) 2022 (a) 2023 (a) 2024 IBNR Cumulative Number of Claims (In millions, except reported claims data) Accident Year 2015 $ 581 $ 576 $ 574 $ 589 $ 600 $ 602 $ 617 $ 625 $ 639 $ 656 $ 39 24,309 2016 623 659 667 671 673 683 684 704 712 27 24,901 2017 632 632 632 634 630 652 690 713 16 22,544 2018 653 644 646 639 650 679 665 83 20,553 2019 680 682 682 691 720 727 129 19,907 2020 723 722 726 736 702 237 14,964 2021 782 784 793 814 299 15,952 2022 929 928 930 515 17,527 2023 1,071 1,106 726 17,037 2024 1,271 1,144 14,632 Total $ 8,296 $ 3,215 Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses Accident Year 2015 $ 19 $ 110 $ 230 $ 357 $ 446 $ 501 $ 530 $ 561 $ 573 $ 581 2016 32 163 279 407 481 524 582 620 652 2017 23 118 250 399 471 553 606 657 2018 33 107 228 307 428 491 546 2019 25 98 181 322 455 532 2020 23 99 192 280 367 2021 26 140 262 391 2022 29 123 260 2023 33 153 2024 34 Total $ 4,173 Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented $ 4,123 Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2015 171 Liability for unallocated claim adjustment expenses for accident years presented 62 Total net liability for unpaid claim and claim adjustment expenses $ 4,356 Net Strengthening (Releases) of Prior Accident Year Reserves Years Ended December 31 Total Accident Year 2015 $ (5) $ (2) $ 15 $ 11 $ 2 $ 15 $ 8 $ 14 $ 17 $ 75 2016 36 8 4 2 10 1 20 8 89 2017 — — 2 (4) 22 38 23 81 2018 (9) 2 (7) 11 29 (14) 12 2019 2 — 9 29 7 47 2020 (1) 4 10 (34) (21) 2021 2 9 21 32 2022 (1) 2 1 2023 35 35 Total net development for the accident years presented above 57 148 65 Total net development for accident years prior to 2015 10 1 10 Total unallocated claim adjustment expense development — — — Total $ 67 $ 149 $ 75 (a) Data presented for these calendar years is required supplemental information, which is unaudited. Workers’ Compensation Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses December 31, 2024 December 31 2015 (a) 2016 (a) 2017 (a) 2018 (a) 2019 (a) 2020 (a) 2021 (a) 2022 (a) 2023 (a) 2024 IBNR Cumulative Number of Claims (In millions, except reported claims data) Accident Year 2015 $ 422 $ 431 $ 406 $ 408 $ 394 $ 382 $ 372 $ 353 $ 334 $ 324 $ 45 31,916 2016 426 405 396 382 366 355 331 308 293 45 32,000 2017 440 432 421 400 402 399 398 383 65 33,156 2018 450 440 428 415 415 404 399 65 34,914 2019 452 449 437 436 419 416 67 34,377 2020 477 466 446 414 393 107 29,481 2021 468 454 432 421 116 30,126 2022 497 489 478 148 33,428 2023 555 551 233 36,822 2024 574 325 34,332 Total $ 4,232 $ 1,216 Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses Accident Year 2015 $ 51 $ 131 $ 180 $ 212 $ 231 $ 243 $ 251 $ 256 $ 259 $ 261 2016 53 129 169 198 219 227 234 235 238 2017 63 151 207 243 265 279 287 293 2018 68 163 229 259 280 298 307 2019 71 169 223 262 291 310 2020 65 147 200 228 246 2021 67 164 222 256 2022 79 192 258 2023 87 209 2024 111 Total $ 2,489 Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented $ 1,743 Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2015 1,757 Other (b) (22) Liability for unallocated claim adjustment expenses for accident years presented 65 Total net liability for unpaid claim and claim adjustment expenses $ 3,543 Net Strengthening (Releases) of Prior Accident Year Reserves Years Ended December 31 Total Accident Year 2015 $ 9 $ (25) $ 2 $ (14) $ (12) $ (10) $ (19) $ (19) $ (10) $ (98) 2016 (21) (9) (14) (16) (11) (24) (23) (15) (133) 2017 (8) (11) (21) 2 (3) (1) (15) (57) 2018 (10) (12) (13) — (11) (5) (51) 2019 (3) (12) (1) (17) (3) (36) 2020 (11) (20) (32) (21) (84) 2021 (14) (22) (11) (47) 2022 (8) (11) (19) 2023 (4) (4) Total net development for the accident years presented above (81) (133) (95) Adjustment for development on a discounted basis (3) (2) (2) Total net development for accident years prior to 2015 (78) (74) (105) Total unallocated claim adjustment expense development 10 6 — Total $ (152) $ (203) $ (202) (a) Data presented for these calendar years is required supplemental information, which is unaudited. (b) Other includes the effect of discounting lifetime claim reserves.
Schedule of Supplementary Information about Average Historical Claims Duration	The table below presents information about average historical claims duration as of December 31, 2024 and is presented as required supplementary information, which is unaudited. Average Annual Percentage Payout of Ultimate Net Incurred Claim and Allocated Claim Adjustment Expenses in Year: 1 2 3 4 5 6 7 8 9 10 Medical professional liability 3.6 % 16.3 % 21.8 % 16.6 % 12.7 % 8.9 % 5.7 % 3.2 % 1.1 % 1.6 % Other professional liability and management liability 6.5 19.6 19.2 14.7 10.5 6.9 5.6 6.1 2.5 0.6 Surety (a) 17.3 41.0 16.4 8.1 3.9 6.2 (2.3) (0.3) 1.1 — Commercial auto 23.7 22.3 18.4 14.6 10.5 5.1 2.4 0.9 0.5 1.1 General liability 3.4 12.5 15.7 16.8 13.8 9.2 7.1 5.7 3.2 1.2 Workers’ compensation 16.8 23.4 14.2 8.8 5.9 3.8 2.3 1.2 1.0 0.6 (a) Due to the nature of the Surety business, average annual percentage payout of ultimate net incurred claim and allocated claim adjustment expenses has been calculated using only the payouts of mature accident years presented in the loss reserve development tables.
Schedule of Impact of Loss Portfolio Transfer	The following table presents the impact of the Loss Portfolio Transfer on the Consolidated Statements of Operations. Year Ended December 31 2024 2023 2022 (In millions) Additional amounts ceded under LPT: Net A&EP adverse development before consideration of LPT $ 103 $ 86 $ 92 Provision for uncollectible third-party reinsurance on A&EP (5) Total additional amounts ceded under LPT 103 86 87 Retroactive reinsurance benefit recognized (95) (94) (91) Pretax impact of deferred retroactive reinsurance $ 8 $ (8) $ (4)

Future Policy Benefits Reserv_2

Future Policy Benefits Reserves (Tables)	12 Months Ended
	Dec. 31, 2024
Insurance [Abstract]
Schedule of Liability for Future Policy Benefit	The following table summarizes balances and changes in the LFPB. 2024 2023 2022 (In millions) Present value of future net premiums Balance, January 1 $ 3,710 $ 3,991 $ 4,735 Effect of changes in discount rate (125) (74) (880) Balance, January 1, at original locked in discount rate 3,585 3,917 3,855 Effect of changes in cash flow assumptions (a) 111 28 352 Effect of actual variances from expected experience (a) (41) (126) (49) Adjusted balance, January 1 3,655 3,819 4,158 Interest accrual 183 202 216 Net premiums: earned during period (420) (436) (457) Balance, end of period at original locked in discount rate 3,418 3,585 3,917 Effect of changes in discount rate 7 125 74 Balance, December 31 $ 3,425 $ 3,710 $ 3,991 Present value of future benefits & expenses Balance, January 1 $ 17,669 $ 17,471 $ 22,745 Effect of changes in discount rate (578) (125) (5,942) Balance, January 1, at original locked in discount rate 17,091 17,346 16,803 Effect of changes in cash flow assumptions (a) 126 36 538 Effect of actual variances from expected experience (a) 69 (46) (21) Adjusted balance, January 1 17,286 17,336 17,320 Interest accrual 924 962 979 Benefit & expense payments (1,187) (1,207) (953) Balance, end of period at original locked in discount rate 17,023 17,091 17,346 Effect of changes in discount rate (440) 578 125 Balance, December 31 $ 16,583 $ 17,669 $ 17,471 Net LFPB, December 31 $ 13,158 $ 13,959 $ 13,480 (a) As of December 31, 2024, 2023 and 2022 the re-measurement loss of $(125), $(88) and $(214) presented parenthetically on the Consolidated 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 Consolidated Statement of Operations. Year Ended December 31 2024 2023 2022 (In millions) Earned premiums $ 437 $ 451 $ 473 Interest expense 741 760 763 The following table presents undiscounted expected future benefit and expense payments and undiscounted expected future gross premiums. December 31, 2024 2023 (In millions) Expected future benefit and expense payments $ 31,712 $ 32,851 Expected future gross premiums 5,183 5,414 The weighted average interest rates in the table below are calculated based on the rate used to discount all future cash flows. December 31, 2024 2023 Original locked in discount rate 5.20 % 5.22 % Upper-medium grade fixed income instrument discount rate 5.51 4.94

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2024
Leases [Abstract]
Schedule of Maturities of Lease Liabilities	The table below presents the maturities of lease liabilities: Operating As of December 31, 2024 Leases (In millions) 2025 $ 64 2026 55 2027 53 2028 48 2029 49 Thereafter 291 Total 560 Less: discount 154 Total lease liabilities $ 406
Schedule of Weighted Average Remaining Lease Term for Operating Leases and Weighted Average Discount Rate	The table below presents the weighted average remaining lease term for operating leases and weighted average discount rate used in calculating the operating lease asset and liability. As of December 31, 2024 Weighted average remaining lease term 10.5 years Weighted average discount rate 3.9 %

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2024
Income Tax Disclosure [Abstract]
Schedule of Current and Deferred Components of Income Tax Expense	The current and deferred components of income tax expense are as follows: Year Ended December 31 2024 2023 2022 (In millions) Income tax expense (benefit): Federal: Current $ 320 $ 267 $ 241 Deferred (10) 81 (60) State and city: Current 47 20 25 Deferred (40) 31 15 Foreign 63 52 2 Total $ 380 $ 451 $ 223
Schedule of Reconciliation between Federal Income Tax Expense at Statutory Rates and Actual Income Tax Expense	The components of U.S. and foreign income before income tax and a reconciliation between the federal income tax expense at statutory rates and the actual income tax expense is as follows: Year Ended December 31 2024 2023 2022 (In millions) Income before income tax: U.S. $ 1,672 $ 1,798 $ 973 Foreign 202 198 141 Total $ 1,874 $ 1,996 $ 1,114 Income tax expense at statutory rate $ 393 $ 419 $ 235 Increase (decrease) in income tax expense resulting from: Exempt investment income (22) (28) (38) Foreign related tax differential (5) 1 (15) Valuation allowance 1 2 1 State taxes 8 48 36 Other 5 9 4 Income tax expense $ 380 $ 451 $ 223
Schedule of Deferred Tax Assets and Liabilities	The following table summarizes deferred tax assets and liabilities: December 31 2024 2023 (In millions) Deferred tax assets: Insurance reserves: Property and casualty claim and claim adjustment expense reserves $ 234 $ 202 Unearned premium reserves 225 213 Policyholder reserves 160 Deferred revenue 85 70 Employee benefits 79 86 Deferred retroactive reinsurance benefit 89 88 Net operating loss carryforwards 35 44 Net unrealized losses 485 416 Other 153 159 Total deferred tax assets 1,385 1,438 Valuation allowance (19) (18) Net deferred tax assets 1,366 1,420 Deferred tax liabilities: Deferred acquisition costs (140) (126) Policyholder reserves (48) Property, plant and equipment (963) (938) Basis differential in investment in subsidiary (481) (502) Other liabilities (245) (198) Total deferred tax liabilities (1,877) (1,764) Net deferred tax liabilities (a) $ (511) $ (344) (a) Includes deferred tax assets reflected in Other assets on the Consolidated Balance Sheets at December 31, 2024 and 2023 $ 39 $ 54

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2024
Debt Disclosure [Abstract]
Schedule of Debt	December 31 2024 2023 (In millions) Loews Corporation (Parent Company): Senior: 3.8% notes due 2026 (effective interest rate of 3.9%) (authorized, $500) $ 500 $ 500 3.2% notes due 2030 (effective interest rate of 3.3%) (authorized, $500) 500 500 6.0% notes due 2035 (effective interest rate of 6.2%) (authorized, $300) 300 300 4.1% notes due 2043 (effective interest rate of 4.3%) (authorized, $500) 500 500 CNA Financial: Senior: 4.0% notes due 2024 (effective interest rate of 4.0%) (authorized, $550) 550 4.5% notes due 2026 (effective interest rate of 4.5%) (authorized, $500) 500 500 3.5% notes due 2027 (effective interest rate of 3.5%) (authorized, $500) 500 500 3.9% notes due 2029 (effective interest rate of 3.9%) (authorized, $500) 500 500 2.1% notes due 2030 (effective interest rate of 2.1%) (authorized, $500) 500 500 5.5% notes due 2033 (effective interest rate of 5.7%) (authorized, $500) 500 500 5.1% notes due 2034 (effective interest rate of 5.3%) (authorized, $500) 500 Boardwalk Pipelines: Senior: Variable rate revolving credit facility due 2028 (effective interest rate of 6.7%) 25 5.0% notes due 2024 (effective interest rate of 5.2%) (authorized, $600) 600 6.0% notes due 2026 (effective interest rate of 6.2%) (authorized, $550) 550 550 4.5% notes due 2027 (effective interest rate of 4.6%) (authorized, $500) 500 500 7.3% debentures due 2027 (effective interest rate of 8.1%) (authorized, $100) 100 100 4.8% notes due 2029 (effective interest rate of 4.9%) (authorized, $500) 500 500 3.4% notes due 2031 (effective interest rate of 3.5%) (authorized, $500) 500 500 3.6% notes due 2032 (effective interest rate of 3.7%) (authorized, $500) 500 500 5.6% notes due 2034 (effective interest rate of 5.8%) (authorized, $600) 600 Finance lease obligation 4 5 Loews Hotels & Co: Senior debt, principally mortgages (effective interest rates approximate 6.7% and 6.8%) 1,011 933 9,065 9,063 Less unamortized discount and issuance costs 70 60 Less intercompany eliminations 51 Debt $ 8,944 $ 9,003
Summary of Long-term Debt	December 31, 2024 Principal Unamortized Discount and Issuance Costs Net Short Term Debt Long Term Debt (In millions) Loews Corporation $ 1,800 $ 15 $ 1,785 $ 1,785 CNA Financial 3,000 27 2,973 2,973 Boardwalk Pipelines 3,254 19 3,235 $ 1 3,234 Loews Hotels & Co 1,011 9 1,002 4 998 Less intercompany eliminations 51 51 51 Total $ 9,014 $ 70 $ 8,944 $ 5 $ 8,939

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2024
Equity [Abstract]
Schedule of Changes in AOCI by Component	The tables below present the changes in AOCI by component for the years ended December 31, 2022, 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, 2022, as reported $ (2) $ 930 $ — $ (6) $ (636) $ (100) $ 186 Cumulative effect adjustments from changes in accounting standards (Note 1), after tax of $0, $(617), $1,063, $0, $0 and $0 2,079 (3,585) (1,506) Balance, January 1, 2022, as adjusted (2) 3,009 (3,585) (6) (636) (100) (1,320) Other comprehensive income (loss) before reclassifications, after tax of $0, $1,643, $(1,052), $(7), $1 and $0 (6,223) 3,959 20 (3) (111) (2,358) Reclassification of (gains) losses from accumulated other comprehensive loss, after tax of $1, $(21), $0, $0, $(5) and $0 (5) 126 18 139 Other comprehensive income (loss) (5) (6,097) 3,959 20 15 (111) (2,219) Amounts attributable to noncontrolling interests 619 (410) (1) 11 219 Balance, December 31, 2022 $ (7) $ (2,469) $ (36) $ 14 $ (622) $ (200) $ (3,320) Other comprehensive income (loss) before reclassifications, after tax of $6, $(290), $85, $2, $(10) and $0 (24) 1,072 (318) (5) 41 60 826 Reclassification of (gains) losses from accumulated other comprehensive loss, after tax of $(5), $(14), $0, $0, $(18) and $0 19 53 63 135 Other comprehensive income (loss) (5) 1,125 (318) (5) 104 60 961 Amounts attributable to noncontrolling interests (93) 26 (5) (5) (77) Purchase of CNA shares (46) (1) (10) (4) (61) Balance, December 31, 2023 $ (12) $ (1,483) $ (329) $ 9 $ (533) $ (149) $ (2,497) Other comprehensive income (loss) before reclassifications, after tax of $9, $81, $(189), $(1), $(6) and $1 (34) (309) 712 22 (102) 289 Reclassification of losses from accumulated other comprehensive loss, after tax of $(9), $(13), $0, $0, $(86) and $0 33 47 318 398 Other comprehensive income (loss) (1) (262) 712 — 340 (102) 687 Amounts attributable to noncontrolling interests 22 (59) (28) 8 (57) Other 3 (3) — Balance, December 31, 2024 $ (13) $ (1,720) $ 324 $ 9 $ (224) $ (243) $ (1,867)
Schedule of Amount Reclassification From AOCI	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)	12 Months Ended
	Dec. 31, 2024
Revenue from Contract with Customer [Abstract]
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 20: Year Ended December 31 2024 2023 2022 (In millions) Non-insurance warranty – CNA Financial $ 1,609 $ 1,624 $ 1,574 Transportation and storage of natural gas and NGLs and ethane supply and transportation services – Boardwalk Pipelines $ 1,987 $ 1,582 $ 1,398 Lodging and related services – Loews Hotels & Co 906 778 689 Total revenues from contracts with customers 2,893 2,360 2,087 Other revenues 98 95 113 Operating revenues and other $ 2,991 $ 2,455 $ 2,200

Statutory Accounting Practices

Statutory Accounting Practices (Tables)	12 Months Ended
	Dec. 31, 2024
Statutory Accounting Practices [Abstract]
Schedule of Statutory Capital and Surplus and Statutory Net Income	Combined statutory capital and surplus and statutory net income for the Combined Continental Casualty Companies are presented in the table below, determined in accordance with accounting practices prescribed or permitted by insurance and/or other regulatory authorities. Statutory Capital and Surplus Statutory Net Income December 31 Year Ended December 31 2024 (a) 2023 2024(a)(b) 2023 2022 (In millions) Combined Continental Casualty Companies $11,165 $10,946 $713 $1,172 $1,072 (a) Information derived from the statutory-basis financial statements to be filed with insurance regulators. (b) Includes a $293 million after-tax loss from pension settlement transactions. Pension settlement transactions are further discussed in Note 16.

Benefit Plans (Tables)

Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2024
Retirement Benefits [Abstract]
Schedule of Weighted-Average Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Cost	Weighted average assumptions used to determine benefit obligations: Pension Benefits Other Postretirement Benefits December 31 2024 2023 2022 2024 2023 2022 Discount rate 5.4 % 5.0 % 5.2 % 5.5 % 5.1 % 5.4 % Interest crediting rate 4.3 % 4.5 % 3.4 % Rate of compensation increase 0.0% to 4.5% 0.0% to 3.5% 0.0% to 4.5% Weighted average assumptions used to determine net periodic benefit cost: Pension Benefits Other Postretirement Benefits Year Ended December 31 2024 2023 2022 2024 2023 2022 Discount rate 5.0 % 5.2 % 3.4 % 5.1 % 5.4 % 2.6 % Expected long-term rate of return on plan assets 6.1 % 6.2 % 6.3 % 3.3 % 3.0 % 2.0 % Interest crediting rate 4.5 % 3.5 % 3.0 % Rate of compensation increase 0.0% to 3.5% 0.0% to 3.8% 0.0% to 3.0%
Schedule of Assumed Health Care Cost Trend Rates	Assumed health care cost trend rates: December 31 2024 2023 2022 Health care cost trend rate assumed for next year 4.0% to 8.0% 4.0% to 7.0% 4.0% to 6.5% Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) 4.0% to 5.5% 4.0% to 5.5% 4.0% to 5.5% Year that the rate reaches the ultimate trend rate 2025-2029 2024-2028 2023-2026
Schedule of Net Periodic (Benefit) Cost Components	Net periodic (benefit) cost components: Pension Benefits Other Postretirement Benefits Year Ended December 31 2024 2023 2022 2024 2023 2022 (In millions) Service cost $ 2 $ 2 $ 2 Interest cost 96 110 76 $ 2 $ 2 $ 1 Expected return on plan assets (119) (125) (165) (3) (3) (2) Amortization of unrecognized net loss 29 35 32 1 1 Settlements 372 48 5 Net periodic (benefit) cost $ 380 $ 70 $ (50) $ — $ — $ (1)
Schedule of Reconciliation of Benefit Obligations and Plan Assets	The following provides a reconciliation of benefit obligations and plan assets: Pension Benefits Other Postretirement Benefits 2024 2023 2024 2023 (In millions) Change in benefit obligation: Benefit obligation at January 1 $ 1,991 $ 2,220 $ 34 $ 33 Service cost 2 2 Interest cost 96 110 2 2 Plan participants’ contributions 2 3 Actuarial (gain) loss (29) 31 6 Benefits paid from plan assets (149) (181) (7) (10) Settlements (1,052) (194) Foreign exchange (2) 3 Benefit obligation at December 31 $ 857 $ 1,991 $ 31 $ 34 Change in plan assets: Fair value of plan assets at January 1 $ 2,074 $ 2,212 $ 83 $ 81 Actual return on plan assets 120 206 3 5 Company contributions 13 22 2 4 Plan participants' contributions 2 3 Benefits paid from plan assets (149) (181) (7) (10) Settlements (1,052) (188) Foreign exchange (2) 3 Fair value of plan assets at December 31 $ 1,004 $ 2,074 $ 83 $ 83 Funded status $ 147 $ 83 $ 52 $ 49
Schedule of Amounts Recognized in the Consolidated Balance Sheets	Pension Benefits Other Postretirement Benefits 2024 2023 2024 2023 (In millions) Amounts recognized in the Consolidated Balance Sheets consist of: Other assets $ 283 $ 229 $ 61 $ 59 Other liabilities (136) (146) (9) (10) Net amount recognized $ 147 $ 83 $ 52 $ 49 Amounts recognized in Accumulated other comprehensive income (loss), not yet recognized in net periodic (benefit) cost: Prior service credit $ 1 $ 1 Net actuarial loss 241 672 $ 2 $ 3 Net amount recognized $ 242 $ 673 $ 2 $ 3 Information for plans with projected and accumulated benefit obligations in excess of plan assets: Projected benefit obligation $ 136 $ 229 Accumulated benefit obligation 136 143 $ 9 $ 11 Fair value of plan assets — 83
Schedule of Estimated Future Minimum Benefit Payments	The table below presents the estimated future minimum benefit payments at December 31, 2024. Expected future benefit payments Pension Benefits Other Postretirement Benefits (In millions) 2025 $ 86 $ 3 2026 78 3 2027 81 3 2028 79 3 2029 72 2 2030 – 2034 310 10
Schedule of Plan Assets Measured at Fair Value on Recurring Basis	Pension plan assets measured at fair value on a recurring basis are summarized below. December 31, 2024 Level 1 Level 2 Level 3 Total (In millions) Plan assets at fair value: Fixed maturity securities: Corporate and other bonds $ 408 $ 5 $ 413 States, municipalities and political subdivisions 6 6 Asset-backed 113 8 121 Total fixed maturities $ — 527 13 540 Equity securities 44 15 59 Short-term investments 59 59 Fixed income mutual funds 40 40 Other assets 2 2 Total plan assets at fair value $ 143 $ 544 $ 13 $ 700 Plan assets at net asset value: (a) L imited partnerships 304 Total plan assets $ 143 $ 544 $ 13 $ 1,004 December 31, 2023 Level 1 Level 2 Level 3 Total (In millions) Plan assets at fair value: Fixed maturity securities: Corporate and other bonds $ 10 $ 1,041 $ 6 $ 1,057 States, municipalities and political subdivisions 55 55 Asset-backed 233 8 241 Total fixed maturities 10 1,329 14 1,353 Equity securities 154 6 160 Short-term investments 114 114 Fixed income mutual funds 26 26 Other assets 11 11 Total plan assets at fair value $ 304 $ 1,346 $ 14 $ 1,664 Plan assets at net asset value: (a) Equity securities 25 L imited partnerships 385 Total plan assets $ 304 $ 1,346 $ 14 $ 2,074 (a) Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table for these investments are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the statement of financial position. The limited partnership investments held within the plans are recorded at fair value, which represents the plans’ shares of the net asset value of each partnership, as determined by the general partner. Limited partnerships comprising more than 99% and 93% of the carrying value as of December 31, 2024 and 2023 were invested in private debt and equity. Limited partnerships comprising less than 1% and 7% of the carrying value as of December 31, 2024 and 2023 employ hedge fund strategies. Private debt and equity funds cover a broad range of investment strategies including buyout, private credit, growth capital and distressed investing. Hedge fund strategies include both long and short positions in fixed income, equity and derivative instruments. Within hedge fund strategies, approximately 100% were equity related, none pursued a multi-strategy approach and none were focused on distressed investments at December 31, 2024. For a discussion of the valuation methodologies used to measure fixed maturity securities, equities and short-term investments, see Note 4. Other postretirement benefits plan assets measured at fair value on a recurring basis are summarized below. December 31, 2024 Level 1 Level 2 Level 3 Total (In millions) Fixed maturity securities: Corporate and other bonds $ 48 $ 48 States, municipalities and political subdivisions 35 35 Asset-backed 1 1 Total fixed maturities $ — 84 $ — 84 Short-term investments 2 2 Fixed income mutual funds 15 15 Total assets $ 17 $ 84 $ — $ 101 Other liabilities $ 18 $ 18 December 31, 2023 Level 1 Level 2 Level 3 Total (In millions) Fixed maturity securities: Corporate and other bonds $ 67 $ 67 States, municipalities and political subdivisions 39 39 Asset-backed 1 1 Total fixed maturities $ — 107 $ — 107 Short-term investments 13 13 Fixed income mutual funds 2 2 Total $ 15 $ 107 $ — $ 122 Other liabilities $ 39 $ 39

Reinsurance (Tables)

Reinsurance (Tables)	12 Months Ended
	Dec. 31, 2024
Reinsurance Disclosures [Abstract]
Schedule of Receivables from Reinsurers	The following table presents the amounts receivable from reinsurers: December 31 2024 2023 (In millions) Reinsurance receivables related to insurance reserves: Ceded claim and claim adjustment expenses $ 5,713 $ 5,141 Reinsurance receivables related to paid losses 359 293 Reinsurance receivables 6,072 5,434 Less allowance for doubtful accounts 21 22 Reinsurance receivables, net of allowance for doubtful accounts $ 6,051 $ 5,412
Schedule of Voluntary Reinsurance Receivables by Financial Strength Rating	CNA has established an allowance for doubtful accounts on voluntary reinsurance receivables which relates to both amounts already billed on ceded paid losses as well as ceded reserves that will be billed when losses are paid in the future. The following table summarizes the outstanding amount of voluntary reinsurance receivables, gross of any collateral arrangements, by financial strength rating: As of December 31, 2024 (In millions) A- to A++ $ 4,585 B- to B++ 892 Insolvent 14 Total voluntary reinsurance outstanding balance (a) $ 5,491 (a) Expected credit losses for legacy A&EP receivables are ceded to NICO and the reinsurance limit on the LPT has not been exhausted, therefore no allowance is recorded for these receivables and they are excluded from the table above. See Note 8 for more information on the LPT. Also excluded are receivables from involuntary pools.
Schedule of Effects of Reinsurance on Earned Premiums	The effects of reinsurance on earned premiums are presented in the following table: Assumed/ Direct Assumed Ceded Net Net % (In millions) Year Ended December 31, 2024 Property and casualty $ 14,629 $ 252 $ 5,107 $ 9,774 2.6 % Long-term care 396 41 437 9.4 Earned premiums $ 15,025 $ 293 $ 5,107 $ 10,211 2.9 % Year Ended December 31, 2023 Property and casualty $ 13,908 $ 223 $ 5,102 $ 9,029 2.5 % Long-term care 407 44 451 9.8 Earned premiums $ 14,315 $ 267 $ 5,102 $ 9,480 2.8 % Year Ended December 31, 2022 Property and casualty $ 13,097 $ 231 $ 5,134 $ 8,194 2.8 % Long-term care 427 46 473 9.7 Earned premiums $ 13,524 $ 277 $ 5,134 $ 8,667 3.2 %

Segments (Tables)

Segments (Tables)	12 Months Ended
	Dec. 31, 2024
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	Statements of Operations and Total assets by segment are presented in the following tables. Year Ended December 31, 2024 CNA Financial Boardwalk Pipelines Loews Hotels & Co Corporate Total (In millions) Revenues: Insurance premiums $ 10,211 $ 10,211 Net investment income 2,497 $ 32 $ 9 $ 242 2,780 Investment losses (81) (81) Non-insurance warranty revenue 1,609 1,609 Operating revenues and other 34 2,033 924 2,991 Total 14,270 2,065 933 242 17,510 Expenses: Insurance claims and policyholders’ benefits (a) 7,738 7,738 Amortization of deferred acquisition costs 1,798 1,798 Non-insurance warranty expense 1,547 1,547 Operating expenses and other (b) 1,843 1,377 873 77 4,170 Equity method (income) loss (86) 28 (58) Interest 133 183 51 74 441 Total 13,059 1,560 838 179 15,636 Income before income tax 1,211 505 95 63 1,874 Income tax expense (252) (92) (25) (11) (380) Net income 959 413 70 52 1,494 Amounts attributable to noncontrolling interests (80) (80) Net income attributable to Loews Corporation $ 879 $ 413 $ 70 $ 52 $ 1,414 December 31, 2024 Total assets $ 66,434 $ 9,853 $ 2,498 $ 3,158 $ 81,943 (a) Significant segment expenses within Insurance claims and policyholders' benefits include catastrophe losses of $358 million and unfavorable development of $48 million. Development does not include the effects of interest accretion and change in allowance for uncollectible reinsurance and deductible amounts. (b) Significant segment expenses included in Operating expenses and other: Year Ended December 31, 2024 Insurance related administrative expenses $ 1,275 $ 1,275 Operating expenses $ 633 $ 580 1,213 Depreciation and amortization 429 93 $ 2 524 Other (c) 568 315 200 75 1,158 Operating expenses and other $ 1,843 $ 1,377 $ 873 $ 77 $ 4,170 (c) Other expenses for each reportable segment include: CNA Financial: reflects expenses not directly related to insurance operations, which includes certain expenses related to non-insurance warranty business and claims services offerings, as well as foreign currency transaction gains and losses. For 2024, this also includes a pension settlement charge of $367 million; see Note 16 for more information. Boardwalk Pipelines: general and administrative expenses Loews Hotels & Co: general and administrative, reimbursable and asset impairment expenses Corporate: general and administrative expenses Year Ended December 31, 2023 CNA Boardwalk Pipelines Loews Hotels & Co Corporate Total (In millions) Revenues: Insurance premiums $ 9,480 $ 9,480 Net investment income 2,264 $ 11 $ 6 $ 114 2,395 Investment gains (losses) (99) 46 (53) Non-insurance warranty revenue 1,624 1,624 Operating revenues and other 30 1,625 800 2,455 Total 13,299 1,636 852 114 15,901 Expenses: Insurance claims and policyholders’ benefits (a) 7,068 7,068 Amortization of deferred acquisition costs 1,644 1,644 Non-insurance warranty expense 1,544 1,544 Operating expenses and other (b) 1,398 1,108 767 120 3,393 Equity method (income) loss (129) 9 (120) Interest 127 155 14 80 376 Total 11,781 1,263 652 209 13,905 Income (loss) before income tax 1,518 373 200 (95) 1,996 Income tax (expense) benefit (313) (90) (53) 5 (451) Net income (loss) 1,205 283 147 (90) 1,545 Amounts attributable to noncontrolling interests (111) (111) Net income (loss) attributable to Loews Corporation $ 1,094 $ 283 $ 147 $ (90) $ 1,434 December 31, 2023 Total assets $ 64,655 $ 9,785 $ 2,374 $ 2,383 $ 79,197 (a) Significant segment expenses within Insurance claims and policyholders' benefits include catastrophe losses of $236 million and unfavorable development of $48 million. Development does not include the effects of interest accretion and change in allowance for uncollectible reinsurance and deductible amounts. (b) Significant segment expenses included in Operating expenses and other: Year Ended December 31, 2023 Insurance related administrative expenses $ 1,251 $ 1,251 Operating expenses $ 395 $ 485 880 Depreciation and amortization 412 69 $ 1 482 Other (c) 147 301 213 119 780 Operating expenses and other $ 1,398 $ 1,108 $ 767 $ 120 $ 3,393 (c) Other expenses for each reportable segment include: CNA Financial: reflects expenses not directly related to insurance operations, which includes certain expenses related to non-insurance warranty business and claims services offerings, as well as foreign currency transaction gains and losses. Boardwalk Pipelines: general and administrative expenses Loews Hotels & Co: general and administrative, reimbursable and asset impairment expenses Corporate: general and administrative expenses. For 2023, this also includes a pension settlement charge of $47 million; see Note 16 for additional information. Year Ended December 31, 2022 CNA Boardwalk Pipelines Loews Hotels & Co Corporate Total (In millions) Revenues: Insurance premiums $ 8,667 $ 8,667 Net investment income (loss) 1,805 $ 3 $ 1 $ (7) 1,802 Investment losses (199) (199) Non-insurance warranty revenue 1,574 1,574 Operating revenues and other 32 1,443 720 5 2,200 Total 11,879 1,446 721 (2) 14,044 Expenses: Insurance claims and policyholders’ benefits (a) 6,653 6,653 Amortization of deferred acquisition costs 1,490 1,490 Non-insurance warranty expense 1,471 1,471 Operating expenses and other (b) 1,339 950 697 91 3,077 Equity method (income) loss (148) 9 (139) Interest 112 166 11 89 378 Total 11,065 1,116 560 189 12,930 Income (loss) before income tax 814 330 161 (191) 1,114 Income tax (expense) benefit (133) (83) (44) 37 (223) Net income (loss) 681 247 117 (154) 891 Amounts attributable to noncontrolling interests (69) (69) Net income (loss) attributable to Loews Corporation $ 612 $ 247 $ 117 $ (154) $ 822 (a) Significant segment expenses within Insurance claims and policyholders' benefits include catastrophe losses of $247 million and favorable development of $32 million. Development does not include the effects of interest accretion and change in allowance for uncollectible reinsurance and deductible amounts. (b) Significant segment expenses included in Operating expenses and other: Year Ended December 31, 2022 Insurance related administrative expenses $ 1,160 $ 1,160 Operating expenses $ 274 $ 414 688 Depreciation and amortization 396 64 $ 2 462 Other (c) 179 280 219 89 767 Operating expenses and other $ 1,339 $ 950 $ 697 $ 91 $ 3,077 (c) Other expenses for each reportable segment include: CNA Financial: reflects expenses not directly related to insurance operations, which includes certain expenses related to non-insurance warranty business and claims services offerings, as well as foreign currency transaction gains and losses. Boardwalk Pipelines: general and administrative expenses Loews Hotels & Co: general and administrative, reimbursable and asset impairment expenses Corporate: general and administrative expenses

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Basis of Presentation (Details)	Dec. 31, 2024
CNA
Basis of Presentation [Abstract]
Subsidiary ownership percentage	92%

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Credit Losses (Details)	12 Months Ended
	Dec. 31, 2024
Debt Securities, Available-for-sale, Allowance for Credit Loss [Abstract]
Period of time after interest becomes delinquent that asset is placed on nonaccrual status	90 days

Summary of Significant Accoun_6

Summary of Significant Accounting Policies - Equity Method Investments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Joint Venture Investments [Abstract]
Equity method income	$ 58	$ 120	$ 139
Other Assets
Joint Venture Investments [Abstract]
Investment in joint ventures	$ 937	$ 996

Summary of Significant Accoun_7

Summary of Significant Accounting Policies - Securities Lending Activities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Own-share Lending Arrangement [Abstract]
Initial collateral deposit as a percentage of the fair value of the securities loaned	100%
Securities held as collateral, at fair value	$ 0	$ 0

Summary of Significant Accoun_8

Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Revenue Recognition [Abstract]
Allowance for doubtful accounts for insurance receivables	$ 26	$ 28
Minimum
Revenue Recognition [Abstract]
Coverages to vehicle or consumer goods owners	1 month
Service contract term	1 year
Maximum
Revenue Recognition [Abstract]
Coverages to vehicle or consumer goods owners	10 years
Service contract term	20 years

Summary of Significant Accoun_9

Summary of Significant Accounting Policies - Claim and Claim Adjustment Expense Reserves (Details) - CNA - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Insurance reserves:
Anticipated amounts due from insureds related to losses under deductible policies	$ 1,300	$ 1,200
Interest rate used in determining present value of obligations of structured settlements unfunded by annuities	6.60%	6.40%
Discounted reserves for unfunded structured settlements	$ 444	$ 465
Discounted reserves for unfunded structured settlements, discount amount	535	559
Interest recognized on discounted reserves for unfunded structured settlements	$ 33	$ 34	$ 36
Interest rate used to discount workers' compensation lifetime claim reserves	3.50%	3.50%
Discounted reserves for workers' compensation lifetime claim reserves	$ 179	$ 196
Interest recognized on discounted reserves for workers' compensation lifetime claim reserves	6	9	$ 9
Workers’ compensation
Insurance reserves:
Discounted reserves for workers' compensation lifetime claims reserves, discount amount	$ 80	$ 88

Summary of Significant Accou_10

Summary of Significant Accounting Policies - Insurance-related Assessments (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Insurance-related Assessments [Abstract]
Liability balance for guaranty fund	$ 86	$ 84

Summary of Significant Accou_11

Summary of Significant Accounting Policies - Reinsurance (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Reinsurance Disclosures [Abstract]
Allowance for doubtful accounts	$ 21	$ 22
Billed receivables percentage of total reinsurance receivables	6%

Summary of Significant Accou_12

Summary of Significant Accounting Policies - Policyholder Dividends (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Policyholder Account Balance [Abstract]
Percentage of net written premium	2%	2%	2%

Summary of Significant Accou_13

Summary of Significant Accounting Policies - Property, Plant and Equipment (Details)	Dec. 31, 2024
Pipeline Equipment | Minimum
Property, Plant and Equipment [Abstract]
Principal service lives	30 years
Pipeline Equipment | Maximum
Property, Plant and Equipment [Abstract]
Principal service lives	50 years
Hotel Properties and Other | Minimum
Property, Plant and Equipment [Abstract]
Principal service lives	3 years
Hotel Properties and Other | Maximum
Property, Plant and Equipment [Abstract]
Principal service lives	40 years

Summary of Significant Accou_14

Summary of Significant Accounting Policies - Stock-based Compensation (Details)	12 Months Ended
	Dec. 31, 2024
Accounting Policies [Abstract]
Share-based payment awards requisite service period	3 years

Summary of Significant Accou_15

Summary of Significant Accounting Policies - Net Income per Share (Details) - shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential shares attributable to exercises included in diluted EPS calculation (in shares)	300,000	300,000	400,000
Share-Based Payment Arrangement
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from diluted EPS calculation (in shares)	0	0	0

Summary of Significant Accou_16

Summary of Significant Accounting Policies - Foreign Currency (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Foreign Currency [Abstract]
Foreign currency transaction gain (loss)	$ (7)	$ 8	$ (20)

Summary of Significant Accou_17

Summary of Significant Accounting Policies - Supplementary Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Supplemental Cash Flow Information [Abstract]
Cash payments made for interest on long term debt, net of capitalized interest	$ 422	$ 385	$ 380
Cash payments for federal, foreign, state and local income taxes amount	403	304	376
Accrued capital expenditures	$ 37	$ 9	$ 33

Summary of Significant Accou_18

Summary of Significant Accounting Policies - Recently issued ASUs (Details) - USD ($) $ in Millions	Jan. 01, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Recently issued ASUs
Equity		$ 17,937	$ 16,525	$ 15,201	$ 17,471
Retained Earnings
Recently issued ASUs
Equity		$ 16,459	$ 15,617	$ 14,931	14,754
Cumulative Effect, Period of Adoption, Adjustment
Recently issued ASUs
Equity					(1,704)
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings
Recently issued ASUs
Equity					$ (22)
Cumulative Effect, Period of Adoption, Adjustment | Pro Forma | Retained Earnings
Recently issued ASUs
Equity	$ 5

Acquisitions, Divestitures an_2

Acquisitions, Divestitures and Deconsolidations - Boardwalk Pipelines (Details) - Williams Olefins Pipeline Holdco LLC (“Bayou Ethane”) $ in Millions	Sep. 29, 2023 USD ($)
Business Acquisition [Line Items]
Percentage of voting interests acquired	100%
Payments to acquire businesses	$ 355

Acquisitions, Divestitures an_3

Acquisitions, Divestitures and Deconsolidations - Loews Hotels & Co (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) subsidiary	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Subsidiary, Sale of Stock [Line Items]
Investment gains (losses)	$ (81)	$ (53)	$ (199)
Assets	81,943	79,197
Liabilities	$ 64,006	62,672
Loews Hotels & Co
Subsidiary, Sale of Stock [Line Items]
Number of subsidiaries | subsidiary	2
Payments to acquire additional interest in subsidiaries	$ 44
Proceeds from sale of assets	23
Investment gains (losses)		46
Assets	$ 2,498	2,374
Loews Hotels And Co
Subsidiary, Sale of Stock [Line Items]
Payments to acquire an additional equity interest in joint venture property		46
Loews Hotels And Co | Joint venture
Subsidiary, Sale of Stock [Line Items]
Investment gains (losses)		46
Gain on investments, net of tax		36
Assets		232
Liabilities		$ 120

Investments - Net Investment In

Investments - Net Investment Income (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) Investment	Dec. 31, 2023 USD ($) Investment	Dec. 31, 2022 USD ($)
Net Investment Income [Line Items]
Investment income, operating	$ 2,877	$ 2,489	$ 1,886
Investment expenses	(97)	(94)	(84)
Net investment income	2,780	2,395	1,802
Net investment income recognized due to the change in fair value of equity and trading portfolio securities held	$ 93	$ 38	3
Number of investments in single issuer exceeding 10% | Investment	0	0
Fixed maturity securities
Net Investment Income [Line Items]
Investment income, operating	$ 2,050	$ 1,941	1,787
Limited partnership investments
Net Investment Income [Line Items]
Gain (losses) on investments, before investment expenses	271	177	(6)
Short-term investments
Net Investment Income [Line Items]
Investment income, operating	90	78	17
Equity securities
Net Investment Income [Line Items]
Investment income, operating	82	63	23
Income from trading portfolio
Net Investment Income [Line Items]
Investment income, operating	255	125
Other
Net Investment Income [Line Items]
Investment income, operating	$ 129	$ 105	$ 65

Investments - Investment Gains

Investments - Investment Gains (Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Investment Gains (Losses) [Abstract]
Investment losses	$ (81)	$ (53)	$ (199)
Net gain related to the expected novation of a coinsurance agreement			18
Gain (loss) on fixed maturity securities related to funds with held liability			62
Loss on embedded derivative			44
Nonredeemable Preferred Stock
Investment Gains (Losses) [Abstract]
Investment losses	19	14	(75)
Fixed maturity securities
Investment Gains (Losses) [Abstract]
Gross gains	48	75	120
Gross losses	(150)	(166)	(261)
Investment losses	(102)	(91)	(141)
Equity securities
Investment Gains (Losses) [Abstract]
Investment losses	21	4	(116)
Derivative instruments
Investment Gains (Losses) [Abstract]
Investment losses		(1)	64
Short-term investments and other
Investment Gains (Losses) [Abstract]
Investment losses		(11)	(6)
Joint venture
Investment Gains (Losses) [Abstract]
Investment losses		$ 46

Investments - Available-for-sal

Investments - Available-for-sale Impairment Losses Recognized in Earnings (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Available-For-Sale Impairment Losses [Abstract]
Impairment losses recognized in earnings	$ 63	$ 44	$ 62
Change in unrealized gains on fixed maturity securities	(352)	1,400	(7,900)
Mortgage Loans
Available-For-Sale Impairment Losses [Abstract]
Losses on mortgage loans due to changes in expected credit losses	0	11	8
Corporate bonds and other
Available-For-Sale Impairment Losses [Abstract]
Impairment losses recognized in earnings	34	33	62
Asset-backed
Available-For-Sale Impairment Losses [Abstract]
Impairment losses recognized in earnings	$ 29	$ 11

Investments - Amortized Cost an

Investments - Amortized Cost and Fair Values of Fixed Maturity Securities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]
Cost or Amortized Cost	$ 44,196	$ 42,615
Gross Unrealized Gains	715	1,022
Gross Unrealized Losses	3,039	2,995
Allowance for Credit Losses	45	16
Estimated Fair Value	41,827	40,626
Corporate bonds and other
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]
Cost or Amortized Cost	25,839	25,020
Gross Unrealized Gains	423	597
Gross Unrealized Losses	1,305	1,345
Allowance for Credit Losses	13	4
Estimated Fair Value	24,944	24,268
States, municipalities and political subdivisions
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]
Cost or Amortized Cost	7,396	7,713
Gross Unrealized Gains	243	382
Gross Unrealized Losses	835	703
Allowance for Credit Losses
Estimated Fair Value	6,804	7,392
Residential mortgage-backed
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]
Cost or Amortized Cost	3,725	3,411
Gross Unrealized Gains	7	16
Gross Unrealized Losses	488	425
Allowance for Credit Losses
Estimated Fair Value	3,244	3,002
Commercial mortgage-backed
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]
Cost or Amortized Cost	1,779	1,862
Gross Unrealized Gains	11	7
Gross Unrealized Losses	141	230
Allowance for Credit Losses	18	8
Estimated Fair Value	1,631	1,631
Other asset-backed
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]
Cost or Amortized Cost	3,770	3,515
Gross Unrealized Gains	24	13
Gross Unrealized Losses	239	256
Allowance for Credit Losses	14	4
Estimated Fair Value	3,541	3,268
Asset-backed
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]
Cost or Amortized Cost	9,274	8,788
Gross Unrealized Gains	42	36
Gross Unrealized Losses	868	911
Allowance for Credit Losses	32	12
Estimated Fair Value	8,416	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	220	152
Gross Unrealized Gains	1	1
Gross Unrealized Losses	1	2
Allowance for Credit Losses
Estimated Fair Value	220	151
Foreign government
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]
Cost or Amortized Cost	701	741
Gross Unrealized Gains	6	6
Gross Unrealized Losses	30	34
Allowance for Credit Losses
Estimated Fair Value	677	713
Fixed maturities available-for-sale
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]
Cost or Amortized Cost	43,430	42,414
Gross Unrealized Gains	715	1,022
Gross Unrealized Losses	3,039	2,995
Allowance for Credit Losses	45	16
Estimated Fair Value	41,061	40,425
Fixed maturities trading
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]
Cost or Amortized Cost	766	201
Gross Unrealized Gains
Gross Unrealized Losses
Allowance for Credit Losses
Estimated Fair Value	$ 766	$ 201

Investments - Available-for-s_2

Investments - Available-for-sale Securities in Gross Unrealized Loss Position (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Gross Unrealized Losses [Abstract]
Total, Estimated Fair Value	$ 27,288	$ 25,731
Total, Gross Unrealized Losses	3,039	2,995
Total fixed maturities
Gross Unrealized Losses [Abstract]
Less than 12 Months, Estimated Fair Value	8,969	3,483
Less than 12 Months, Gross Unrealized Losses	266	74
12 Months or Longer, Estimated Fair Value	18,319	22,248
12 Months or Longer, Gross Unrealized Losses	2,773	2,921
Total, Estimated Fair Value	27,288	25,731
Total, Gross Unrealized Losses	3,039	2,995
Corporate bonds and other
Gross Unrealized Losses [Abstract]
Less than 12 Months, Estimated Fair Value	5,846	1,943
Less than 12 Months, Gross Unrealized Losses	165	37
12 Months or Longer, Estimated Fair Value	10,388	13,406
12 Months or Longer, Gross Unrealized Losses	1,140	1,308
Total, Estimated Fair Value	16,234	15,349
Total, Gross Unrealized Losses	1,305	1,345
States, municipalities and political subdivisions
Gross Unrealized Losses [Abstract]
Less than 12 Months, Estimated Fair Value	1,247	598
Less than 12 Months, Gross Unrealized Losses	52	18
12 Months or Longer, Estimated Fair Value	2,967	3,104
12 Months or Longer, Gross Unrealized Losses	783	685
Total, Estimated Fair Value	4,214	3,702
Total, Gross Unrealized Losses	835	703
Residential mortgage-backed
Gross Unrealized Losses [Abstract]
Less than 12 Months, Estimated Fair Value	849	233
Less than 12 Months, Gross Unrealized Losses	22	4
12 Months or Longer, Estimated Fair Value	2,010	2,212
12 Months or Longer, Gross Unrealized Losses	466	421
Total, Estimated Fair Value	2,859	2,445
Total, Gross Unrealized Losses	488	425
Commercial mortgage-backed
Gross Unrealized Losses [Abstract]
Less than 12 Months, Estimated Fair Value	180	200
Less than 12 Months, Gross Unrealized Losses	2	5
12 Months or Longer, Estimated Fair Value	988	1,184
12 Months or Longer, Gross Unrealized Losses	139	225
Total, Estimated Fair Value	1,168	1,384
Total, Gross Unrealized Losses	141	230
Other asset-backed
Gross Unrealized Losses [Abstract]
Less than 12 Months, Estimated Fair Value	680	392
Less than 12 Months, Gross Unrealized Losses	21	8
12 Months or Longer, Estimated Fair Value	1,557	1,869
12 Months or Longer, Gross Unrealized Losses	218	248
Total, Estimated Fair Value	2,237	2,261
Total, Gross Unrealized Losses	239	256
Total asset-backed
Gross Unrealized Losses [Abstract]
Less than 12 Months, Estimated Fair Value	1,709	825
Less than 12 Months, Gross Unrealized Losses	45	17
12 Months or Longer, Estimated Fair Value	4,555	5,265
12 Months or Longer, Gross Unrealized Losses	823	894
Total, Estimated Fair Value	6,264	6,090
Total, Gross Unrealized Losses	868	911
U.S. Treasury and obligations of government-sponsored enterprises
Gross Unrealized Losses [Abstract]
Less than 12 Months, Estimated Fair Value	49	65
Less than 12 Months, Gross Unrealized Losses	1	1
12 Months or Longer, Estimated Fair Value	41	23
12 Months or Longer, Gross Unrealized Losses		1
Total, Estimated Fair Value	90	88
Total, Gross Unrealized Losses	1	2
Foreign government
Gross Unrealized Losses [Abstract]
Less than 12 Months, Estimated Fair Value	118	52
Less than 12 Months, Gross Unrealized Losses	3	1
12 Months or Longer, Estimated Fair Value	368	450
12 Months or Longer, Gross Unrealized Losses	27	33
Total, Estimated Fair Value	486	502
Total, Gross Unrealized Losses	$ 30	$ 34

Investments - Schedule of Unrea

Investments - Schedule of Unrealized Loss (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	$ 27,288	$ 25,731
Gross Unrealized Losses	3,039	2,995
Additional impairment losses	0
AAA
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	1,800	1,524
Gross Unrealized Losses	282	261
AA
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	4,247	3,817
Gross Unrealized Losses	730	658
A
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	6,330	5,652
Gross Unrealized Losses	582	517
BBB
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	11,548	11,523
Gross Unrealized Losses	980	1,095
U.S. Government, Government agencies and Government-sponsored enterprises
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	2,567	2,273
Gross Unrealized Losses	373	309
Non-investment grade
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	796	942
Gross Unrealized Losses	$ 92	$ 155

Investments - Allowance for Cre

Investments - Allowance for Credit Losses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Receivables	Receivables
Accrued interest receivables on available-for-sale fixed maturity securities	$ 442	$ 435
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Beginning balance	16	1
Securities for which credit losses were not previously recorded	27	17
Available-for-sale securities accounted for as PCD assets	4	22
Securities sold during the period (realized)	4	6
Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis	1	8
Write-offs charged against the allowance	9	15
Additional increases to the allowance for credit losses on securities that had an allowance recorded in a previous period	12	5
Ending balance	45	16
Corporate bonds and other
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Beginning balance	4	0
Securities for which credit losses were not previously recorded	9	10
Available-for-sale securities accounted for as PCD assets	4	22
Securities sold during the period (realized)	3	6
Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis	1	8
Write-offs charged against the allowance		15
Additional increases to the allowance for credit losses on securities that had an allowance recorded in a previous period		1
Ending balance	13	4
Asset-backed
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Beginning balance	12	1
Securities for which credit losses were not previously recorded	18	7
Available-for-sale securities accounted for as PCD assets
Securities sold during the period (realized)	1
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	9
Additional increases to the allowance for credit losses on securities that had an allowance recorded in a previous period	12	4
Ending balance	$ 32	$ 12

Investments - Available-for-s_3

Investments - Available-for-sale Fixed Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Cost or Amortized Cost
Cost or Amortized Cost	$ 44,196	$ 42,615
Estimated Fair Value
Estimated Fair Value	41,827	40,626
Available-for-sale Fixed Maturities
Cost or Amortized Cost
Due in one year or less	1,761	1,121
Due after one year through five years	11,678	11,563
Due after five years through ten years	13,083	13,359
Due after ten years	16,908	16,371
Cost or Amortized Cost	43,430	42,414
Estimated Fair Value
Due in one year or less	1,753	1,091
Due after one year through five years	11,403	11,180
Due after five years through ten years	12,365	12,573
Due after ten years	15,540	15,581
Estimated Fair Value	$ 41,061	$ 40,425

Investments - Limited Partnersh

Investments - Limited Partnerships (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) Position	Dec. 31, 2023 USD ($) Position	Dec. 31, 2022
Limited Partners' Capital Account, Value [Abstract]
Limited partnership investments	$ 2,520	$ 2,174
Net undistributed earnings of limited partnerships	$ 334	$ 250
Percentage of carrying value of investments in limited partnerships reported on current basis	14%
Percentage of carrying value of investments in limited partnerships reported on one month lag	3%
Threshold for number of largest limited partnership positions held | Position	10	10
Carrying value of limited partnerships as a percentage of aggregate partnership equity	1%	1%
Income from limited partnerships as a percentage of changes in aggregate partnership equity	1%	1%	2%
Advance written notice period for hedge fund withdrawals	90 days
Minimum
Limited Partners' Capital Account, Value [Abstract]
Liquidity period under hedge fund withdrawal provisions	30 days
Maximum
Limited Partners' Capital Account, Value [Abstract]
Liquidity period under hedge fund withdrawal provisions	1 year
Private Debt and Equity
Limited Partners' Capital Account, Value [Abstract]
Percentage of carrying value of investments in limited partnerships	86%	85%
Hedge Funds
Limited Partners' Capital Account, Value [Abstract]
Percentage of carrying value of investments in limited partnerships	14%	15%
Ten Largest Limited Partnership Holdings
Limited Partners' Capital Account, Value [Abstract]
Limited partnership investments	$ 648	$ 622

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	Dec. 31, 2024 USD ($)
Credit Quality Information [Abstract]
2024	$ 102
2023	127
2022	236
2021	76
2020	133
Prior	380
Total	1,054
DSCR Greater than or Equal to 1.6x, LTV Less than 55%
Credit Quality Information [Abstract]
2024
2023	34
2022	9
2021
2020	60
Prior	169
Total	272
DSCR Greater than or Equal to 1.6x, LTV 55% to 65%
Credit Quality Information [Abstract]
2024
2023
2022	15
2021	11
2020	4
Prior	12
Total	42
DSCR Greater than or Equal to 1.6x, LTV Greater than 65%
Credit Quality Information [Abstract]
2024
2023	13
2022	30
2021	12
2020
Prior
Total	55
DSCR Between 1.2 to 1.6x, LTV Less than 55%
Credit Quality Information [Abstract]
2024	49
2023	28
2022	5
2021	2
2020	49
Prior	71
Total	204
DSCR Between 1.2 to 1.6x, LTV 55% to 65%
Credit Quality Information [Abstract]
2024	53
2023	30
2022	21
2021	30
2020	20
Prior	39
Total	193
DSCR Between 1.2 to 1.6x, LTV Greater than 65%
Credit Quality Information [Abstract]
2024
2023
2022	46
2021
2020
Prior
Total	46
DSCR Less than or Equal to 1.2x, LTV Less than 55%
Credit Quality Information [Abstract]
2024
2023
2022
2021
2020
Prior	21
Total	21
DSCR Three, LTV 55 to 65%
Credit Quality Information [Abstract]
2024
2023	22
2022	75
2021
2020
Prior	20
Total	117
DSCR Less than or Equal to 1.2x, LTV Greater than 65%
Credit Quality Information [Abstract]
2024
2023
2022	35
2021	21
2020
Prior	48
Total	$ 104

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	Dec. 31, 2024	Dec. 31, 2023
Futures | Options - purchased
Gross Estimated Fair Values of Derivative Positions [Abstract]
Contractual/Notional Amount	$ 268	$ 202
Estimated Fair Value, Asset	2	1
Estimated Fair Value, Liability
Futures | Futures - short
Gross Estimated Fair Values of Derivative Positions [Abstract]
Contractual/Notional Amount	167	116
Estimated Fair Value, Asset	1
Estimated Fair Value, Liability
Warrants
Gross Estimated Fair Values of Derivative Positions [Abstract]
Contractual/Notional Amount	1	84
Estimated Fair Value, Asset	1	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	4	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)
Credit default swap index - purchased
Gross Estimated Fair Values of Derivative Positions [Abstract]
Contractual/Notional Amount	2,000
Estimated Fair Value, Asset
Estimated Fair Value, Liability

Investments - Narrative (Detail

Investments - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Net investment income	$ 2,780	$ 2,395	$ 1,802
Net gain related to the expected novation of a coinsurance agreement			$ 18
Without hedge designation | Credit default swap index - purchased
Derivative [Line Items]
Notional amount	2,000
Derivative liability	1
Net investment income	$ 1

Investments - Investment Commit

Investments - Investment Commitments (Details) - Investments in Assets Requiring Future Purchase, Sale or Funding Commitments $ in Millions	Dec. 31, 2024 USD ($)
Investment Commitments [Abstract]
Commitments to purchase or fund investments	$ 1,700
Commitments to sell investments	$ 30

Investments - Investments on De

Investments - Investments on Deposit (Details) - USD ($) $ in Billions	Dec. 31, 2024	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Securities deposited by insurance subsidiaries under requirements of regulatory authorities and others	$ 3.1	$ 3.1
Cash and securities deposited with financial institutions in trust accounts or as collateral for letters of credit to secure obligations	$ 0.7	$ 0.9

Fair Value - Assets and Liabili

Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Assets and Liabilities Measured at Fair Value [Abstract]
Estimated Fair Value	$ 41,827	$ 40,626
Corporate bonds and other
Assets and Liabilities Measured at Fair Value [Abstract]
Estimated Fair Value	24,944	24,268
States, municipalities and political subdivisions
Assets and Liabilities Measured at Fair Value [Abstract]
Estimated Fair Value	6,804	7,392
Asset-backed
Assets and Liabilities Measured at Fair Value [Abstract]
Estimated Fair Value	8,416	7,901
Fair Value, Recurring
Assets and Liabilities Measured at Fair Value [Abstract]
Estimated Fair Value	41,061	40,425
Fixed maturities trading	766	201
Total fixed maturities	41,827	40,626
Equity securities	1,064	1,050
Short-term and other	4,453	4,247
Receivables	5	13
Payable to brokers	(88)	(62)
Fair Value, Recurring | Corporate bonds and other
Assets and Liabilities Measured at Fair Value [Abstract]
Estimated Fair Value	25,841	25,132
Fair Value, Recurring | States, municipalities and political subdivisions
Assets and Liabilities Measured at Fair Value [Abstract]
Estimated Fair Value	6,804	7,392
Fair Value, Recurring | Asset-backed
Assets and Liabilities Measured at Fair Value [Abstract]
Estimated Fair Value	8,416	7,901
Fair Value, Recurring | Level 1
Assets and Liabilities Measured at Fair Value [Abstract]
Estimated Fair Value	223	161
Fixed maturities trading	766	201
Total fixed maturities	989	362
Equity securities	603	586
Short-term and other	4,383	4,215
Receivables
Payable to brokers	(88)	(62)
Fair Value, Recurring | Level 1 | Corporate bonds and other
Assets and Liabilities Measured at Fair Value [Abstract]
Estimated Fair Value	223	161
Fair Value, Recurring | Level 1 | States, municipalities and political subdivisions
Assets and Liabilities Measured at Fair Value [Abstract]
Estimated Fair Value
Fair Value, Recurring | Level 1 | Asset-backed
Assets and Liabilities Measured at Fair Value [Abstract]
Estimated Fair Value
Fair Value, Recurring | Level 2
Assets and Liabilities Measured at Fair Value [Abstract]
Estimated Fair Value	38,642	38,274
Fixed maturities trading
Total fixed maturities	38,642	38,274
Equity securities	441	440
Short-term and other	70	32
Receivables	5	13
Payable to brokers
Fair Value, Recurring | Level 2 | Corporate bonds and other
Assets and Liabilities Measured at Fair Value [Abstract]
Estimated Fair Value	24,340	23,926
Fair Value, Recurring | Level 2 | States, municipalities and political subdivisions
Assets and Liabilities Measured at Fair Value [Abstract]
Estimated Fair Value	6,762	7,348
Fair Value, Recurring | Level 2 | Asset-backed
Assets and Liabilities Measured at Fair Value [Abstract]
Estimated Fair Value	7,540	7,000
Fair Value, Recurring | Level 3
Assets and Liabilities Measured at Fair Value [Abstract]
Estimated Fair Value	2,196	1,990
Fixed maturities trading
Total fixed maturities	2,196	1,990
Equity securities	20	24
Short-term and other
Receivables
Payable to brokers
Fair Value, Recurring | Level 3 | Corporate bonds and other
Assets and Liabilities Measured at Fair Value [Abstract]
Estimated Fair Value	1,278	1,045
Fair Value, Recurring | Level 3 | States, municipalities and political subdivisions
Assets and Liabilities Measured at Fair Value [Abstract]
Estimated Fair Value	42	44
Fair Value, Recurring | Level 3 | Asset-backed
Assets and Liabilities Measured at Fair Value [Abstract]
Estimated Fair Value	$ 876	$ 901

Fair Value - Reconciliations of

Fair Value - Reconciliations of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Corporate bonds and other
Reconciliations for All Assets and Liabilities [Roll Forward]
Balance at beginning of period	$ 1,045	$ 810
Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses) Included in Net Income	(1)
Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses) Included in Net Income Included in OCI	(15)	38
Purchases	352	219
Sales	(10)
Settlements	(104)	(33)
Transfers into Level 3	11	11
Transfers out of Level 3
Balance at end of period	1,278	1,045
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at December 31	(1)
Unrealized Gains (Losses) Recognized in Other Comprehensive Income (Loss) on Level 3 Assets and Liabilities Held at December 31	(21)	38
States, municipalities and political subdivisions
Reconciliations for All Assets and Liabilities [Roll Forward]
Balance at beginning of period	44	43
Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses) Included in Net Income
Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses) Included in Net Income Included in OCI	(2)	1
Purchases
Sales
Settlements
Transfers into Level 3
Transfers out of Level 3
Balance at end of period	42	44
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at December 31
Unrealized Gains (Losses) Recognized in Other Comprehensive Income (Loss) on Level 3 Assets and Liabilities Held at December 31	(2)	1
Asset-backed
Reconciliations for All Assets and Liabilities [Roll Forward]
Balance at beginning of period	901	788
Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses) Included in Net Income	9	16
Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses) Included in Net Income Included in OCI	(12)	9
Purchases	125	248
Sales	(14)
Settlements	(83)	(64)
Transfers into Level 3		23
Transfers out of Level 3	(50)	(119)
Balance at end of period	876	901
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at December 31
Unrealized Gains (Losses) Recognized in Other Comprehensive Income (Loss) on Level 3 Assets and Liabilities Held at December 31	(12)	9
Fixed maturities available-for-sale
Reconciliations for All Assets and Liabilities [Roll Forward]
Balance at beginning of period	1,990	1,641
Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses) Included in Net Income	8	16
Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses) Included in Net Income Included in OCI	(29)	48
Purchases	477	467
Sales	(24)	0
Settlements	(187)	(97)
Transfers into Level 3	11	34
Transfers out of Level 3	(50)	(119)
Balance at end of period	2,196	1,990
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at December 31	(1)	0
Unrealized Gains (Losses) Recognized in Other Comprehensive Income (Loss) on Level 3 Assets and Liabilities Held at December 31	(35)	48
Equity securities
Reconciliations for All Assets and Liabilities [Roll Forward]
Balance at beginning of period	24	35
Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses) Included in Net Income	12	(7)
Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses) Included in Net Income Included in OCI
Purchases	3
Sales	(19)	(4)
Settlements
Transfers into Level 3
Transfers out of Level 3
Balance at end of period	20	24
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at December 31	8	(7)
Unrealized Gains (Losses) Recognized in Other Comprehensive Income (Loss) on Level 3 Assets and Liabilities Held at December 31

Fair Value - Significant Unobse

Fair Value - Significant Unobservable Inputs (Details) $ in Millions	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Quantitative Information About the Significant Unobservable Inputs [Abstract]
Estimated Fair Value	$ 41,827	$ 40,626
Level 3 | Fixed maturity securities
Quantitative Information About the Significant Unobservable Inputs [Abstract]
Estimated Fair Value	$ 1,724	$ 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 | Discounted cash flow | Credit spread | Minimum
Quantitative Information About the Significant Unobservable Inputs [Abstract]
Measurement input	0.01	0.01
Level 3 | Fixed maturity securities | Discounted cash flow | Credit spread | Maximum
Quantitative Information About the Significant Unobservable Inputs [Abstract]
Measurement input	0.06	0.07
Level 3 | Fixed maturity securities | Discounted cash flow | Credit spread | Weighted Average
Quantitative Information About the Significant Unobservable Inputs [Abstract]
Measurement input	0.02	0.02

Fair Value - Financial Assets a

Fair Value - Financial Assets and Liabilities Not Measured at Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Carrying Amount
Assets:
Other invested assets, primarily mortgage loans	$ 1,019	$ 1,035
Liabilities:
Short-term debt	4	1,083
Long-term debt	8,936	7,915
Estimated Fair Value
Assets:
Other invested assets, primarily mortgage loans	987	997
Liabilities:
Short-term debt	5	1,066
Long-term debt	8,668	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		546
Long-term debt	7,702	7,255
Estimated Fair Value | Level 3
Assets:
Other invested assets, primarily mortgage loans	987	997
Liabilities:
Short-term debt	5	520
Long-term debt	$ 966	$ 385

Receivables (Details)

Receivables (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Receivables [Abstract]
Reinsurance (Note 17)	$ 6,072	$ 5,434
Insurance	3,697	3,470
Receivable from brokers	50	64
Accrued investment income	458	446
Income taxes	9	21
Other, primarily customer accounts	284	277
Total	10,570	9,712
Less: allowance for doubtful accounts on reinsurance receivables	21	22
Less: allowance for other doubtful accounts	27	30
Receivables	$ 10,522	$ 9,660

Property, Plant and Equipment -

Property, Plant and Equipment - Components of Property, Plant and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Property, plant and equipment	$ 10,738	$ 10,718
Construction in process	247	764
Pipeline Equipment
Property, Plant and Equipment [Abstract]
Property, plant and equipment	8,478	8,421
Accumulated depreciation	4,819	4,470
Hotel Properties
Property, Plant and Equipment [Abstract]
Property, plant and equipment	1,517	1,072
Accumulated depreciation	646	560
Other
Property, Plant and Equipment [Abstract]
Property, plant and equipment	496	461
Accumulated depreciation	$ 578	$ 534

Property, Plant and Equipment_2

Property, Plant and Equipment - Depreciation Expense and Capital Expenditures (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Depreciation	$ 580	$ 534	$ 509
Capital Expend.	585	693	675
Interest costs capitalized	27	32	17
Operating Segments | CNA Financial
Property, Plant and Equipment [Abstract]
Depreciation	59	54	49
Capital Expend.	105	97	50
Operating Segments | Boardwalk Pipelines
Property, Plant and Equipment [Abstract]
Depreciation	426	410	394
Capital Expend.	365	383	352
Operating Segments | Loews Hotels & Co
Property, Plant and Equipment [Abstract]
Depreciation	93	69	64
Capital Expend.	115	201	264
Corporate | Corporate
Property, Plant and Equipment [Abstract]
Depreciation	2	1	2
Capital Expend.		$ 12	$ 9

Property, Plant and Equipment_3

Property, Plant and Equipment - Asset Impairments (Details) - Loews Hotels & Co $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) Property	Dec. 31, 2022 USD ($) Property
Asset Impairments [Abstract]
Number of hotel properties impaired | Property	2	2
Asset impairment charge	$ 12	$ 25
Asset impairment charge, after tax	$ 9	$ 19

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets - Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2024
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 346
Other adjustments	1
Goodwill, ending balance	347
Goodwill	347	$ 347
CNA Financial
Goodwill [Roll Forward]
Goodwill, beginning balance	109
Other adjustments	1
Goodwill, ending balance	110
Goodwill	110	110
Boardwalk Pipelines
Goodwill [Roll Forward]
Goodwill, beginning balance	237
Other adjustments
Goodwill, ending balance	237
Goodwill	$ 237	$ 237

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Finite-lived intangible assets:
Finite-lived intangible assets, gross carrying amount	$ 103	$ 104
Finite-lived intangible assets, accumulated amortization	32	30
Indefinite-lived intangible assets, gross carrying amount	76	77
Total other intangible assets, gross carrying amount	179	181
Total other intangible assets, accumulated amortization	32	30
Amortization Expense [Abstract]
Amortization expense	4	3	$ 3
Estimated amortization expense in 2025	4
Estimated amortization expense in 2026	4
Estimated amortization expense in 2027	4
Estimated amortization expense in 2028	4
Estimated amortization expense in 2029	4
Customer relationships
Finite-lived intangible assets:
Finite-lived intangible assets, gross carrying amount	93	93
Finite-lived intangible assets, accumulated amortization	24	21
Other
Finite-lived intangible assets:
Finite-lived intangible assets, gross carrying amount	10	11
Finite-lived intangible assets, accumulated amortization	$ 8	$ 9

Claim and Claim Adjustment Ex_3

Claim and Claim Adjustment Expense Reserves - Net Liability for Unpaid Claim and Claim Adjustment Expenses (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net Liability for Unpaid Claim and Claim Adjustment Expenses [Abstract]
Net claim and claim adjustment expenses	$ 19,263	$ 18,163	$ 16,929	$ 16,300
Total reinsurance receivables	5,713	5,141	5,191	4,969
Total gross liability for unpaid claims and claims adjustment expenses	24,976	23,304	$ 22,120	$ 21,269
Property and casualty
Net Liability for Unpaid Claim and Claim Adjustment Expenses [Abstract]
Net claim and claim adjustment expenses	18,334	17,213
Total reinsurance receivables	3,348
Other insurance
Net Liability for Unpaid Claim and Claim Adjustment Expenses [Abstract]
Net claim and claim adjustment expenses	929	$ 950
Total reinsurance receivables	$ 2,365

Claim and Claim Adjustment Ex_4

Claim and Claim Adjustment Expense Reserves - Reconciliation of Claim and Claim Adjustment Expense Reserves (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Gross reserves, beginning of year	$ 23,304	$ 22,120	$ 21,269
Ceded reserves, beginning of year	5,141	5,191	4,969
Net reserves, beginning of year	18,163	16,929	16,300
Net incurred claim and claim adjustment expenses:
Provision for insured events of current year	6,330	5,667	5,181
Increase (decrease) in provision for insured events of prior years	42	48	(32)
Amortization of discount	39	44	44
Total net incurred	6,411	5,759	5,193
Net payments attributable to:
Current year events	(1,093)	(922)	(821)
Prior year events	(4,096)	(3,679)	(3,481)
Total net payments	(5,189)	(4,601)	(4,302)
Foreign currency translation adjustment and other	(122)	76	(262)
Net reserves, end of year	19,263	18,163	16,929
Ceded reserves, end of year	5,713	5,141	5,191
Gross reserves, end of year	$ 24,976	$ 23,304	$ 22,120

Claim and Claim Adjustment Ex_5

Claim and Claim Adjustment Expense Reserves - Gross and Net Carried Reserves (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Gross and Net Carried Reserves [Abstract]
Gross Case Reserves	$ 8,402	$ 7,738
Gross IBNR Reserves	16,574	15,566
Total Gross Carried Claim and Claim Adjustment Expense Reserves	24,976	23,304
Net Case Reserves	6,207	5,663
Net IBNR Reserves	13,056	12,500
Total Net Carried Claim and Claim Adjustment Expense Reserves	19,263	18,163	$ 16,929	$ 16,300
Property and casualty
Gross and Net Carried Reserves [Abstract]
Gross Case Reserves	6,589	5,759
Gross IBNR Reserves	15,093	14,184
Total Gross Carried Claim and Claim Adjustment Expense Reserves	21,682	19,943
Net Case Reserves	5,573	4,978
Net IBNR Reserves	12,761	12,235
Total Net Carried Claim and Claim Adjustment Expense Reserves	18,334	17,213
Other insurance operations
Gross and Net Carried Reserves [Abstract]
Gross Case Reserves	1,813	1,979
Gross IBNR Reserves	1,481	1,382
Total Gross Carried Claim and Claim Adjustment Expense Reserves	3,294	3,361
Net Case Reserves	634	685
Net IBNR Reserves	295	265
Total Net Carried Claim and Claim Adjustment Expense Reserves	$ 929	$ 950

Claim and Claim Adjustment Ex_6

Claim and Claim Adjustment Expense Reserves - Net Prior Year Loss Reserve Development in Property and Casualty Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Property and casualty
Net Prior Year Development [Abstract]
Total pretax (favorable) unfavorable development	$ 48	$ 48	$ (32)
Medical professional liability
Net Prior Year Development [Abstract]
Total pretax (favorable) unfavorable development	(8)	5	18
Other professional liability and management liability
Net Prior Year Development [Abstract]
Total pretax (favorable) unfavorable development	49	37	50
Surety
Net Prior Year Development [Abstract]
Total pretax (favorable) unfavorable development	(68)	(43)	(83)
Warranty
Net Prior Year Development [Abstract]
Total pretax (favorable) unfavorable development	20	(11)	(21)
Commercial auto
Net Prior Year Development [Abstract]
Total pretax (favorable) unfavorable development	107	33	49
General liability
Net Prior Year Development [Abstract]
Total pretax (favorable) unfavorable development	75	149	67
Workers’ compensation
Net Prior Year Development [Abstract]
Total pretax (favorable) unfavorable development	(202)	(203)	(152)
Other property and casualty operations
Net Prior Year Development [Abstract]
Total pretax (favorable) unfavorable development	(4)	10	(24)
Other insurance operations
Net Prior Year Development [Abstract]
Total pretax (favorable) unfavorable development	$ 79	$ 71	$ 64

Claim and Claim Adjustment Ex_7

Claim and Claim Adjustment Expense Reserves - Net Liability for Unpaid Claims and Claims Adjustment Expenses by Line of Business (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net Liability for Unpaid Claim and Claim Adjustment Expenses [Abstract]
Net claim and claim adjustment expenses	$ 19,263	$ 18,163	$ 16,929	$ 16,300
Property and casualty
Net Liability for Unpaid Claim and Claim Adjustment Expenses [Abstract]
Net claim and claim adjustment expenses	18,334	$ 17,213
Medical professional liability
Net Liability for Unpaid Claim and Claim Adjustment Expenses [Abstract]
Net claim and claim adjustment expenses	1,425
Other professional liability and management liability
Net Liability for Unpaid Claim and Claim Adjustment Expenses [Abstract]
Net claim and claim adjustment expenses	3,967
Surety
Net Liability for Unpaid Claim and Claim Adjustment Expenses [Abstract]
Net claim and claim adjustment expenses	493
Warranty
Net Liability for Unpaid Claim and Claim Adjustment Expenses [Abstract]
Net claim and claim adjustment expenses	46
Commercial auto
Net Liability for Unpaid Claim and Claim Adjustment Expenses [Abstract]
Net claim and claim adjustment expenses	1,247
General liability
Net Liability for Unpaid Claim and Claim Adjustment Expenses [Abstract]
Net claim and claim adjustment expenses	4,356
Workers’ compensation
Net Liability for Unpaid Claim and Claim Adjustment Expenses [Abstract]
Net claim and claim adjustment expenses	3,543
Other property and casualty operations
Net Liability for Unpaid Claim and Claim Adjustment Expenses [Abstract]
Net claim and claim adjustment expenses	$ 3,257

Claim and Claim Adjustment Ex_8

Claim and Claim Adjustment Expense Reserves - Medical Professional Liability (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) Claim	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2015	$ 4,096	$ 3,679	$ 3,481
Total net liability for unpaid claim and claim adjustment expenses	19,263	18,163	16,929	$ 16,300
Property and casualty
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total net liability for unpaid claim and claim adjustment expenses	18,334	17,213
Medical professional liability
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	4,244
IBNR	916
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	2,884
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented	1,360
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2015	33
Liability for unallocated claim adjustment expenses for accident years presented	32
Total net liability for unpaid claim and claim adjustment expenses	1,425
Net Strengthening (Releases) of Prior Accident Year Reserves
Total net development for the accident years presented above	(17)	11	13
Total net development for accident years prior to 2015	9	(6)	0
Total unallocated claim adjustment expense development	0	0	5
Total	(8)	5	18
Medical professional liability | Short-duration Insurance Contracts, Accident Year 2015
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	494	494	498	501	$ 510	$ 488	$ 494	$ 510	$ 499	$ 433
IBNR	$ 11
Cumulative number of claims | Claim	18,228
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 471	463	458	444	420	384	313	230	101	$ 22
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	0	(4)	(3)	(9)	22	(6)	(16)	11	66
IBNR, Total	61
Medical professional liability | Short-duration Insurance Contracts, Accident Year 2016
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	513	514	508	510	508	499	485	487	427
IBNR	$ 16
Cumulative number of claims | Claim	16,195
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 489	483	460	436	401	339	246	121	$ 18
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	(1)	6	(2)	2	9	14	(2)	60
IBNR, Total	86
Medical professional liability | Short-duration Insurance Contracts, Accident Year 2017
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	463	456	460	455	460	458	449	412
IBNR	$ 18
Cumulative number of claims | Claim	15,384
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 427	417	388	355	308	235	107	$ 19
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	7	(4)	5	(5)	2	9	37
IBNR, Total	51
Medical professional liability | Short-duration Insurance Contracts, Accident Year 2018
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	499	495	470	448	431	429	404
IBNR	$ 28
Cumulative number of claims | Claim	15,331
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 453	418	349	290	211	115	$ 21
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	4	25	22	17	2	25
IBNR, Total	95
Medical professional liability | Short-Duration Insurance Contract, Accident Year 2019
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	481	469	471	458	445	430
IBNR	$ 43
Cumulative number of claims | Claim	14,515
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 395	349	280	183	91	$ 17
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	12	(2)	13	13	15
IBNR, Total	51
Medical professional liability | Short-Duration Insurance Contract, Accident Year 2020
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	419	447	455	476	477
IBNR	$ 100
Cumulative number of claims | Claim	11,289
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 258	201	139	61	$ 11
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	(28)	(8)	(21)	(1)
IBNR, Total	(58)
Medical professional liability | Short-Duration Insurance Contract, Accident Year 2021
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	349	374	376	377
IBNR	$ 117
Cumulative number of claims | Claim	9,935
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 170	118	49	$ 11
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	(25)	(2)	(1)
IBNR, Total	(28)
Medical professional liability | Short-Duration Insurance Contract, Accident Year 2022
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	333	329	329
IBNR	$ 143
Cumulative number of claims | Claim	9,965
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 122	57	$ 10
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	4	0
IBNR, Total	4
Medical professional liability | Short-Duration Insurance Contract, Accident Year 2023
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	350	340
IBNR	$ 162
Cumulative number of claims | Claim	10,424
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 86	$ 14
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	10
IBNR, Total	10
Medical professional liability | Short-Duration Insurance Contract, Accident Year 2024
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	343
IBNR	$ 278
Cumulative number of claims | Claim	8,561
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 13

Claim and Claim Adjustment Ex_9

Claim and Claim Adjustment Expense Reserves - Other Professional Liability and Management Liability (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) Claim	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2015	$ 4,096	$ 3,679	$ 3,481
Total net liability for unpaid claim and claim adjustment expenses	19,263	18,163	16,929	$ 16,300
Property and casualty
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total net liability for unpaid claim and claim adjustment expenses	18,334	17,213
Other professional liability and management liability
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	9,796
IBNR	2,688
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	5,983
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented	3,813
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2015	98
Liability for unallocated claim adjustment expenses for accident years presented	56
Total net liability for unpaid claim and claim adjustment expenses	3,967
Net Strengthening (Releases) of Prior Accident Year Reserves
Total net development for the accident years presented above	41	47	44
Total net development for accident years prior to 2015	3	(10)	6
Total unallocated claim adjustment expense development	5	0	0
Total	49	37	50
Other professional liability and management liability | Short-duration Insurance Contracts, Accident Year 2015
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	865	858	855	836	$ 813	$ 807	$ 832	$ 877	$ 892	$ 888
IBNR	$ 21
Cumulative number of claims | Claim	17,457
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 813	808	794	725	677	612	542	404	234	$ 60
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	7	3	19	23	6	(25)	(45)	(15)	4
IBNR, Total	(23)
Other professional liability and management liability | Short-duration Insurance Contracts, Accident Year 2016
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	912	906	888	891	907	904	900	900	901
IBNR	$ 37
Cumulative number of claims | Claim	17,989
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 856	826	784	736	701	625	466	248	$ 64
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	6	18	(3)	(16)	3	4	0	(1)
IBNR, Total	11
Other professional liability and management liability | Short-duration Insurance Contracts, Accident Year 2017
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	752	746	758	775	791	813	845	847
IBNR	$ 51
Cumulative number of claims | Claim	18,215
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 672	630	596	557	498	394	222	$ 57
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	6	(12)	(17)	(16)	(22)	(32)	(2)
IBNR, Total	(95)
Other professional liability and management liability | Short-duration Insurance Contracts, Accident Year 2018
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	987	941	923	906	869	864	850
IBNR	$ 57
Cumulative number of claims | Claim	20,071
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 847	779	706	599	473	282	$ 54
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	46	18	17	37	5	14
IBNR, Total	137
Other professional liability and management liability | Short-Duration Insurance Contract, Accident Year 2019
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	970	939	876	856	845	837
IBNR	$ 96
Cumulative number of claims | Claim	19,548
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 801	699	567	422	263	$ 64
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	31	63	20	11	8
IBNR, Total	133
Other professional liability and management liability | Short-Duration Insurance Contract, Accident Year 2020
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	945	945	951	944	930
IBNR	$ 168
Cumulative number of claims | Claim	19,509
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 660	523	400	248	$ 67
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	0	(6)	7	14
IBNR, Total	15
Other professional liability and management liability | Short-Duration Insurance Contract, Accident Year 2021
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	965	1,009	1,038	1,037
IBNR	$ 311
Cumulative number of claims | Claim	18,377
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 502	356	217	$ 58
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	(44)	(29)	1
IBNR, Total	(72)
Other professional liability and management liability | Short-Duration Insurance Contract, Accident Year 2022
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	1,084	1,112	1,120
IBNR	$ 465
Cumulative number of claims | Claim	18,376
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 453	225	$ 64
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	(28)	(8)
IBNR, Total	(36)
Other professional liability and management liability | Short-Duration Insurance Contract, Accident Year 2023
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	1,166	1,149
IBNR	$ 564
Cumulative number of claims | Claim	19,587
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 302	$ 64
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	17
IBNR, Total	17
Other professional liability and management liability | Short-Duration Insurance Contract, Accident Year 2024
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	1,150
IBNR	$ 918
Cumulative number of claims | Claim	17,921
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 77

Claim and Claim Adjustment E_10

Claim and Claim Adjustment Expense Reserves - Surety (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) Claim	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2015	$ 4,096	$ 3,679	$ 3,481
Total net liability for unpaid claim and claim adjustment expenses	19,263	18,163	16,929	$ 16,300
Property and casualty
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total net liability for unpaid claim and claim adjustment expenses	18,334	17,213
Surety
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	906
IBNR	427
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	446
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented	460
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2015	14
Liability for unallocated claim adjustment expenses for accident years presented	19
Total net liability for unpaid claim and claim adjustment expenses	493
Net Strengthening (Releases) of Prior Accident Year Reserves
Total net development for the accident years presented above	(63)	(54)	(82)
Total net development for accident years prior to 2015	(5)	11	(1)
Total unallocated claim adjustment expense development	0	0	0
Total	(68)	(43)	(83)
Surety | Short-duration Insurance Contracts, Accident Year 2015
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	45	45	45	53	$ 58	$ 63	$ 79	$ 104	$ 131	$ 131
IBNR	$ 2
Cumulative number of claims | Claim	5,103
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 43	43	42	42	44	42	40	38	26	$ 7
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	0	0	(8)	(5)	(5)	(16)	(25)	(27)	0
IBNR, Total	(86)
Surety | Short-duration Insurance Contracts, Accident Year 2016
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	43	43	58	64	67	84	109	124	124
IBNR	$ 3
Cumulative number of claims | Claim	5,577
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 40	40	41	43	43	45	45	37	$ 5
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	0	(15)	(6)	(3)	(17)	(25)	(15)	0
IBNR, Total	(81)
Surety | Short-duration Insurance Contracts, Accident Year 2017
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	67	67	66	71	84	103	115	120
IBNR	$ 3
Cumulative number of claims | Claim	5,909
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 63	62	62	49	46	41	37	$ 23
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	0	1	(5)	(13)	(19)	(12)	(5)
IBNR, Total	(53)
Surety | Short-duration Insurance Contracts, Accident Year 2018
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	49	51	56	62	91	108	114
IBNR	$ 6
Cumulative number of claims | Claim	6,297
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 41	41	40	39	34	25	$ 5
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	(2)	(5)	(6)	(29)	(17)	(6)
IBNR, Total	(65)
Surety | Short-Duration Insurance Contract, Accident Year 2019
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	82	82	87	98	112	119
IBNR	$ 8
Cumulative number of claims | Claim	6,229
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 74	70	59	44	34	$ 12
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	0	(5)	(11)	(14)	(7)
IBNR, Total	(37)
Surety | Short-Duration Insurance Contract, Accident Year 2020
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	57	67	81	119	128
IBNR	$ 3
Cumulative number of claims | Claim	4,827
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 44	33	28	20	$ 4
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	(10)	(14)	(38)	(9)
IBNR, Total	(71)
Surety | Short-Duration Insurance Contract, Accident Year 2021
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	91	110	129	137
IBNR	$ 45
Cumulative number of claims | Claim	4,884
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 42	35	20	$ 5
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	(19)	(19)	(8)
IBNR, Total	(46)
Surety | Short-Duration Insurance Contract, Accident Year 2022
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	132	158	155
IBNR	$ 74
Cumulative number of claims | Claim	4,893
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 52	35	$ 12
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	(26)	3
IBNR, Total	(23)
Surety | Short-Duration Insurance Contract, Accident Year 2023
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	169	175
IBNR	$ 138
Cumulative number of claims | Claim	4,378
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 27	$ 8
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	(6)
IBNR, Total	(6)
Surety | Short-Duration Insurance Contract, Accident Year 2024
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	171
IBNR	$ 145
Cumulative number of claims | Claim	2,940
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 20

Claim and Claim Adjustment E_11

Claim and Claim Adjustment Expense Reserves - Commercial Auto (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) Claim	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2015	$ 4,096	$ 3,679	$ 3,481
Total net liability for unpaid claim and claim adjustment expenses	19,263	18,163	16,929	$ 16,300
Property and casualty
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total net liability for unpaid claim and claim adjustment expenses	18,334	17,213
Commercial auto
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	3,745
IBNR	820
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	2,516
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented	1,229
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2015	1
Liability for unallocated claim adjustment expenses for accident years presented	17
Total net liability for unpaid claim and claim adjustment expenses	1,247
Net Strengthening (Releases) of Prior Accident Year Reserves
Total net development for the accident years presented above	110	28	46
Total net development for accident years prior to 2015	(3)	2	3
Total unallocated claim adjustment expense development	0	3	0
Total	107	33	49
Commercial auto | Short-duration Insurance Contracts, Accident Year 2015
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	184	184	182	183	$ 181	$ 183	$ 190	$ 190	$ 199	$ 201
IBNR	$ 2
Cumulative number of claims | Claim	30,430
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 182	180	179	178	175	172	153	130	96	$ 52
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	0	2	(1)	2	(2)	(7)	0	(9)	(2)
IBNR, Total	(17)
Commercial auto | Short-duration Insurance Contracts, Accident Year 2016
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	195	197	200	195	190	186	186	186	198
IBNR	$ 1
Cumulative number of claims | Claim	30,457
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 193	192	190	185	175	154	126	93	$ 52
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	(2)	(3)	5	5	4	0	0	(12)
IBNR, Total	(3)
Commercial auto | Short-duration Insurance Contracts, Accident Year 2017
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	241	241	239	232	221	200	198	199
IBNR	$ 4
Cumulative number of claims | Claim	30,947
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 235	232	225	203	178	150	107	$ 58
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	0	2	7	11	21	2	(1)
IBNR, Total	42
Commercial auto | Short-duration Insurance Contracts, Accident Year 2018
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	260	255	254	245	227	227	229
IBNR	$ 2
Cumulative number of claims | Claim	34,333
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 256	249	238	212	175	128	$ 66
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	5	1	9	18	0	(2)
IBNR, Total	31
Commercial auto | Short-Duration Insurance Contract, Accident Year 2019
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	327	325	323	289	266	257
IBNR	$ 7
Cumulative number of claims | Claim	37,280
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 312	295	257	203	147	$ 77
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	2	2	34	23	9
IBNR, Total	70
Commercial auto | Short-Duration Insurance Contract, Accident Year 2020
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	303	298	304	303	310
IBNR	$ 14
Cumulative number of claims | Claim	29,182
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 276	246	197	134	$ 71
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	5	(6)	1	(7)
IBNR, Total	(7)
Commercial auto | Short-Duration Insurance Contract, Accident Year 2021
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	393	390	388	397
IBNR	$ 51
Cumulative number of claims | Claim	33,028
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 305	240	168	$ 83
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	3	2	(9)
IBNR, Total	(4)
Commercial auto | Short-Duration Insurance Contract, Accident Year 2022
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	496	465	437
IBNR	$ 90
Cumulative number of claims | Claim	37,230
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 334	236	$ 112
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	31	28
IBNR, Total	59
Commercial auto | Short-Duration Insurance Contract, Accident Year 2023
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	620	554
IBNR	$ 202
Cumulative number of claims | Claim	42,345
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 270	$ 127
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	66
IBNR, Total	66
Commercial auto | Short-Duration Insurance Contract, Accident Year 2024
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	726
IBNR	$ 447
Cumulative number of claims | Claim	40,718
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 153

Claim and Claim Adjustment E_12

Claim and Claim Adjustment Expense Reserves - General Liability (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) Claim	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2015	$ 4,096	$ 3,679	$ 3,481
Total net liability for unpaid claim and claim adjustment expenses	19,263	18,163	16,929	$ 16,300
Property and casualty
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total net liability for unpaid claim and claim adjustment expenses	18,334	17,213
General liability
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	8,296
IBNR	3,215
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	4,173
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented	4,123
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2015	171
Liability for unallocated claim adjustment expenses for accident years presented	62
Total net liability for unpaid claim and claim adjustment expenses	4,356
Net Strengthening (Releases) of Prior Accident Year Reserves
Total net development for the accident years presented above	65	148	57
Total net development for accident years prior to 2015	10	1	10
Total unallocated claim adjustment expense development	0	0	0
Total	75	149	67
General liability | Short-duration Insurance Contracts, Accident Year 2015
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	656	639	625	617	$ 602	$ 600	$ 589	$ 574	$ 576	$ 581
IBNR	$ 39
Cumulative number of claims | Claim	24,309
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 581	573	561	530	501	446	357	230	110	$ 19
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	17	14	8	15	2	11	15	(2)	(5)
IBNR, Total	75
General liability | Short-duration Insurance Contracts, Accident Year 2016
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	712	704	684	683	673	671	667	659	623
IBNR	$ 27
Cumulative number of claims | Claim	24,901
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 652	620	582	524	481	407	279	163	$ 32
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	8	20	1	10	2	4	8	36
IBNR, Total	89
General liability | Short-duration Insurance Contracts, Accident Year 2017
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	713	690	652	630	634	632	632	632
IBNR	$ 16
Cumulative number of claims | Claim	22,544
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 657	606	553	471	399	250	118	$ 23
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	23	38	22	(4)	2	0	0
IBNR, Total	81
General liability | Short-duration Insurance Contracts, Accident Year 2018
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	665	679	650	639	646	644	653
IBNR	$ 83
Cumulative number of claims | Claim	20,553
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 546	491	428	307	228	107	$ 33
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	(14)	29	11	(7)	2	(9)
IBNR, Total	12
General liability | Short-Duration Insurance Contract, Accident Year 2019
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	727	720	691	682	682	680
IBNR	$ 129
Cumulative number of claims | Claim	19,907
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 532	455	322	181	98	$ 25
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	7	29	9	0	2
IBNR, Total	47
General liability | Short-Duration Insurance Contract, Accident Year 2020
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	702	736	726	722	723
IBNR	$ 237
Cumulative number of claims | Claim	14,964
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 367	280	192	99	$ 23
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	(34)	10	4	(1)
IBNR, Total	(21)
General liability | Short-Duration Insurance Contract, Accident Year 2021
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	814	793	784	782
IBNR	$ 299
Cumulative number of claims | Claim	15,952
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 391	262	140	$ 26
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	21	9	2
IBNR, Total	32
General liability | Short-Duration Insurance Contract, Accident Year 2022
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	930	928	929
IBNR	$ 515
Cumulative number of claims | Claim	17,527
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 260	123	$ 29
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	2	(1)
IBNR, Total	1
General liability | Short-Duration Insurance Contract, Accident Year 2023
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	1,106	1,071
IBNR	$ 726
Cumulative number of claims | Claim	17,037
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 153	$ 33
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	35
IBNR, Total	35
General liability | Short-Duration Insurance Contract, Accident Year 2024
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	1,271
IBNR	$ 1,144
Cumulative number of claims | Claim	14,632
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 34

Claim and Claim Adjustment E_13

Claim and Claim Adjustment Expense Reserves - Workers' Compensation (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) Claim	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2015	$ 4,096	$ 3,679	$ 3,481
Total net liability for unpaid claim and claim adjustment expenses	19,263	18,163	16,929	$ 16,300
Property and casualty
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total net liability for unpaid claim and claim adjustment expenses	18,334	17,213
Workers’ compensation
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	4,232
IBNR	1,216
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	2,489
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented	1,743
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2015	1,757
Other	(22)
Liability for unallocated claim adjustment expenses for accident years presented	65
Total net liability for unpaid claim and claim adjustment expenses	3,543
Net Strengthening (Releases) of Prior Accident Year Reserves
Total net development for the accident years presented above	(95)	(133)	(81)
Adjustment for development on a discounted basis	(2)	(2)	(3)
Total net development for accident years prior to 2015	(105)	(74)	(78)
Total unallocated claim adjustment expense development	0	6	10
Total	(202)	(203)	(152)
Workers’ compensation | Short-duration Insurance Contracts, Accident Year 2015
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	324	334	353	372	$ 382	$ 394	$ 408	$ 406	$ 431	$ 422
IBNR	$ 45
Cumulative number of claims | Claim	31,916
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 261	259	256	251	243	231	212	180	131	$ 51
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	(10)	(19)	(19)	(10)	(12)	(14)	2	(25)	9
IBNR, Total	(98)
Workers’ compensation | Short-duration Insurance Contracts, Accident Year 2016
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	293	308	331	355	366	382	396	405	426
IBNR	$ 45
Cumulative number of claims | Claim	32,000
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 238	235	234	227	219	198	169	129	$ 53
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	(15)	(23)	(24)	(11)	(16)	(14)	(9)	(21)
IBNR, Total	(133)
Workers’ compensation | Short-duration Insurance Contracts, Accident Year 2017
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	383	398	399	402	400	421	432	440
IBNR	$ 65
Cumulative number of claims | Claim	33,156
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 293	287	279	265	243	207	151	$ 63
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	(15)	(1)	(3)	2	(21)	(11)	(8)
IBNR, Total	(57)
Workers’ compensation | Short-duration Insurance Contracts, Accident Year 2018
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	399	404	415	415	428	440	450
IBNR	$ 65
Cumulative number of claims | Claim	34,914
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 307	298	280	259	229	163	$ 68
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	(5)	(11)	0	(13)	(12)	(10)
IBNR, Total	(51)
Workers’ compensation | Short-Duration Insurance Contract, Accident Year 2019
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	416	419	436	437	449	452
IBNR	$ 67
Cumulative number of claims | Claim	34,377
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 310	291	262	223	169	$ 71
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	(3)	(17)	(1)	(12)	(3)
IBNR, Total	(36)
Workers’ compensation | Short-Duration Insurance Contract, Accident Year 2020
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	393	414	446	466	477
IBNR	$ 107
Cumulative number of claims | Claim	29,481
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 246	228	200	147	$ 65
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	(21)	(32)	(20)	(11)
IBNR, Total	(84)
Workers’ compensation | Short-Duration Insurance Contract, Accident Year 2021
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	421	432	454	468
IBNR	$ 116
Cumulative number of claims | Claim	30,126
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 256	222	164	$ 67
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	(11)	(22)	(14)
IBNR, Total	(47)
Workers’ compensation | Short-Duration Insurance Contract, Accident Year 2022
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	478	489	497
IBNR	$ 148
Cumulative number of claims | Claim	33,428
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 258	192	$ 79
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	(11)	(8)
IBNR, Total	(19)
Workers’ compensation | Short-Duration Insurance Contract, Accident Year 2023
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	551	555
IBNR	$ 233
Cumulative number of claims | Claim	36,822
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 209	$ 87
Net Strengthening (Releases) of Prior Accident Year Reserves
Total	(4)
IBNR, Total	(4)
Workers’ compensation | Short-Duration Insurance Contract, Accident Year 2024
Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses
Total	574
IBNR	$ 325
Cumulative number of claims | Claim	34,332
Cumulative Net Paid Claim and Allocated Claim Adjustment Expenses
Total	$ 111

Claim and Claim Adjustment E_14

Claim and Claim Adjustment Expense Reserves - Supplementary Information about Average Historical Claims Duration (Details)	Dec. 31, 2024
Average Annual Percentage Payout of Ultimate Net Incurred Claim and Allocated Claim Adjustment Expenses, Surety:
Short-Duration Insurance Contracts, Historical Claims Duration, Surety, Year One	17.30%
Short-Duration Insurance Contracts, Historical Claims Duration, Surety, Year Two	41%
Short-Duration Insurance Contracts, Historical Claims Duration, Surety, Year Three	16.40%
Short-Duration Insurance Contracts, Historical Claims Duration, Surety, Year Four	8.10%
Short-Duration Insurance Contracts, Historical Claims Duration, Surety, Year Five	3.90%
Short-Duration Insurance Contracts, Historical Claims Duration, Surety, Year Six	6.20%
Short-Duration Insurance Contracts, Historical Claims Duration, Surety, Year Seven	(2.30%)
Short-Duration Insurance Contracts, Historical Claims Duration, Surety, Year Eight	(0.30%)
Short-Duration Insurance Contracts, Historical Claims Duration, Surety, Year Nine	1.10%
Short-Duration Insurance Contracts, Historical Claims Duration, Surety, Year Ten	0%
Medical professional liability
Average Annual Percentage Payout of Ultimate Net Incurred Claim and Allocated Claim Adjustment Expenses in Year:
Short-duration Insurance Contracts, Historical Claims Duration, Year One	3.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	16.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	21.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	16.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	12.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	8.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	5.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight	3.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine	1.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten	1.60%
Other professional liability and management liability
Average Annual Percentage Payout of Ultimate Net Incurred Claim and Allocated Claim Adjustment Expenses in Year:
Short-duration Insurance Contracts, Historical Claims Duration, Year One	6.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	19.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	19.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	14.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	10.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	6.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	5.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight	6.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine	2.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten	0.60%
Commercial auto
Average Annual Percentage Payout of Ultimate Net Incurred Claim and Allocated Claim Adjustment Expenses in Year:
Short-duration Insurance Contracts, Historical Claims Duration, Year One	23.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	22.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	18.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	14.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	10.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	5.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	2.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight	0.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine	0.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten	1.10%
General liability
Average Annual Percentage Payout of Ultimate Net Incurred Claim and Allocated Claim Adjustment Expenses in Year:
Short-duration Insurance Contracts, Historical Claims Duration, Year One	3.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	12.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	15.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	16.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	13.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	9.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	7.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight	5.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine	3.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten	1.20%
Workers’ compensation
Average Annual Percentage Payout of Ultimate Net Incurred Claim and Allocated Claim Adjustment Expenses in Year:
Short-duration Insurance Contracts, Historical Claims Duration, Year One	16.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	23.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	14.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	8.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	5.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	3.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	2.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight	1.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine	1%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten	0.60%

Claim and Claim Adjustment E_15

Claim and Claim Adjustment Expense Reserves - A&EP Reserves (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2010
Additional amounts ceded under LPT [Abstract]
Net A&EP adverse development before consideration of LPT	$ 103	$ 86	$ 92
Provision for uncollectible third-party reinsurance on A&EP			(5)
Total additional amounts ceded under LPT	103	86	87
Retroactive reinsurance benefit recognized	(95)	(94)	(91)
Pretax impact of deferred retroactive reinsurance	8	(8)	(4)
A&EP Reserves
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
Additional amounts ceded under LPT [Abstract]
Releases from provision for uncollectible third-party reinsurance	0	0	$ 5
Cumulative amounts ceded under loss portfolio transfer	3,700	3,600
Unrecognized deferred retroactive reinsurance benefit	425	$ 417
Fair value of collateral trust account	$ 2,300

Claim and Claim Adjustment E_16

Claim and Claim Adjustment Expense Reserves - Excess Workers' Compensation LPT (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	Feb. 05, 2021	Mar. 31, 2021	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Jan. 01, 2020
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Reinsurance recoverable			$ 6,051	$ 5,412
Claims paid			5,189	$ 4,601	$ 4,302
Outstanding reserves maintained as security for obligations			298
CNA | Loss Portfolio Transfer for Workers' Compensation Liabilities
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Reinsurance recoverable			$ 690			$ 690
Payment for reinsurance premium	$ 697
Claims paid	$ 64
Loss contingency, after tax and noncontrolling interests		$ 11
CNA | Loss Portfolio Transfer for Workers' Compensation Liabilities | Maximum
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Reinsurance recoverable						$ 1,000

Future Policy Benefits Reserv_3

Future Policy Benefits Reserves - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2024	Dec. 31, 2023
Insurance [Abstract]
Pretax change in LFPB	$ 15	$ 8
Liability for future policy benefit, expected future gross premium, discounted, before reinsurance			$ 3,600	$ 3,800
Liability for future policy benefit, weighted-average duration			11 years	11 years
Liability for future policy benefit, adverse development, expense			$ 159	$ 164
Liability future policy benefit, losses recognized in prior period			$ 29	$ 42

Future Policy Benefits Reserv_4

Future Policy Benefits Reserves - Schedule of Balances and Changes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Present value of future net premiums
Balance, January 1		$ 3,710	$ 3,991	$ 4,735
Effect of changes in discount rate	$ (125)	(74)	(880)
Balance, January 1, at original locked in discount rate	3,585	3,917	3,855
Effect of changes in cash flow assumptions		111	28	352
Expect of actual variances from expected experience		(41)	(126)	(49)
Adjusted balance, January 1		3,655	3,819	4,158
Interest accrual	183	202	216
Net premiums: earned during period	(420)	(436)	(457)
Balance, end of period at original locked in discount rate	3,418	3,585	3,917
Effect of changes in discount rate	7	125	74
Balance, December 31	3,425	3,710	3,991
Present value of future benefits & expenses
Balance, January 1		17,669	17,471	22,745
Effect of changes in discount rate	440	(578)	(125)	(5,942)
Balance, January 1, at original locked in discount rate	17,091	17,346	16,803
Effect of changes in cash flow assumptions		126	36	538
Effect of actual variances from expected experience		69	(46)	(21)
Adjusted balance, January 1		17,286	17,336	17,320
Interest accrual	924	962	979
Benefit & expense payments	(1,187)	(1,207)	(953)
Balance, end of period at original locked in discount rate	17,023	17,091	17,346
Effect of changes in discount rate	(440)	578	125	$ 5,942
Balance, December 31	16,583	17,669	17,471
Net LFPB	13,158	13,959	13,480
Re-measurement loss of insurance claims and policyholders’ benefits	$ (125)	$ (88)	$ (214)

Future Policy Benefits Reserv_5

Future Policy Benefits Reserves - Schedule of Earned Premiums and Interest Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Insurance [Abstract]
Earned premiums	$ 437	$ 451	$ 473
Interest expense	$ 741	$ 760	$ 763

Future Policy Benefits Reserv_6

Future Policy Benefits Reserves - Undiscounted Expected Future Benefit and Expense Payments and Undiscounted Expected Future Gross Premiums (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Insurance [Abstract]
Expected future benefit and expense payments	$ 31,712	$ 32,851
Expected future gross premiums	$ 5,183	$ 5,414

Future Policy Benefits Reserv_7

Future Policy Benefits Reserves - Weighted Average Interest Rates (Details)	Dec. 31, 2024	Dec. 31, 2023
Insurance [Abstract]
Original locked in discount rate	5.20%	5.22%
Upper-medium grade fixed income instrument discount rate	5.51%	4.94%

Leases - Additional Information

Leases - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Operating lease right of use asset	$ 320	$ 302
Total lease liabilities	406	384
Total lease expense	79	87	$ 89
Operating lease expense	51	58	60
Variable lease expense	23	24	26
Short term lease expense	5	5	3
Lease liability cash payments	80	60	64
Operating lease right of use assets obtained in exchange for lease obligations	$ 73	$ 39	$ 118
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Other assets	Other assets
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Other liabilities	Other liabilities

Leases - Maturities of Lease Li

Leases - Maturities of Lease Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Operating Leases
2025	$ 64
2026	55
2027	53
2028	48
2029	49
Thereafter	291
Total	560
Less: discount	154
Total lease liabilities	$ 406	$ 384

Leases - Weighted Average Remai

Leases - Weighted Average Remaining Lease Term for Operating Leases and Weighted Average Discount Rate (Details)	Dec. 31, 2024
Lessee Disclosure [Abstract]
Weighted average remaining lease term	10 years 6 months
Weighted average discount rate	3.90%

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Taxes [Abstract]
Notice period for cancellation of agreement	30 days
Income tax benefit from an adjustment to deferred state income taxes	$ 36
Deferred taxes on undistributed earnings of subsidiaries	0
Unrecognized tax benefits	0	$ 0	$ 0
Interest expense (benefit)	0	0	0
Income tax penalties expense	0	$ 0	$ 0
Foreign
Income Taxes [Abstract]
Tax credit carryforward, subject to expiration	8
Net operating loss carryforwards, not subject to expiration	138
Tax credit carryforward, not subject to expiration	10
State
Income Taxes [Abstract]
Valuation allowance recorded	$ 19
Minimum | Non-insurance warranty – CNA Financial
Income Taxes [Abstract]
Percentage of equity method investments in associated companies	80%

Income Taxes - Current and Defe

Income Taxes - Current and Deferred Components of Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Federal:
Current	$ 320	$ 267	$ 241
Deferred	(10)	81	(60)
State and city:
Current	47	20	25
Deferred	(40)	31	15
Foreign	63	52	2
Income tax expense	$ 380	$ 451	$ 223

Income Taxes - Reconciliation b

Income Taxes - Reconciliation between Federal Income Tax Expense at Statutory Rates and Actual Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income before income tax:
U.S.	$ 1,672	$ 1,798	$ 973
Foreign	202	198	141
Income (loss) before income tax	1,874	1,996	1,114
Income tax expense at statutory rate	393	419	235
Increase (decrease) in income tax expense resulting from:
Exempt investment income	(22)	(28)	(38)
Foreign related tax differential	(5)	1	(15)
Valuation allowance	1	2	1
State taxes	8	48	36
Other	5	9	4
Income tax expense	$ 380	$ 451	$ 223

Income Taxes - Deferred Tax Ass

Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Insurance reserves:
Property and casualty claim and claim adjustment expense reserves	$ 234	$ 202
Unearned premium reserves	225	213
Policyholder reserves		160
Deferred revenue	85	70
Employee benefits	79	86
Deferred retroactive reinsurance benefit	89	88
Net operating loss carryforwards	35	44
Net unrealized losses	485	416
Other	153	159
Total deferred tax assets	1,385	1,438
Valuation allowance	(19)	(18)
Net deferred tax assets	1,366	1,420
Deferred tax liabilities:
Deferred acquisition costs	(140)	(126)
Policyholder reserves	(48)
Property, plant and equipment	(963)	(938)
Basis differential in investment in subsidiary	(481)	(502)
Other liabilities	(245)	(198)
Total deferred tax liabilities	(1,877)	(1,764)
Net deferred tax liabilities	(511)	(344)
Other Assets
Insurance reserves:
Total deferred tax assets	$ 39	$ 54

Debt - Schedule of Debt (Detail

Debt - Schedule of Debt (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Feb. 29, 2024	Dec. 31, 2023
Debt [Abstract]
Total long term debt and finance lease obligation	$ 9,014,000,000
Less unamortized discount and issuance costs	70,000,000
Debt, net	$ 8,944,000,000		$ 9,003,000,000
Loews Corporation | 3.8% Senior Notes Due 2026
Debt [Abstract]
Interest rate	3.80%
Maturity year	2026
Effective interest rate	3.90%
Debt authorized	$ 500,000,000
Loews Corporation | 3.2% Senior Notes Due 2030
Debt [Abstract]
Interest rate	3.20%
Maturity year	2030
Effective interest rate	3.30%
Debt authorized	$ 500,000,000
Loews Corporation | 6.0% Senior Notes Due 2035
Debt [Abstract]
Interest rate	6%
Maturity year	2035
Effective interest rate	6.20%
Debt authorized	$ 300,000,000
Loews Corporation | 4.1% Senior Notes Due 2043
Debt [Abstract]
Interest rate	4.10%
Maturity year	2043
Effective interest rate	4.30%
Debt authorized	$ 500,000,000
CNA Financial | 4.0% Senior Notes Due 2024
Debt [Abstract]
Interest rate	4%
Maturity year	2024
Effective interest rate	4%
Debt authorized	$ 550,000,000
CNA Financial | 4.5% Senior Notes Due 2026
Debt [Abstract]
Interest rate	4.50%
Maturity year	2026
Effective interest rate	4.50%
Debt authorized	$ 500,000,000
CNA Financial | 3.5% Senior Notes Due 2027
Debt [Abstract]
Interest rate	3.50%
Maturity year	2027
Effective interest rate	3.50%
Debt authorized	$ 500,000,000
CNA Financial | 3.9% Senior Notes Due 2029
Debt [Abstract]
Interest rate	3.90%
Maturity year	2029
Effective interest rate	3.90%
Debt authorized	$ 500,000,000
CNA Financial | 2.1% Senior Notes Due 2030
Debt [Abstract]
Interest rate	2.10%
Maturity year	2030
Effective interest rate	2.10%
Debt authorized	$ 500,000,000
CNA Financial | 5.5% Senior Notes Due 2033
Debt [Abstract]
Interest rate	5.50%
Maturity year	2033
Effective interest rate	5.70%
Debt authorized	$ 500,000,000
CNA Financial | 5.1% Senior Notes Due 2034
Debt [Abstract]
Interest rate	5.10%
Maturity year	2034
Effective interest rate	5.30%
Debt authorized	$ 500,000,000
Boardwalk Pipelines | Variable rate revolving credit facility due 2028
Debt [Abstract]
Maturity year	2028
Effective interest rate	6.70%
Boardwalk Pipelines | 5.0% Senior Notes Due 2024
Debt [Abstract]
Interest rate	5%
Maturity year	2024
Effective interest rate	5.20%
Debt authorized	$ 600,000,000
Boardwalk Pipelines | 6.0% Senior Notes Due 2026
Debt [Abstract]
Interest rate	6%
Maturity year	2026
Effective interest rate	6.20%
Debt authorized	$ 550,000,000
Boardwalk Pipelines | 4.5% Senior Notes Due 2027
Debt [Abstract]
Interest rate	4.50%
Maturity year	2027
Effective interest rate	4.60%
Debt authorized	$ 500,000,000
Boardwalk Pipelines | 7.3% Senior Debentures Due 2027
Debt [Abstract]
Interest rate	7.30%
Maturity year	2027
Effective interest rate	8.10%
Debt authorized	$ 100,000,000
Boardwalk Pipelines | 4.8% Senior Notes Due 2029
Debt [Abstract]
Interest rate	4.80%
Maturity year	2029
Effective interest rate	4.90%
Debt authorized	$ 500,000,000
Boardwalk Pipelines | 3.4% Senior Notes Due 2031
Debt [Abstract]
Interest rate	3.40%
Maturity year	2031
Effective interest rate	3.50%
Debt authorized	$ 500,000,000
Boardwalk Pipelines | 3.6% Senior Notes Due 2032
Debt [Abstract]
Interest rate	3.60%
Maturity year	2032
Effective interest rate	3.70%
Debt authorized	$ 500,000,000
Boardwalk Pipelines | 5.6% Senior Notes Due 2034
Debt [Abstract]
Interest rate	5.60%	5.60%
Maturity year	2034
Effective interest rate	5.80%
Debt authorized	$ 600,000,000	$ 600,000,000
Loews Hotels & Co | Senior Debt, Principally Mortgages
Debt [Abstract]
Effective interest rate	6.70%		6.80%
Operating Segments
Debt [Abstract]
Total long term debt and finance lease obligation	$ 9,065,000,000		$ 9,063,000,000
Less unamortized discount and issuance costs	70,000,000		60,000,000
Operating Segments | Loews Corporation
Debt [Abstract]
Total long term debt and finance lease obligation	1,800,000,000
Less unamortized discount and issuance costs	15,000,000
Debt, net	1,785,000,000
Operating Segments | Loews Corporation | 3.8% Senior Notes Due 2026
Debt [Abstract]
Long term debt	500,000,000		500,000,000
Operating Segments | Loews Corporation | 3.2% Senior Notes Due 2030
Debt [Abstract]
Long term debt	500,000,000		500,000,000
Operating Segments | Loews Corporation | 6.0% Senior Notes Due 2035
Debt [Abstract]
Long term debt	300,000,000		300,000,000
Operating Segments | Loews Corporation | 4.1% Senior Notes Due 2043
Debt [Abstract]
Long term debt	500,000,000		500,000,000
Operating Segments | CNA Financial
Debt [Abstract]
Total long term debt and finance lease obligation	3,000,000,000
Less unamortized discount and issuance costs	27,000,000
Debt, net	2,973,000,000
Operating Segments | CNA Financial | 4.0% Senior Notes Due 2024
Debt [Abstract]
Long term debt			550,000,000
Operating Segments | CNA Financial | 4.5% Senior Notes Due 2026
Debt [Abstract]
Long term debt	500,000,000		500,000,000
Operating Segments | CNA Financial | 3.5% Senior Notes Due 2027
Debt [Abstract]
Long term debt	500,000,000		500,000,000
Operating Segments | CNA Financial | 3.9% Senior Notes Due 2029
Debt [Abstract]
Long term debt	500,000,000		500,000,000
Operating Segments | CNA Financial | 2.1% Senior Notes Due 2030
Debt [Abstract]
Long term debt	500,000,000		500,000,000
Operating Segments | CNA Financial | 5.5% Senior Notes Due 2033
Debt [Abstract]
Long term debt	500,000,000		500,000,000
Operating Segments | CNA Financial | 5.1% Senior Notes Due 2034
Debt [Abstract]
Long term debt	500,000,000
Operating Segments | Boardwalk Pipelines
Debt [Abstract]
Finance lease obligation	4,000,000		5,000,000
Total long term debt and finance lease obligation	3,254,000,000
Less unamortized discount and issuance costs	19,000,000
Debt, net	3,235,000,000
Operating Segments | Boardwalk Pipelines | Variable rate revolving credit facility due 2028
Debt [Abstract]
Long term debt			25,000,000
Operating Segments | Boardwalk Pipelines | 5.0% Senior Notes Due 2024
Debt [Abstract]
Long term debt			600,000,000
Operating Segments | Boardwalk Pipelines | 6.0% Senior Notes Due 2026
Debt [Abstract]
Long term debt	550,000,000		550,000,000
Operating Segments | Boardwalk Pipelines | 4.5% Senior Notes Due 2027
Debt [Abstract]
Long term debt	500,000,000		500,000,000
Operating Segments | Boardwalk Pipelines | 7.3% Senior Debentures Due 2027
Debt [Abstract]
Long term debt	100,000,000		100,000,000
Operating Segments | Boardwalk Pipelines | 4.8% Senior Notes Due 2029
Debt [Abstract]
Long term debt	500,000,000		500,000,000
Operating Segments | Boardwalk Pipelines | 3.4% Senior Notes Due 2031
Debt [Abstract]
Long term debt	500,000,000		500,000,000
Operating Segments | Boardwalk Pipelines | 3.6% Senior Notes Due 2032
Debt [Abstract]
Long term debt	500,000,000		500,000,000
Operating Segments | Boardwalk Pipelines | 5.6% Senior Notes Due 2034
Debt [Abstract]
Long term debt	600,000,000
Operating Segments | Loews Hotels & Co
Debt [Abstract]
Total long term debt and finance lease obligation	1,011,000,000
Less unamortized discount and issuance costs	9,000,000
Debt, net	1,002,000,000
Operating Segments | Loews Hotels & Co | Senior Debt, Principally Mortgages
Debt [Abstract]
Long term debt	1,011,000,000		933,000,000
Intersegment Eliminations
Debt [Abstract]
Total long term debt and finance lease obligation	(51,000,000)
Less unamortized discount and issuance costs
Debt, net	$ (51,000,000)

Debt - Summary of Long-term Deb

Debt - Summary of Long-term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Debt [Abstract]
Principal	$ 9,014
Unamortized Discount and Issuance Costs	70
Debt, net	8,944	$ 9,003
Short Term Debt	5	1,084
Long Term Debt	8,939	7,919
Operating Segments
Debt [Abstract]
Principal	9,065	9,063
Unamortized Discount and Issuance Costs	70	60
Operating Segments | Loews Corporation
Debt [Abstract]
Principal	1,800
Unamortized Discount and Issuance Costs	15
Debt, net	1,785
Short Term Debt
Long Term Debt	1,785
Operating Segments | CNA Financial
Debt [Abstract]
Principal	3,000
Unamortized Discount and Issuance Costs	27
Debt, net	2,973
Short Term Debt
Long Term Debt	2,973
Operating Segments | Boardwalk Pipelines
Debt [Abstract]
Principal	3,254
Unamortized Discount and Issuance Costs	19
Debt, net	3,235
Short Term Debt	1
Long Term Debt	3,234
Operating Segments | Loews Hotels & Co
Debt [Abstract]
Principal	1,011
Unamortized Discount and Issuance Costs	9
Debt, net	1,002
Short Term Debt	4
Long Term Debt	998
Intersegment Eliminations
Debt [Abstract]
Principal	(51)
Unamortized Discount and Issuance Costs
Debt, net	(51)
Short Term Debt
Long Term Debt	$ (51)

Debt - Narrative (Details)

Debt - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) Extension	May 26, 2028 USD ($)	May 27, 2027 USD ($)	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
Long term debt maturing in 2025	$ 5
Long term debt maturing in 2026	1,900
Long term debt maturing in 2027	1,100
Long term debt maturing in 2028	56
Long term debt maturing in 2029	1,200
Long term debt maturing thereafter	4,800
CNA Financial
Debt Instrument [Line Items]
FHLBC stock held	5
Additional liquidity available	108
Outstanding borrowings from FHLBC	$ 0			$ 0
CNA Financial | Senior unsecured revolving credit facility
Debt Instrument [Line Items]
Term	5 years
Maximum borrowing capacity	$ 250
Additional borrowing capacity	$ 100
Number of extensions | Extension	2
Term of extension	1 year
Outstanding borrowings	$ 0
Boardwalk Pipelines | Senior Variable Rate Revolving Credit Facility
Debt Instrument [Line Items]
Outstanding borrowings	$ 0
Boardwalk Pipelines | Senior Variable Rate Revolving Credit Facility | Forecast | Subsequent Event
Debt Instrument [Line Items]
Remaining borrowing capacity		$ 912	$ 1,000

Shareholders' Equity - Componen

Shareholders' Equity - Components of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	$ 16,525	$ 15,201	$ 17,471
Other comprehensive income (loss) before reclassifications, after tax	289	826	(2,358)
Reclassification of (gains) losses from accumulated other comprehensive loss, after tax	398	135	139
Other comprehensive income (loss)	687	961	(2,219)
Amounts attributable to noncontrolling interests	(57)	(77)	219
Purchase of CNA shares/ Other	0	(61)
Balance at end of period	17,937	16,525	15,201
Cumulative Effect, Period of Adoption, Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period			(1,704)
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)	(2)
Other comprehensive income (loss) before reclassifications, after tax	(34)	(24)
Reclassification of (gains) losses from accumulated other comprehensive loss, after tax	33	19	(5)
Other comprehensive income (loss)	(1)	(5)	(5)
Amounts attributable to noncontrolling interests
Purchase of CNA shares/ Other
Balance at end of period	(13)	(12)	(7)
Other comprehensive income (loss) before reclassifications, tax	9	6	0
Reclassification of (gains) losses from accumulated other comprehensive income (loss), tax	(9)	(5)	1
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 | Adjusted Balance
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period			(2)
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)	930
Other comprehensive income (loss) before reclassifications, after tax	(309)	1,072	(6,223)
Reclassification of (gains) losses from accumulated other comprehensive loss, after tax	47	53	126
Other comprehensive income (loss)	(262)	1,125	(6,097)
Amounts attributable to noncontrolling interests	22	(93)	619
Purchase of CNA shares/ Other	3	(46)
Balance at end of period	(1,720)	(1,483)	(2,469)
Other comprehensive income (loss) before reclassifications, tax	81	(290)	1,643
Reclassification of (gains) losses from accumulated other comprehensive income (loss), tax	(13)	(14)	(21)
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			2,079
Cumulative effect adjustments from changes in accounting standards, tax				(617)
Net Unrealized Gains (Losses) on Other Investments | Adjusted Balance
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period			3,009
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)	0
Other comprehensive income (loss) before reclassifications, after tax	712	(318)	3,959
Reclassification of (gains) losses from accumulated other comprehensive loss, after tax
Other comprehensive income (loss)	712	(318)	3,959
Amounts attributable to noncontrolling interests	(59)	26	(410)
Purchase of CNA shares/ Other		(1)
Balance at end of period	324	(329)	(36)
Other comprehensive income (loss) before reclassifications, tax	(189)	85	(1,052)
Reclassification of (gains) losses from accumulated other comprehensive income (loss), tax	0	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			(3,585)
Cumulative effect adjustments from changes in accounting standards, tax				1,063
Cumulative impact of changes in discount rates used to measure long duration contracts | Adjusted Balance
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period			(3,585)
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	(6)
Other comprehensive income (loss) before reclassifications, after tax		(5)	20
Reclassification of (gains) losses from accumulated other comprehensive loss, after tax
Other comprehensive income (loss)	0	(5)	20
Amounts attributable to noncontrolling interests
Purchase of CNA shares/ Other
Balance at end of period	9	9	14
Other comprehensive income (loss) before reclassifications, tax	(1)	2	(7)
Reclassification of (gains) losses from accumulated other comprehensive income (loss), tax	0	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 | Adjusted Balance
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period			(6)
Pension and Postretirement Benefits
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(533)	(622)	(636)
Other comprehensive income (loss) before reclassifications, after tax	22	41	(3)
Reclassification of (gains) losses from accumulated other comprehensive loss, after tax	318	63	18
Other comprehensive income (loss)	340	104	15
Amounts attributable to noncontrolling interests	(28)	(5)	(1)
Purchase of CNA shares/ Other	(3)	(10)
Balance at end of period	(224)	(533)	(622)
Other comprehensive income (loss) before reclassifications, tax	(6)	(10)	1
Reclassification of (gains) losses from accumulated other comprehensive income (loss), tax	(86)	(18)	(5)
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 | Adjusted Balance
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period			(636)
Foreign Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(149)	(200)	(100)
Other comprehensive income (loss) before reclassifications, after tax	(102)	60	(111)
Reclassification of (gains) losses from accumulated other comprehensive loss, after tax
Other comprehensive income (loss)	(102)	60	(111)
Amounts attributable to noncontrolling interests	8	(5)	11
Purchase of CNA shares/ Other		(4)
Balance at end of period	(243)	(149)	(200)
Other comprehensive income (loss) before reclassifications, tax	1	0	0
Reclassification of (gains) losses from accumulated other comprehensive income (loss), tax	0	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 | Adjusted Balance
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period			(100)
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)	186
Balance at end of period	$ (1,867)	$ (2,497)	(3,320)
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			(1,506)
Total Accumulated Other Comprehensive Income (Loss) | Adjusted Balance
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period			$ (1,320)

Shareholders' Equity - Common S

Shareholders' Equity - Common Stock Dividends and Stock Purchases (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net Income Per Share [Abstract]
Dividends declared (in dollars per share)	$ 0.25	$ 0.25	$ 0.25
Dividends paid (in dollars per share)	$ 0.25	$ 0.25	$ 0.25
Treasury Stock, Shares [Abstract]
Purchases of treasury stock (in shares)	7.7	14	12.7
Purchases of treasury stock	$ 617	$ 852	$ 738
Treasury stock, retired (in shares)	7.6
Non-insurance warranty – CNA Financial
Treasury Stock, Shares [Abstract]
Number of stocks purchased during period (in shares)		4.5
Value of stocks purchased during period		$ 178

Revenue from Contracts with C_3

Revenue from Contracts with Customers - Disaggregation of Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenues
Revenues from contracts with customers	$ 2,893	$ 2,360	$ 2,087
Other revenues	98	95	113
Operating revenues and other	2,991	2,455	2,200
Deferred Revenue
Revenue recognized	1,500	1,400
Contract Costs
Capitalized contract cost	3,525	3,661
Amortization of contract costs	1,200
Adjustments to deferred costs	0	0
Receivables
Receivables from Contracts with Customers
Receivables from contracts with customers	240	228
Other liabilities
Deferred Revenue
Deferred revenue	4,600	4,800
Deferred Non-insurance Warranty Acquisition Expenses
Contract Costs
Capitalized contract cost	3,500	3,700
CNA Financial
Disaggregation of Revenues
Operating revenues and other	34	30	32
CNA Financial | Non-insurance warranty – CNA Financial
Disaggregation of Revenues
Revenues from contracts with customers	1,609	1,624	1,574
Boardwalk Pipelines
Disaggregation of Revenues
Operating revenues and other	2,033	1,625	1,443
Boardwalk Pipelines | Transportation and storage of natural gas and NGLs and ethane supply and transportation services – Boardwalk Pipelines
Disaggregation of Revenues
Revenues from contracts with customers	1,987	1,582	1,398
Loews Hotels & Co
Disaggregation of Revenues
Operating revenues and other	924	800	720
Loews Hotels & Co | Lodging and related services – Loews Hotels & Co
Disaggregation of Revenues
Revenues from contracts with customers	$ 906	$ 778	$ 689

Revenue from Contracts with C_4

Revenue from Contracts with Customers - Performance Obligations (Details) $ in Billions	Dec. 31, 2024 USD ($)
Disaggregation of Revenue [Line Items]
Remaining performance obligations	$ 18.6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Disaggregation of Revenue [Line Items]
Remaining performance obligations	$ 2.9
Expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Disaggregation of Revenue [Line Items]
Remaining performance obligations	$ 2.4
Expected timing of satisfaction	1 year

Statutory Accounting Practice_2

Statutory Accounting Practices (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statutory Accounting Practices [Abstract]
Increase in statutory capital and surplus	$ 55	$ 92
Settlements	367
Combined Continental Casualty Companies
Statutory Accounting Practices [Abstract]
Allowable dividends payable without prior supervisory approval	1,100
Dividends paid	995
Statutory Capital and Surplus	11,165	10,946
Statutory Net Income	713	$ 1,172	$ 1,072
Settlements	$ 293

Benefit Plans - Weighted Averag

Benefit Plans - Weighted Average Assumptions Used to Determine Benefit Obligations (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Eligible age for several postretirement benefit plans	55 years
Eligible age for Medicare benefits	65 years
Pension Benefits
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	5.40%	5%	5.20%
Interest crediting rate	4.30%	4.50%	3.40%
Pension Benefits | Minimum
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Rate of compensation increase	0%	0%	0%
Pension Benefits | Maximum
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Rate of compensation increase	4.50%	3.50%	4.50%
Other Postretirement Benefits
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	5.50%	5.10%	5.40%
Interest crediting rate

Benefit Plans - Weighted Aver_2

Benefit Plans - Weighted Average Assumptions Used to Determine Net Periodic Benefit Cost (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pension Benefits
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	5%	5.20%	3.40%
Expected long-term rate of return on plan assets	6.10%	6.20%	6.30%
Interest crediting rate	4.50%	3.50%	3%
Pension Benefits | Minimum
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Rate of compensation increase	0%	0%	0%
Pension Benefits | Maximum
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Rate of compensation increase	3.50%	3.80%	3%
Other Postretirement Benefits
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	5.10%	5.40%	2.60%
Expected long-term rate of return on plan assets	3.30%	3%	2%
Interest crediting rate

Benefit Plans - Assumed Health

Benefit Plans - Assumed Health Care Cost Trend Rates (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Minimum
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
Health care cost trend rate assumed for next year	4%	4%	4%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)	4%	4%	4%
Year that the rate reaches the ultimate trend rate	2025	2024	2023
Maximum
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
Health care cost trend rate assumed for next year	8%	7%	6.50%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)	5.50%	5.50%	5.50%
Year that the rate reaches the ultimate trend rate	2029	2028	2026

Benefit Plans - Additional Info

Benefit Plans - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) participant	Dec. 31, 2023 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Unrecognized losses included in AOCI		$ 47
Unrecognized losses included in AOCI, after-tax		37
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Settlement Gain (Loss), Statement Of Income Or Comprehensive Income Extensible List Not Disclosed	true
Pre-tax pension settlement charge	$ 367
Pension settlement charge, after tax and noncontrolling interests	265
CNA Employee Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Payment for settlement	1,000
Amount transferred to the Insurer of the defined benefit obligation	$ 1,000
Number of plan participants and beneficiaries | participant	7,600
Defined benefit plan, plan participants and beneficiaries, percentage	60%
CNA Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Payment for settlement		80
Reduction in projected benefit obligation		86
Parent Company | Retirees and Certain Participants
Defined Benefit Plan Disclosure [Line Items]
Payment for settlement		66
Parent Company | Certain Other Participants
Defined Benefit Plan Disclosure [Line Items]
Payment for settlement		$ 34

Benefit Plans - Components of N

Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Settlements	$ 367
Pension Benefits
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	2	$ 2	$ 2
Interest cost	96	110	76
Expected return on plan assets	(119)	(125)	(165)
Amortization of unrecognized net loss	29	35	32
Settlements	372	48	5
Net periodic (benefit) cost	380	70	(50)
Other Postretirement Benefits
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost
Interest cost	2	2	1
Expected return on plan assets	(3)	(3)	(2)
Amortization of unrecognized net loss	1	1
Settlements
Net periodic (benefit) cost	$ 0	$ 0	$ (1)

Benefit Plans - Reconciliation

Benefit Plans - Reconciliation of Benefit Obligations and Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Change in benefit obligation [Roll Forward]
Actuarial (gain) loss	$ (29)
Pension Benefits
Change in benefit obligation [Roll Forward]
Benefit obligation, beginning balance	1,991	$ 2,220
Service cost	2	2	$ 2
Interest cost	96	110	76
Plan participants’ contributions
Actuarial (gain) loss	(29)	31
Benefits paid from plan assets	(149)	(181)
Settlements	(1,052)	(194)
Foreign exchange	(2)	3
Benefit obligation, ending balance	857	1,991	2,220
Change in plan assets [Roll Forward]
Fair value of plan assets, beginning balance	2,074	2,212
Actual return on plan assets	120	206
Company contributions	13	22
Plan participants' contributions
Benefits paid from plan assets	(149)	(181)
Settlements	(1,052)	(188)
Foreign exchange	(2)	3
Fair value of plan assets, ending balance	1,004	2,074	2,212
Funded status	147	83
Other Postretirement Benefits
Change in benefit obligation [Roll Forward]
Benefit obligation, beginning balance	34	33
Service cost
Interest cost	2	2	1
Plan participants’ contributions	2	3
Actuarial (gain) loss		6
Benefits paid from plan assets	(7)	(10)
Settlements
Foreign exchange
Benefit obligation, ending balance	31	34	33
Change in plan assets [Roll Forward]
Fair value of plan assets, beginning balance	83	81
Actual return on plan assets	3	5
Company contributions	2	4
Plan participants' contributions	2	3
Benefits paid from plan assets	(7)	(10)
Settlements
Foreign exchange
Fair value of plan assets, ending balance	83	83	$ 81
Funded status	$ 52	$ 49

Benefit Plans - Amounts Recogni

Benefit Plans - Amounts Recognized in the Consolidated Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Pension Benefits
Amounts recognized in the Consolidated Balance Sheets consist of [Abstract]
Other assets	$ 283	$ 229
Other liabilities	(136)	(146)
Net amount recognized	147	83
Other Postretirement Benefits
Amounts recognized in the Consolidated Balance Sheets consist of [Abstract]
Other assets	61	59
Other liabilities	(9)	(10)
Net amount recognized	$ 52	$ 49

Benefit Plans - Amounts Not Yet

Benefit Plans - Amounts Not Yet Recognized in Net Periodic (Benefit) Cost (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Pension Benefits
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Prior service credit	$ 1	$ 1
Net actuarial loss	241	672
Net amount recognized	242	673
Other Postretirement Benefits
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Prior service credit
Net actuarial loss	2	3
Net amount recognized	$ 2	$ 3

Benefit Plans - Plans With Proj

Benefit Plans - Plans With Projected and Accumulated Benefit Obligations in Excess of Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan, Additional Information [Abstract]
Accumulated benefit obligation for all defined benefit pension plans	$ 854	$ 2,000
Actuarial gain (loss)	29
Future capital calls from various third party limited partnership investments	$ 92
Defined Benefit Plan, Equity Securities | Minimum
Defined Benefit Plan, Additional Information [Abstract]
Target allocation of plan assets invested in equity securities and limited partnerships (as a percent)	0%
Defined Benefit Plan, Equity Securities | Maximum
Defined Benefit Plan, Additional Information [Abstract]
Target allocation of plan assets invested in equity securities and limited partnerships (as a percent)	40%
Pension Benefits
Information for plans with projected and accumulated benefit obligations in excess of plan assets:
Projected benefit obligation	$ 136	229
Accumulated benefit obligation	136	143
Fair value of plan assets	0	83
Defined Benefit Plan, Additional Information [Abstract]
Actuarial gain (loss)	29	(31)
Other Postretirement Benefits
Information for plans with projected and accumulated benefit obligations in excess of plan assets:
Projected benefit obligation
Accumulated benefit obligation	9	11
Fair value of plan assets
Defined Benefit Plan, Additional Information [Abstract]
Actuarial gain (loss)		$ (6)

Benefit Plans - Estimated Futur

Benefit Plans - Estimated Future Minimum Benefit Payments (Details) $ in Millions	Dec. 31, 2024 USD ($)
Pension Benefits
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2025	$ 86
2026	78
2027	81
2028	79
2029	72
2030 – 2034	310
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]
Expected contributions in 2025	16
Other Postretirement Benefits
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2025	3
2026	3
2027	3
2028	3
2029	2
2030 – 2034	10
Postretirement Healthcare and Life Insurance Benefit Plans
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]
Expected contributions in 2025	$ 1

Benefit Plans - Pension Plan As

Benefit Plans - Pension Plan Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Limited Partnership Investments [Abstract]
Percentage of carrying value of investments in private debt and equity	99%	93%
Percentage of carrying value of investments employing hedge fund strategies	1%	7%
Level 3
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	$ 0	$ 0
Hedge Funds, Equity Related
Limited Partnership Investments [Abstract]
Percentage of carrying value of investments in limited partnerships	100%
Hedge Funds, Multi-Strategy Approach Hedge Funds
Limited Partnership Investments [Abstract]
Percentage of carrying value of investments in limited partnerships	0%
Hedge Funds, Distressed Investments
Limited Partnership Investments [Abstract]
Percentage of carrying value of investments in limited partnerships	0%
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	$ 1,004	2,074	$ 2,212
Pension Benefits | Total
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	700	1,664
Pension Benefits | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	143	304
Pension Benefits | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	544	1,346
Pension Benefits | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	13	14
Pension Benefits | Total fixed maturities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	540	1,353
Pension Benefits | Total fixed maturities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	0	10
Pension Benefits | Total fixed maturities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	527	1,329
Pension Benefits | Total fixed maturities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	13	14
Pension Benefits | Corporate bonds and other
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	413	1,057
Pension Benefits | Corporate bonds and other | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total plan assets		10
Pension Benefits | Corporate bonds and other | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	408	1,041
Pension Benefits | Corporate bonds and other | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	5	6
Pension Benefits | States, municipalities and political subdivisions
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	6	55
Pension Benefits | States, municipalities and political subdivisions | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total plan assets
Pension Benefits | States, municipalities and political subdivisions | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	6	55
Pension Benefits | States, municipalities and political subdivisions | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total plan assets
Pension Benefits | Asset-backed
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	121	241
Pension Benefits | Asset-backed | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total plan assets
Pension Benefits | Asset-backed | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	113	233
Pension Benefits | Asset-backed | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	8	8
Pension Benefits | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	59	160
Pension Benefits | Equity securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	44	154
Pension Benefits | Equity securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	15	6
Pension Benefits | Equity securities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total plan assets
Pension Benefits | Short-term investments
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	59	114
Pension Benefits | Short-term investments | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	59	114
Pension Benefits | Short-term investments | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total plan assets
Pension Benefits | Short-term investments | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total plan assets
Pension Benefits | Fixed income mutual funds
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	40	26
Pension Benefits | Fixed income mutual funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	40	26
Pension Benefits | Fixed income mutual funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total plan assets
Pension Benefits | Fixed income mutual funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total plan assets
Pension Benefits | Other assets
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	2	11
Pension Benefits | Other assets | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total plan assets
Pension Benefits | Other assets | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	2	11
Pension Benefits | Other assets | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total plan assets
Pension Benefits | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets		$ 25
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible Enumeration]		Fair Value Measured at Net Asset Value Per Share [Member]
Pension Benefits | Limited partnerships
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	$ 304	$ 385
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible Enumeration]	Fair Value Measured at Net Asset Value Per Share [Member]	Fair Value Measured at Net Asset Value Per Share [Member]

Benefit Plans - Other Postretir

Benefit Plans - Other Postretirement Benefit Plan Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Level 3
Other Postretirement Benefits Plan Assets Measured at Fair Value on a Recurring Basis [Abstract]
Total plan assets	$ 0	$ 0
Other Postretirement Benefits
Other Postretirement Benefits Plan Assets Measured at Fair Value on a Recurring Basis [Abstract]
Total plan assets	83	83	$ 81
Other Postretirement Benefits | Total | Total assets
Other Postretirement Benefits Plan Assets Measured at Fair Value on a Recurring Basis [Abstract]
Total plan assets	101	122
Other Postretirement Benefits | Total | Total fixed maturities
Other Postretirement Benefits Plan Assets Measured at Fair Value on a Recurring Basis [Abstract]
Total plan assets	84	107
Other Postretirement Benefits | Total | Corporate bonds and other
Other Postretirement Benefits Plan Assets Measured at Fair Value on a Recurring Basis [Abstract]
Total plan assets	48	67
Other Postretirement Benefits | Total | States, municipalities and political subdivisions
Other Postretirement Benefits Plan Assets Measured at Fair Value on a Recurring Basis [Abstract]
Total plan assets	35	39
Other Postretirement Benefits | Total | Asset-backed
Other Postretirement Benefits Plan Assets Measured at Fair Value on a Recurring Basis [Abstract]
Total plan assets	1	1
Other Postretirement Benefits | Total | Short-term investments
Other Postretirement Benefits Plan Assets Measured at Fair Value on a Recurring Basis [Abstract]
Total plan assets	2	13
Other Postretirement Benefits | Total | Fixed income mutual funds
Other Postretirement Benefits Plan Assets Measured at Fair Value on a Recurring Basis [Abstract]
Total plan assets	15	2
Other Postretirement Benefits | Total | Other liabilities
Other Postretirement Benefits Plan Assets Measured at Fair Value on a Recurring Basis [Abstract]
Total plan assets	(18)	(39)
Other Postretirement Benefits | Level 1 | Total assets
Other Postretirement Benefits Plan Assets Measured at Fair Value on a Recurring Basis [Abstract]
Total plan assets	17	15
Other Postretirement Benefits | Level 1 | Total fixed maturities
Other Postretirement Benefits Plan Assets Measured at Fair Value on a Recurring Basis [Abstract]
Total plan assets	0	0
Other Postretirement Benefits | Level 1 | Corporate bonds and other
Other Postretirement Benefits Plan Assets Measured at Fair Value on a Recurring Basis [Abstract]
Total plan assets
Other Postretirement Benefits | Level 1 | States, municipalities and political subdivisions
Other Postretirement Benefits Plan Assets Measured at Fair Value on a Recurring Basis [Abstract]
Total plan assets
Other Postretirement Benefits | Level 1 | Asset-backed
Other Postretirement Benefits Plan Assets Measured at Fair Value on a Recurring Basis [Abstract]
Total plan assets
Other Postretirement Benefits | Level 1 | Short-term investments
Other Postretirement Benefits Plan Assets Measured at Fair Value on a Recurring Basis [Abstract]
Total plan assets	2	13
Other Postretirement Benefits | Level 1 | Fixed income mutual funds
Other Postretirement Benefits Plan Assets Measured at Fair Value on a Recurring Basis [Abstract]
Total plan assets	15	2
Other Postretirement Benefits | Level 1 | Other liabilities
Other Postretirement Benefits Plan Assets Measured at Fair Value on a Recurring Basis [Abstract]
Total plan assets	(18)	(39)
Other Postretirement Benefits | Level 2 | Total assets
Other Postretirement Benefits Plan Assets Measured at Fair Value on a Recurring Basis [Abstract]
Total plan assets	84	107
Other Postretirement Benefits | Level 2 | Total fixed maturities
Other Postretirement Benefits Plan Assets Measured at Fair Value on a Recurring Basis [Abstract]
Total plan assets	84	107
Other Postretirement Benefits | Level 2 | Corporate bonds and other
Other Postretirement Benefits Plan Assets Measured at Fair Value on a Recurring Basis [Abstract]
Total plan assets	48	67
Other Postretirement Benefits | Level 2 | States, municipalities and political subdivisions
Other Postretirement Benefits Plan Assets Measured at Fair Value on a Recurring Basis [Abstract]
Total plan assets	35	39
Other Postretirement Benefits | Level 2 | Asset-backed
Other Postretirement Benefits Plan Assets Measured at Fair Value on a Recurring Basis [Abstract]
Total plan assets	1	1
Other Postretirement Benefits | Level 2 | Short-term investments
Other Postretirement Benefits Plan Assets Measured at Fair Value on a Recurring Basis [Abstract]
Total plan assets
Other Postretirement Benefits | Level 2 | Fixed income mutual funds
Other Postretirement Benefits Plan Assets Measured at Fair Value on a Recurring Basis [Abstract]
Total plan assets
Other Postretirement Benefits | Level 2 | Other liabilities
Other Postretirement Benefits Plan Assets Measured at Fair Value on a Recurring Basis [Abstract]
Total plan assets
Other Postretirement Benefits | Level 3 | Total assets
Other Postretirement Benefits Plan Assets Measured at Fair Value on a Recurring Basis [Abstract]
Total plan assets	0	0
Other Postretirement Benefits | Level 3 | Total fixed maturities
Other Postretirement Benefits Plan Assets Measured at Fair Value on a Recurring Basis [Abstract]
Total plan assets	0	0
Other Postretirement Benefits | Level 3 | Corporate bonds and other
Other Postretirement Benefits Plan Assets Measured at Fair Value on a Recurring Basis [Abstract]
Total plan assets
Other Postretirement Benefits | Level 3 | States, municipalities and political subdivisions
Other Postretirement Benefits Plan Assets Measured at Fair Value on a Recurring Basis [Abstract]
Total plan assets
Other Postretirement Benefits | Level 3 | Asset-backed
Other Postretirement Benefits Plan Assets Measured at Fair Value on a Recurring Basis [Abstract]
Total plan assets
Other Postretirement Benefits | Level 3 | Short-term investments
Other Postretirement Benefits Plan Assets Measured at Fair Value on a Recurring Basis [Abstract]
Total plan assets
Other Postretirement Benefits | Level 3 | Fixed income mutual funds
Other Postretirement Benefits Plan Assets Measured at Fair Value on a Recurring Basis [Abstract]
Total plan assets
Other Postretirement Benefits | Level 3 | Other liabilities
Other Postretirement Benefits Plan Assets Measured at Fair Value on a Recurring Basis [Abstract]
Total plan assets

Benefit Plans - Savings Plans a

Benefit Plans - Savings Plans and Stock-based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2016
Share-based Payment Arrangement, Disclosure [Abstract]
Company matching contributions to savings plans	$ 110	$ 103	$ 90
Compensation expense	$ 39	$ 36	$ 34
SARs
Share-based Payment Arrangement, Disclosure [Abstract]
Vesting period	4 years
Expiration period	10 years
Units outstanding (in shares)	192,000
Weighted average exercise price (in dollars per share)	$ 38.59
RSUs
Share-based Payment Arrangement, Disclosure [Abstract]
Number of shares received (in shares)	1
Units forfeited (in shares)	0
RSUs | First 50%
Share-based Payment Arrangement, Disclosure [Abstract]
Vesting percentage	50%
RSUs | Second 50%
Share-based Payment Arrangement, Disclosure [Abstract]
Vesting percentage	50%
PSUs
Share-based Payment Arrangement, Disclosure [Abstract]
Number of shares received (in shares)	1
PSUs | First 50%
Share-based Payment Arrangement, Disclosure [Abstract]
Vesting percentage	50%
PSUs | Second 50%
Share-based Payment Arrangement, Disclosure [Abstract]
Vesting percentage	50%
RSUs and PSUs
Share-based Payment Arrangement, Disclosure [Abstract]
Units granted (in shares)	160,895
Weighted average grant date fair value (in dollars per share)	$ 73.38
2016 Loews Plan
Share-based Payment Arrangement, Disclosure [Abstract]
Number of shares authorized (in shares)				6,000,000
Number of shares that may be granted to any individual per calendar year (in shares)				500,000
2016 Loews Plan | Maximum
Share-based Payment Arrangement, Disclosure [Abstract]
Number of shares authorized (in shares)				3,000,000

Reinsurance - Receivables from

Reinsurance - Receivables from Reinsurers (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Reinsurance receivables related to insurance reserves:
Ceded claim and claim adjustment expenses	$ 5,713	$ 5,141
Reinsurance receivables related to paid losses	359	293
Reinsurance receivables	6,072	5,434
Less allowance for doubtful accounts	21	22
Reinsurance receivables, net of allowance for doubtful accounts	$ 6,051	$ 5,412

Reinsurance - Voluntary Reinsur

Reinsurance - Voluntary Reinsurance Receivables by Financial Strength (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Voluntary Reinsurance Receivables [Abstract]
Voluntary reinsurance receivables	$ 5,491
Reinsurance collateral	3,400	$ 3,600
Subsidiaries of Berkshire Hathaway Insurance Group
Voluntary Reinsurance Receivables [Abstract]
Voluntary reinsurance receivables	1,800
Cavello Bay Reinsurance Limited
Voluntary Reinsurance Receivables [Abstract]
Voluntary reinsurance receivables	559
Gateway Rivers Insurance Company
Voluntary Reinsurance Receivables [Abstract]
Voluntary reinsurance receivables	371
A- to A++
Voluntary Reinsurance Receivables [Abstract]
Voluntary reinsurance receivables	4,585
B- to B++
Voluntary Reinsurance Receivables [Abstract]
Voluntary reinsurance receivables	892
Insolvent
Voluntary Reinsurance Receivables [Abstract]
Voluntary reinsurance receivables	$ 14

Reinsurance - Effects of Reinsu

Reinsurance - Effects of Reinsurance on Earned Premiums (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Premiums Earned, Net [Abstract]
Direct	$ 15,025	$ 14,315	$ 13,524
Assumed	293	267	277
Ceded	5,107	5,102	5,134
Net	$ 10,211	$ 9,480	$ 8,667
Assumed/Net %	2.90%	2.80%	3.20%
Direct and ceded earned premiums	$ 2,700	$ 2,900	$ 3,300
Percentage reinsured under significant third party captive program	100%
Reinsurance recoveries	$ 3,500	2,800	2,600
Significant Third Party Captive Program
Premiums Earned, Net [Abstract]
Reinsurance recoveries	1,700	1,500	1,800
Property and casualty
Premiums Earned, Net [Abstract]
Direct	14,629	13,908	13,097
Assumed	252	223	231
Ceded	5,107	5,102	5,134
Net	$ 9,774	$ 9,029	$ 8,194
Assumed/Net %	2.60%	2.50%	2.80%
Long-term care
Premiums Earned, Net [Abstract]
Direct	$ 396	$ 407	$ 427
Assumed	41	44	46
Ceded
Net	$ 437	$ 451	$ 473
Assumed/Net %	9.40%	9.80%	9.70%

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	Dec. 31, 2024 USD ($)
CNA Financial
Commitments and Contingencies [Abstract]
Potential amount of future payments under guarantees	$ 1.4

Segments (Details)

Segments (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) Hotel subsidiary Segment mi	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Segments:
Number of reportable segments | Segment	4
Number of individual operating subsidiaries | subsidiary	3
Number of miles of natural gas and natural gas liquid pipelines | mi	14,315
Number of hotels | Hotel	25
Revenues:
Insurance premiums	$ 10,211	$ 9,480	$ 8,667
Net investment income (loss)	2,780	2,395	1,802
Investment gains (losses)	(81)	(53)	(199)
Non-insurance warranty revenue	1,609	1,624	1,574
Operating revenues and other	2,991	2,455	2,200
Total	17,510	15,901	14,044
Expenses:
Insurance claims and policyholders’ benefits	7,738	7,068	6,653
Amortization of deferred acquisition costs	1,798	1,644	1,490
Non-insurance warranty expense	1,547	1,544	1,471
Operating expenses and other	4,170	3,393	3,077
Equity method (income) loss	(58)	(120)	(139)
Interest	441	376	378
Total	15,636	13,905	12,930
Income (loss) before income tax	1,874	1,996	1,114
Income tax expense	(380)	(451)	(223)
Net income (loss)	1,494	1,545	891
Amounts attributable to noncontrolling interests	(80)	(111)	(69)
Net income (loss) attributable to Loews Corporation	1,414	1,434	822
Assets:
Assets	81,943	79,197
Pre-tax pension settlement charge	367
Unrecognized losses included in AOCI		47
Operating Expenses and Other:
Insurance related administrative expenses	1,275	1,251	1,160
Operating expenses and other	1,213	880	688
Depreciation and amortization	524	482	462
Other	1,158	780	767
Operating expenses and other	4,170	3,393	3,077
Property and casualty
Revenues:
Insurance premiums	9,774	9,029	8,194
Assets:
Loss from catastrophes		236	247
Total pretax (favorable) unfavorable development	48	48	(32)
CNA Financial
Revenues:
Insurance premiums	10,211	9,480	8,667
Net investment income (loss)	2,497	2,264	1,805
Investment gains (losses)	(81)	(99)	(199)
Non-insurance warranty revenue	1,609	1,624	1,574
Operating revenues and other	34	30	32
Total	14,270	13,299	11,879
Expenses:
Insurance claims and policyholders’ benefits	7,738	7,068	6,653
Amortization of deferred acquisition costs	1,798	1,644	1,490
Non-insurance warranty expense	1,547	1,544	1,471
Operating expenses and other	1,843	1,398	1,339
Equity method (income) loss
Interest	133	127	112
Total	13,059	11,781	11,065
Income (loss) before income tax	1,211	1,518	814
Income tax expense	(252)	(313)	(133)
Net income (loss)	959	1,205	681
Amounts attributable to noncontrolling interests	(80)	(111)	(69)
Net income (loss) attributable to Loews Corporation	879	1,094	612
Assets:
Assets	66,434	64,655
Operating Expenses and Other:
Insurance related administrative expenses	1,275	1,251	1,160
Operating expenses and other
Depreciation and amortization
Other	568	147	179
Operating expenses and other	1,843	1,398	1,339
CNA Financial | Property and casualty
Assets:
Loss from catastrophes	358
Total pretax (favorable) unfavorable development	48
Boardwalk Pipelines
Revenues:
Insurance premiums
Net investment income (loss)	32	11	3
Investment gains (losses)
Non-insurance warranty revenue
Operating revenues and other	2,033	1,625	1,443
Total	2,065	1,636	1,446
Expenses:
Insurance claims and policyholders’ benefits
Amortization of deferred acquisition costs
Non-insurance warranty expense
Operating expenses and other	1,377	1,108	950
Equity method (income) loss
Interest	183	155	166
Total	1,560	1,263	1,116
Income (loss) before income tax	505	373	330
Income tax expense	(92)	(90)	(83)
Net income (loss)	413	283	247
Amounts attributable to noncontrolling interests
Net income (loss) attributable to Loews Corporation	413	283	247
Assets:
Assets	9,853	9,785
Operating Expenses and Other:
Insurance related administrative expenses
Operating expenses and other	633	395	274
Depreciation and amortization	429	412	396
Other	315	301	280
Operating expenses and other	1,377	1,108	950
Lodging and related services – Loews Hotels & Co
Revenues:
Insurance premiums
Net investment income (loss)	9	6	1
Investment gains (losses)		46
Non-insurance warranty revenue
Operating revenues and other	924	800	720
Total	933	852	721
Expenses:
Insurance claims and policyholders’ benefits
Amortization of deferred acquisition costs
Non-insurance warranty expense
Operating expenses and other	873	767	697
Equity method (income) loss	(86)	(129)	(148)
Interest	51	14	11
Total	838	652	560
Income (loss) before income tax	95	200	161
Income tax expense	(25)	(53)	(44)
Net income (loss)	70	147	117
Amounts attributable to noncontrolling interests
Net income (loss) attributable to Loews Corporation	70	147	117
Assets:
Assets	2,498	2,374
Operating Expenses and Other:
Insurance related administrative expenses
Operating expenses and other	580	485	414
Depreciation and amortization	93	69	64
Other	200	213	219
Operating expenses and other	$ 873	767	697
Lodging and related services – Loews Hotels & Co | Lodging and related services – Loews Hotels & Co
Segments:
Number of hotels | Hotel	11
Lodging and related services – Loews Hotels & Co | Joint Ventures
Segments:
Number of hotels | Hotel	12
Lodging and related services – Loews Hotels & Co | Unaffiliated Owners
Segments:
Number of hotels | Hotel	2
Corporate
Revenues:
Insurance premiums
Net investment income (loss)	242	114	(7)
Investment gains (losses)
Non-insurance warranty revenue
Operating revenues and other			5
Total	242	114	(2)
Expenses:
Insurance claims and policyholders’ benefits
Amortization of deferred acquisition costs
Non-insurance warranty expense
Operating expenses and other	77	120	91
Equity method (income) loss	28	9	9
Interest	74	80	89
Total	179	209	189
Income (loss) before income tax	63	(95)	(191)
Income tax expense	(11)	5	37
Net income (loss)	52	(90)	(154)
Amounts attributable to noncontrolling interests
Net income (loss) attributable to Loews Corporation	52	(90)	(154)
Assets:
Assets	3,158	2,383
Operating Expenses and Other:
Insurance related administrative expenses
Operating expenses and other
Depreciation and amortization	2	1	2
Other	75	119	89
Operating expenses and other	$ 77	$ 120	$ 91
United States | Lodging and related services – Loews Hotels & Co
Segments:
Number of hotels | Hotel	24
Canada | Lodging and related services – Loews Hotels & Co
Segments:
Number of hotels | Hotel	1

Subsequent Event (Details)

Subsequent Event (Details) - Forecast - Subsequent Event - California Wildfires Estimates $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($)
Minimum
Subsequent Event [Line Items]
Loss from catastrophes	$ 40
Maximum
Subsequent Event [Line Items]
Loss from catastrophes	$ 70

Schedule I - Condensed Financ_2

Schedule I - Condensed Financial Information of Registrant, Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Assets:
Investments in securities	$ 51,130	$ 49,369
Other assets	4,181	4,147
Total assets	81,943	79,197
Liabilities and Equity:
Long-term debt	8,939	7,919
Total liabilities	64,006	62,672
Shareholders’ equity	17,066	15,704
Total liabilities and equity	81,943	79,197
Loews Corporation
Assets:
Current assets, principally investment in short-term instruments	2,222	2,149
Investments in securities	1,170	568
Investments in capital stocks of subsidiaries, at equity	15,623	14,889
Other assets	95	76
Total assets	19,110	17,682
Liabilities and Equity:
Current liabilities	143	102
Long-term debt	1,785	1,782
Deferred income tax and other	116	94
Total liabilities	2,044	1,978
Shareholders’ equity	17,066	15,704
Total liabilities and equity	$ 19,110	$ 17,682

Schedule I - Condensed Financ_3

Schedule I - Condensed Financial Information of Registrant, Statements of Operations and Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues:
Investment loss	$ (81)	$ (53)	$ (199)
Total	17,510	15,901	14,044
Expenses:
Interest	441	376	378
Total	15,636	13,905	12,930
Income (loss) before income tax	1,874	1,996	1,114
Income tax (expense) benefit	(380)	(451)	(223)
Net income (loss)	1,494	1,545	891
Total comprehensive income (loss) attributable to Loews Corporation	2,044	2,318	(1,178)
Loews Corporation
Revenues:
Equity in income of subsidiaries	1,328	1,501	963
Net investment income, interest and other	261	131	1
Investment loss
Total	1,589	1,632	964
Expenses:
Administrative	76	119	84
Interest	75	80	89
Total	151	199	173
Income (loss) before income tax	1,438	1,433	791
Income tax (expense) benefit	(24)	1	31
Net income (loss)	1,414	1,434	822
Equity in other comprehensive income (loss) of subsidiaries	630	884	(2,000)
Total comprehensive income (loss) attributable to Loews Corporation	$ 2,044	$ 2,318	$ (1,178)

Schedule I - Condensed Financ_4

Schedule I - Condensed Financial Information of Registrant, Statements of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Activities:
Net income	$ 1,494	$ 1,545	$ 891
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities:
Equity method investees	(66)	18	236
Provision (benefit) for deferred income taxes	(45)	127	(50)
Changes in operating assets and liabilities, net:
Receivables	(929)	(268)	(316)
Trading securities	(695)	577	159
Net cash flow provided by operating activities	3,025	3,907	3,314
Investing Activities:
Change in investments, primarily short-term	(30)	(80)	(27)
Other	(14)	(178)	(171)
Net cash flow used by investing activities	(1,975)	(2,745)	(2,347)
Financing Activities:
Dividends paid	(55)	(57)	(61)
Purchases of treasury shares	(608)	(849)	(729)
Payment of debt	(1,366)	(878)	(640)
Other	(58)	(18)	(16)
Net cash flow used by financing activities	(898)	(1,300)	(1,037)
Net change in cash	142	(133)	(89)
Cash, beginning of year	399	532	621
Cash, end of year	541	399	532
Loews Corporation
Operating Activities:
Net income	1,414	1,434	822
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities:
Equity method investees	(67)	(512)	(3)
Provision (benefit) for deferred income taxes	4	(4)	(49)
Changes in operating assets and liabilities, net:
Receivables	(6)	10	(11)
Accounts payable and accrued liabilities	(12)	(9)	(47)
Trading securities	(695)	576	153
Other, net	2	109	39
Net cash flow provided by operating activities	640	1,604	904
Investing Activities:
Investments in and advances to subsidiaries	2	(217)	(137)
Change in investments, primarily short-term	27	29	30
Other		(11)	(9)
Net cash flow used by investing activities	29	(199)	(116)
Financing Activities:
Dividends paid	(55)	(57)	(61)
Purchases of treasury shares	(608)	(849)	(729)
Payment of debt		(500)
Other	(4)	(5)	(7)
Net cash flow used by financing activities	(667)	(1,411)	(797)
Net change in cash	2	(6)	(9)
Cash, beginning of year	4	10	19
Cash, end of year	6	4	10
Cash dividends paid to Company by affiliates	$ 1,300	$ 1,000	$ 1,000

Schedule V - Supplemental Inf_2

Schedule V - Supplemental Information Concerning Property and Casualty Insurance Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Supplemental Information Concerning Property and Casualty Insurance Operations [Abstract]
Deferred acquisition costs	$ 959	$ 896
Reserves for unpaid claim and claim adjustment expenses	24,976	23,304
Discount deducted from claim and claim adjustment expense reserves above (based on interest rates ranging from 3.5% to 6.6%)	615	647
Unearned premiums	7,346	6,933
Net written premiums	10,605	9,892	$ 9,128
Net earned premiums	10,211	9,480	8,667
Net investment income	2,396	2,163	1,751
Incurred claim and claim adjustment expenses related to current year	6,330	5,667	5,181
Incurred claim and claim adjustment expenses related to prior years	42	48	(32)
Amortization of deferred acquisition costs	1,798	1,644	1,490
Paid claim and claim adjustment expenses	$ 5,189	$ 4,601	$ 4,302
Minimum
Supplemental Information Concerning Property and Casualty Insurance Operations [Abstract]
Interest rate at which discount computed	3.50%	3.50%
Maximum
Supplemental Information Concerning Property and Casualty Insurance Operations [Abstract]
Interest rate at which discount computed	6.60%	6.60%