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Claim and Claim Adjustment Expense Reserves (Tables)
 9 Months Ended
Sep. 30, 2024
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract]  
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 nine months ended September 30
(In millions)20242023
Reserves, beginning of year:
Gross$23,304 $22,120 
Ceded5,141 5,191 
Net reserves, beginning of year18,163 16,929 
Net incurred claim and claim adjustment expenses:
Provision for insured events of current year4,706 4,221 
Increase (decrease) in provision for insured events of prior years26 43 
Amortization of discount30 33 
Total net incurred (1)
4,762 4,297 
Net payments attributable to:
Current year events(655)(588)
Prior year events(3,189)(2,953)
Total net payments(3,844)(3,541)
Foreign currency translation adjustment and other35 (30)
Net reserves, end of period19,116 17,655 
Ceded reserves, end of period5,4425,181 
Gross reserves, end of period$24,558 $22,836 
(1) Total net incurred does not agree to Insurance claims and policyholders' benefits as reflected on the Condensed Consolidated Statements of Operations due to amounts related to retroactive reinsurance deferred gain accounting, uncollectible reinsurance, benefit expenses related to future policy benefits and policyholders' dividends, which are not reflected in the table above.
Net prior year development The following table presents development recorded for the Specialty, Commercial, International and Corporate & Other segments.
Periods ended September 30Three MonthsNine Months
(In millions)2024202320242023
Pretax (favorable) unfavorable development:
Specialty$— $(5)$(8)$(9)
Commercial(3)(2)(11)(17)
International(2)— (5)15 
Corporate & Other22 20 57 55
Total pretax (favorable) unfavorable development$17 $13 $33 $44 
Net prior year claim and allocated claim adjustment expense reserve development
The following table presents further detail of the development recorded for the Specialty segment.
Periods ended September 30Three MonthsNine Months
(In millions)2024202320242023
Pretax (favorable) unfavorable development:
Medical Professional Liability$— $— $(2)$9 
Other Professional Liability and Management Liability11 17 28 16 
Surety(20)(21)(46)(28)
Warranty7 (2)20 (11)
Other2 1 (8)5 
Total pretax (favorable) unfavorable development$— $(5)$(8)$(9)
The following table presents further detail of the development recorded for the Commercial segment.
Periods ended September 30Three MonthsNine Months
(In millions)2024202320242023
Pretax (favorable) unfavorable development:
Commercial Auto$25 $— $46 $11 
General Liability28 — 47 70 
Workers' Compensation(57)(2)(106)(100)
Property and Other1 — 2 2 
Total pretax (favorable) unfavorable development$(3)$(2)$(11)$(17)
The following table presents further detail of the development recorded for the International segment.
Periods ended September 30Three MonthsNine Months
(In millions)2024202320242023
Pretax (favorable) unfavorable development:
Commercial$(13)$— $(7)$(5)
Specialty11 — 2 22 
Other— — — (2)
Total pretax (favorable) unfavorable development $(2)$— $(5)$15