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Claim and Claim Adjustment Expense Reserves (Tables)
 3 Months Ended
Mar. 31, 2024
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.
Three months ended March 31
(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 year1,502 1,326 
Increase (decrease) in provision for insured events of prior years(6)13 
Amortization of discount10 11 
Total net incurred (1)
1,506 1,350 
Net payments attributable to:
Current year events(113)(72)
Prior year events(1,168)(1,042)
Total net payments(1,281)(1,114)
Foreign currency translation adjustment and other(41)35 
Net reserves, end of period18,347 17,200 
Ceded reserves, end of period5,2415,209 
Gross reserves, end of period$23,588 $22,409 
(1) Total net incurred does not agree to Insurance claims and policyholders' benefits as reflected on the Condensed Consolidated Statements of Operations due to amounts related to retroactive reinsurance deferred gain accounting, uncollectible reinsurance, benefit expenses related to future policy benefits and policyholders' dividends, which are not reflected in the table above.
Net prior year development The following table presents development recorded for the Specialty, Commercial, International and Corporate & Other segments.
Three months ended March 31
(In millions)20242023
Pretax (favorable) unfavorable development:
Specialty$(5)$— 
Commercial(2)(2)
International— 15 
Corporate & Other— —
Total pretax (favorable) unfavorable development$(7)$13 
Net prior year claim and allocated claim adjustment expense reserve development
The following table presents further detail of the development recorded for the Specialty segment.
Three months ended March 31
(In millions)20242023
Pretax (favorable) unfavorable development:
Medical Professional Liability$— $9 
Other Professional Liability and Management Liability— — 
Surety(18)— 
Warranty13 (9)
Other— — 
Total pretax (favorable) unfavorable development$(5)$— 
The following table presents further detail of the development recorded for the Commercial segment.
Three months ended March 31
(In millions)20242023
Pretax (favorable) unfavorable development:
Commercial Auto$— $— 
General Liability— — 
Workers' Compensation(2)(2)
Property and Other— — 
Total pretax (favorable) unfavorable development$(2)$(2)
The following table presents further detail of the development recorded for the International segment.
Three months ended March 31
(In millions)20242023
Pretax (favorable) unfavorable development:
Commercial$— $(2)
Specialty— 19 
Other— (2)
Total pretax (favorable) unfavorable development $— $15