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Claim and Claim Adjustment Expense Reserves (Tables)
 6 Months Ended
Jun. 30, 2021
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, including claim and claim adjustment expense reserves of the Life & Group segment.
For the six months ended June 30
(In millions)20212020
Reserves, beginning of year:
Gross$22,706 $21,720 
Ceded4,005 3,835 
Net reserves, beginning of year18,701 17,885 
Reduction of net reserves due to Excess Workers' Compensation Loss Portfolio Transfer(632)— 
Net incurred claim and claim adjustment expenses:
Provision for insured events of current year2,930 2,899 
Increase (decrease) in provision for insured events of prior years(78)19 
Amortization of discount95 98 
Total net incurred (1)
2,947 3,016 
Net payments attributable to:
Current year events(317)(256)
Prior year events(1,949)(2,342)
Total net payments(2,266)(2,598)
Foreign currency translation adjustment and other(5)(35)
Net reserves, end of period18,745 18,268 
Ceded reserves, end of period4,735 4,002 
Gross reserves, end of period$23,480 $22,270 
(1) Total net incurred above does not agree to Insurance claims and policyholders' benefits as reflected on the Condensed Consolidated Statements of Operations due to amounts related to retroactive reinsurance deferred gain accounting, the loss on the Excess Workers' Compensation Loss Portfolio Transfer, uncollectible reinsurance and benefit expenses related to future policy benefits, which are not reflected in the table above.
Net prior year development The following table presents development recorded for the Specialty, Commercial, International and Corporate & Other segments.
Periods ended June 30Three MonthsSix Months
(In millions)2021202020212020
Pretax (favorable) unfavorable development:
Specialty$(10)$(20)$(25)$(31)
Commercial— (5)— (9)
International(1)(3)(1)(3)
Corporate & Other40 50 40 50 
Total pretax (favorable) unfavorable development$29 $22 $14 $7 
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)2021202020212020
Pretax (favorable) unfavorable development:
Casualty$1 $(6)$1 $(6)
Property, Energy and Marine(3)1 (3)1 
Specialty1 2 1 2 
Total pretax (favorable) unfavorable development $(1)$(3)$(1)$(3)
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)2021202020212020
Pretax (favorable) unfavorable development:
Medical Professional Liability$— $— $8 $10 
Other Professional Liability and Management Liability10 (9)10 (6)
Surety(23)— (38)(30)
Warranty— (3)(8)(3)
Other3 (8)3 (2)
Total pretax (favorable) unfavorable development$(10)$(20)$(25)$(31)
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)2021202020212020
Pretax (favorable) unfavorable development:
Commercial Auto$30 $15 $30 $24 
General Liability— — — — 
Workers' Compensation(42)(61)(42)(74)
Property and Other12 41 12 41 
Total pretax (favorable) unfavorable development$— $(5)$— $(9)