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Claim and Claim Adjustment Expense Reserves (Tables)
 6 Months Ended
Jun. 30, 2026
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]  
Schedule of liability for unpaid claims and claims adjustment expense
The following table presents a reconciliation between beginning and ending claim and claim adjustment expense reserves.
For the six months ended June 30
(In millions)20262025
Reserves, beginning of year:
Gross$26,599 $24,976 
Ceded5,982 5,713 
Net reserves, beginning of year20,617 19,263 
Net incurred claim and claim adjustment expenses:
Provision for insured events of current year3,534 3,309 
Increase (decrease) in provision for insured events of prior years192 189 
Amortization of discount19 20 
Total net incurred (1)
3,745 3,518 
Net payments attributable to:
Current year events(345)(316)
Prior year events(2,499)(2,391)
Total net payments(2,844)(2,707)
Foreign currency translation adjustment and other(70)199 
Net reserves, end of period21,448 20,273 
Ceded reserves, end of period6,042 5,930 
Gross reserves, end of period$27,490 $26,203 
(1) Total net incurred does not agree to Insurance claims and policyholders' benefits as reflected on the Condensed Consolidated Statements of Operations due to amounts related to retroactive reinsurance deferred gain accounting, uncollectible reinsurance and benefit expenses related to future policy benefits and policyholders' dividends, which are not reflected in the table above.
Net prior year development The following table presents development recorded for the Specialty, Commercial, International and Corporate & Other segments.
Periods ended June 30Three MonthsSix Months
(In millions)2026202520262025
Pretax (favorable) unfavorable development:
Specialty$(1)$— $44 $10 
Commercial(5)(4)50 47 
International— — — — 
Corporate & Other97 11297 134
Total pretax (favorable) unfavorable development$91 $108 $191 $191 
Specialty  
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]  
Net prior year claim and allocated claim adjustment expense reserve development
The following table presents further detail of the development recorded for the Specialty segment.
Periods ended June 30Three MonthsSix Months
(In millions)2026202520262025
Pretax (favorable) unfavorable development:
Medical Professional Liability$— $— $— $— 
Other Professional Liability and Management Liability25 18 70 18 
Surety(26)(22)(26)(22)
Warranty— — — 10 
Other— 4 — 4 
Total pretax (favorable) unfavorable development$(1)$— $44 $10 
Commercial  
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]  
Net prior year claim and allocated claim adjustment expense reserve development
The following table presents further detail of the development recorded for the Commercial segment.
Periods ended June 30Three MonthsSix Months
(In millions)2026202520262025
Pretax (favorable) unfavorable development:
Commercial Auto$— $— $— $50 
General Liability56 62 111 62 
Workers' Compensation(32)(66)(32)(65)
Property and Other(29)— (29)— 
Total pretax (favorable) unfavorable development$(5)$(4)$50 $47 
International  
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]  
Net prior year claim and allocated claim adjustment expense reserve development
The following table presents further detail of the development recorded for the International segment.
Periods ended June 30Three MonthsSix Months
(In millions)2026202520262025
Pretax (favorable) unfavorable development:
Commercial$(15)$(3)$(15)$(3)
Specialty15 4 15 4 
Other— (1)— (1)
Total pretax (favorable) unfavorable development $— $— $— $— 
Three and Six Months