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RESERVE FOR LOSSES AND LOSS EXPENSES
 3 Months Ended
Mar. 31, 2021
Insurance [Abstract]  
RESERVE FOR LOSSES AND LOSS EXPENSES
Reserve Roll-Forward

The following table presents a reconciliation of the Company's beginning and ending gross reserve for losses and loss expenses and net reserves for unpaid losses and loss expenses:
Three months ended March 31,
20212020
Gross reserve for losses and loss expenses, beginning of period$13,926,766 $12,752,081 
Less reinsurance recoverable on unpaid losses and loss expenses, beginning of period(4,496,641)(3,877,756)
Net reserve for unpaid losses and loss expenses, beginning of period9,430,125 8,874,325 
Net incurred losses and loss expenses related to:
Current year720,035 914,186 
Prior years(5,317)(6,113)
 714,718 908,073 
Net paid losses and loss expenses related to:
Current year(26,944)(19,081)
Prior years(666,139)(652,014)
 (693,083)(671,095)
Foreign exchange and other40,282 (130,609)
Net reserve for unpaid losses and loss expenses, end of period9,492,042 8,980,694 
Reinsurance recoverable on unpaid losses and loss expenses, end of period4,533,232 4,101,579 
Gross reserve for losses and loss expenses, end of period$14,025,274 $13,082,273 
The Company writes business with loss experience generally characterized as low frequency and high severity in nature, which can result in volatility in its financial results. During the three months ended March 31, 2021, the Company recognized catastrophe and weather-related losses, net of reinstatement premiums of $110 million (2020: $300 million).
At March 31, 2021, foreign exchange and other included a reduction in reinsurance recoverable on unpaid losses of $49 million related to the Reinsurance to Close of the 2018 year of account of Syndicate 2007.

Estimates for Significant Catastrophe Events

At March 31, 2021, net reserves for losses and loss expenses included estimated amounts for numerous catastrophe events. The magnitude and complexity of losses arising from certain of these events inherently increase the level of uncertainty and, therefore, the level of management judgment involved in arriving at estimated net reserves for losses and loss expenses. These events include the U.S. Winter Storms Uri and Viola in 2021, the COVID-19 pandemic, Hurricanes Laura, Sally, Zeta and Delta, the Midwest derecho and wildfires across the West Coast of the United States in 2020, Japanese Typhoons Hagibis, Faxai and Tapah, Hurricane Dorian and the Australia Wildfires in 2019 and Hurricanes Michael and Florence, California Wildfires and Typhoon Jebi in 2018. As a result, actual losses for these events may ultimately differ materially from current estimates.

Prior Year Reserve Development

The Company's net favorable prior year reserve development arises from changes to estimates of losses and loss expenses related to loss events that occurred in previous calendar years. The following table presents net prior year reserve development by segment:

  Three months ended March 31,
  20212020
Favorable (Adverse)Favorable (Adverse)
Insurance$1,505 $3,832 
Reinsurance3,812 2,281 
Total$5,317 $6,113 

The following sections provide further details on net prior year reserve development by segment, reserving class and accident year.
Insurance Segment:

The following table maps lines of business to reserve classes and the expected claim tails:
Insurance segment
Reserve class and tail
Property and otherMarineAviationCredit and political riskProfessional linesLiability
ShortShortShort/MediumMediumMediumLong
Reported lines of business
PropertyX
MarineX
TerrorismX
AviationX
Credit and political riskX
Professional linesX
LiabilityX
Accident and healthX
Discontinued lines - NovaeXXX

Prior year reserve development by reserve class was as follows:
  Three months ended March 31,
  20212020
Favorable (Adverse)Favorable (Adverse)
Property and other$15,391 $12,491 
Marine11,875 (2,202)
Aviation1,035 3,991 
Credit and political risk(5,371)(916)
Professional lines(14,593)(5,087)
Liability(6,832)(4,445)
Total$1,505 $3,832 

For the three months ended March 31, 2021, we recognized $2 million of net favorable prior year reserve development, the principal components of which were: 
•$15 million of net favorable prior year reserve development on property and other business primarily due to better than expected loss emergence attributable to the 2017, 2019 and 2020 catastrophe events.
•$12 million of net favorable prior year reserve development on marine business primarily due better than expected loss emergence attributable to cargo and energy offshore books of business mainly related to the 2017 and 2020 accident years.
•$15 million of net adverse prior year reserve development on professional lines business primarily due to reserve strengthening within the commercial management solutions, European program and European management liability solutions books of business mainly related to the 2018 accident year.
•$7 million of net adverse prior year reserve development on liability business primarily due to reserve strengthening within the program book of business mainly related to the 2018 accident year.
For the three months ended March 31, 2020, we recognized $4 million of net favorable prior year reserve development, the principal components of which were: 
•$12 million of net favorable prior year reserve development on property and other business primarily due to better than expected loss emergence attributable to the 2017 and 2018 catastrophe events.
•$5 million of net adverse prior year reserve development on professional lines business primarily due to reserve strengthening related to the 2016 and 2017 accident years.

Reinsurance Segment:

The following table maps lines of business to reserve classes and the expected claim tails:
Reinsurance segment
Reserve class and tail
Property and otherCredit and suretyProfessional linesMotorLiability
ShortMediumMediumLongLong
Reported lines of business
CatastropheX
PropertyX
Credit and suretyX
Professional linesX
MotorX
LiabilityX
EngineeringX
AgricultureX
Marine and aviationX
Accident and healthX
Discontinued lines - NovaeXXX

Prior year reserve development by reserve class was as follows:
  Three months ended March 31,
  20212020
Property and other$969 $(3,905)
Credit and surety(4,939)4,854 
Professional lines(2,204)5,162 
Motor17,140 13,085 
Liability(7,154)(16,915)
Total$3,812 $2,281 

For the three months ended March 31, 2021, we recognized $4 million of net favorable prior year reserve development, the principal components of which were:
•$17 million of net favorable prior year reserve development on motor business primarily due to non-proportional treaty business related to several accident years.
•$7 million of net adverse prior year reserve development on liability business primarily due to an increase in the loss estimate attributable to a specific large loss related to the 2017 accident year.
•$5 million of net adverse prior year reserve development on credit and surety business primarily due to an increase in the loss estimate attributable to a specific large loss related to the 2020 accident year.
For the three months ended March 31, 2020, we recognized $2 million of net favorable prior year reserve development, the principal components of which were:
•$13 million of net favorable prior year reserve development on motor business primarily due to non-proportional treaty business related to 2014 and prior accident years.
•$5 million of net favorable prior year reserve development on professional lines business reflecting generally favorable experience on older accident years as the Company continued to transition to more experience based actuarial methods.
•$5 million of net favorable prior year reserve development on credit and surety business primarily due to better than expected loss emergence related to the 2016 accident year.
•$17 million of net adverse prior year development on liability business primarily due to reserve strengthening within the European proportional and non-proportional books of business and the U.S. proportional book of business related to the 2016 and 2017 accident years.