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RESERVE FOR LOSSES AND LOSS EXPENSES - Average annual percentage payout of incurred claims by age, net of reinsurance (Details)
Dec. 31, 2020
Insurance | Property and other  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 34.00%
Year 2 40.80%
Year 3 14.60%
Year 4 4.70%
Year 5 1.30%
Year 6 1.10%
Year 7 0.00%
Year 8 0.70%
Year 9 0.10%
Year 10 0.00%
Insurance | Marine  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 19.80%
Year 2 29.70%
Year 3 22.50%
Year 4 7.00%
Year 5 5.30%
Year 6 6.30%
Year 7 3.20%
Year 8 2.10%
Year 9 0.50%
Year 10 0.00%
Insurance | Aviation  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 25.80%
Year 2 26.80%
Year 3 18.10%
Year 4 11.40%
Year 5 7.60%
Year 6 3.50%
Year 7 2.00%
Year 8 3.30%
Year 9 0.40%
Year 10 0.10%
Insurance | Credit and political risk  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 18.30%
Year 2 39.10%
Year 3 5.20%
Year 4 2.90%
Year 5 11.90%
Year 6 5.20%
Year 7 2.40%
Year 8 0.00%
Year 9 0.00%
Year 10 0.00%
Insurance | Professional lines  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 4.90%
Year 2 13.30%
Year 3 17.20%
Year 4 14.80%
Year 5 12.10%
Year 6 10.80%
Year 7 7.00%
Year 8 3.10%
Year 9 3.60%
Year 10 4.40%
Insurance | Liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 3.30%
Year 2 13.00%
Year 3 14.50%
Year 4 20.50%
Year 5 12.10%
Year 6 9.00%
Year 7 6.20%
Year 8 2.00%
Year 9 3.10%
Year 10 5.80%
Reinsurance | Property and other  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 20.80%
Year 2 41.80%
Year 3 18.40%
Year 4 6.30%
Year 5 2.60%
Year 6 2.50%
Year 7 0.60%
Year 8 1.40%
Year 9 1.00%
Year 10 0.40%
Reinsurance | Credit and surety  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 29.70%
Year 2 29.10%
Year 3 13.90%
Year 4 7.90%
Year 5 3.60%
Year 6 2.30%
Year 7 1.90%
Year 8 1.60%
Year 9 0.60%
Year 10 0.70%
Reinsurance | Professional lines  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 1.00%
Year 2 5.80%
Year 3 13.00%
Year 4 15.10%
Year 5 13.90%
Year 6 12.10%
Year 7 9.60%
Year 8 5.40%
Year 9 4.40%
Year 10 0.90%
Reinsurance | Motor  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 22.10%
Year 2 18.20%
Year 3 11.00%
Year 4 7.70%
Year 5 6.10%
Year 6 5.00%
Year 7 3.40%
Year 8 1.20%
Year 9 1.50%
Year 10 1.70%
Reinsurance | Liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 4.50%
Year 2 9.50%
Year 3 12.40%
Year 4 14.30%
Year 5 11.90%
Year 6 11.00%
Year 7 8.10%
Year 8 6.60%
Year 9 4.20%
Year 10 4.50%