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RESERVE FOR CLAIMS AND CLAIM EXPENSES (Tables)
9 Months Ended
Sep. 30, 2023
Insurance Loss Reserves [Abstract]  
Schedule of Claims and Claim Expenses
The following table summarizes the Company’s reserve for claims and claim expenses by segment, allocated between case reserves, additional case reserves and IBNR:
At September 30, 2023Case
Reserves
Additional
Case Reserves
IBNRTotal
Property$1,944,257 $1,791,160 $2,647,186 $6,382,603 
Casualty and Specialty2,039,068 214,082 7,319,412 9,572,562 
Total
$3,983,325 $2,005,242 $9,966,598 $15,955,165 
At December 31, 2022
Property$1,956,688 $2,008,891 $3,570,253 $7,535,832 
Casualty and Specialty1,864,365 167,993 6,324,383 8,356,741 
Total
$3,821,053 $2,176,884 $9,894,636 $15,892,573 
Activity in the liability for unpaid claims and claim expenses is summarized as follows:
Nine months ended September 30,20232022
Reserve for claims and claim expenses, net of reinsurance recoverable, as of beginning of period$11,181,648 $9,025,961 
Net incurred related to:
Current year2,888,784 3,608,599 
Prior years(294,797)(92,696)
Total net incurred2,593,987 3,515,903 
Net paid related to:
Current year181,155 101,258 
Prior years1,880,700 1,454,977 
Total net paid2,061,855 1,556,235 
Foreign exchange (1)
(11,874)(291,918)
Reserve for claims and claim expenses, net of reinsurance recoverable, as of end of period11,701,906 10,693,711 
Reinsurance recoverable as of end of period4,253,259 4,969,244 
Reserve for claims and claim expenses as of end of period$15,955,165 $15,662,955 
(1)    Reflects the impact of the foreign exchange revaluation of the reserve for claims and claim expenses, net of reinsurance recoverable, denominated in non-U.S. dollars as at the balance sheet date.
The following table details the Company’s prior year net development by segment of its net claims and claim expenses:
Nine months ended September 30,20232022
(Favorable) adverse development(Favorable) adverse development
Property$(257,209)$(76,069)
Casualty and Specialty(37,588)(16,627)
Total net (favorable) adverse development of prior accident years net claims and claim expenses$(294,797)$(92,696)
The following tables detail the development of the Company’s liability for net unpaid claims and claim expenses for its Property segment, allocated between large and small catastrophe net claims and claim expenses and attritional net claims and claim expenses, included in the other line item:
Nine months ended September 30,2023
(Favorable) adverse development
Catastrophe net claims and claim expenses
Large catastrophe events
2022 Weather-Related Large Losses (1)
$6,501 
2021 Weather-Related Large Losses (2)
(24,931)
2020 Weather-Related Large Loss Events (3)
(28,824)
2019 Large Loss Events (4)
(37,934)
2018 Large Loss Events (5)
(37,847)
2017 Large Loss Events (6)
(31,922)
New Zealand Earthquake (2010)(10,397)
Other696 
Total large catastrophe events(164,658)
Small catastrophe events and attritional loss movements
Other small catastrophe events and attritional loss movements(93,391)
Actuarial assumption changes840 
Total small catastrophe events and attritional loss movements(92,551)
Total net (favorable) adverse development of prior accident years net claims and claim expenses$(257,209)
(1)“2022 Weather-Related Large Losses” includes Hurricane Ian, the floods in Eastern Australia in February and March of 2022, Storm Eunice, the severe weather in France in May and June of 2022, Hurricane Fiona and the typhoons in Asia during the third quarter of 2022, Hurricane Nicole and Winter Storm Elliott during the fourth quarter of 2022, and loss estimates associated with certain aggregate loss contracts triggered during 2022 as a result of weather-related catastrophe events.
(2)“2021 Weather-Related Large Losses” includes Winter Storm Uri, the European Floods, Hurricane Ida, the hail storm in Europe in late June 2021, the wildfires in California during the third quarter of 2021, the tornadoes in the Central and Midwest U.S. in December 2021, the Midwest Derecho in December 2021, and losses associated with aggregate loss contracts.
(3)“2020 Weather-Related Large Loss Events” includes Hurricanes Laura, Sally, Isaias, Delta, Zeta and Eta, the California, Oregon and Washington wildfires, Typhoon Maysak, the August 2020 Derecho, and losses associated with aggregate loss contracts.
(4)“2019 Large Loss Events” includes Hurricane Dorian and Typhoons Faxai and Hagibis and certain losses associated with aggregate loss contracts.
(5)“2018 Large Loss Events” includes Typhoons Jebi, Mangkhut and Trami, Hurricane Florence, the wildfires in California during the third and fourth quarters of 2018, Hurricane Michael and certain losses associated with aggregate loss contracts.
(6)“2017 Large Loss Events” includes Hurricanes Harvey, Irma and Maria, the Mexico City Earthquake, the wildfires in California during the fourth quarter of 2017 and certain losses associated with aggregate loss contracts.
Nine months ended September 30,2022
(Favorable) adverse development
Catastrophe net claims and claim expenses
Large catastrophe events
2021 Weather-Related Large Losses$42,766 
2020 Weather-Related Large Loss Events(32,988)
2019 Large Loss Events(50,148)
2018 Large Loss Events(15,493)
2017 Large Loss Events(28,722)
Other2,609 
Total large catastrophe events(81,976)
Small catastrophe events and attritional loss movements
Other small catastrophe events and attritional loss movements
5,907 
Total small catastrophe events and attritional loss movements5,907 
Total net (favorable) adverse development of prior accident years net claims and claim expenses$(76,069)
The following table details the development of the Company’s prior accident years net claims and claim expenses for its Casualty and Specialty segment:
Nine months ended September 30,20232022
(Favorable) adverse development(Favorable) adverse development
Actuarial methods - actual reported claims less than expected claims$(40,498)$(38,139)
Actuarial assumption changes
2,910 21,512 
Total net (favorable) adverse development of prior accident years net claims and claim expenses$(37,588)$(16,627)