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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, 2019
Insurance | Property and other  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 35.00%
Year 2 40.90%
Year 3 13.70%
Year 4 5.50%
Year 5 1.90%
Year 6 0.60%
Year 7 0.20%
Year 8 0.30%
Year 9 0.20%
Year 10 0.00%
Insurance | Marine  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 21.10%
Year 2 29.20%
Year 3 21.30%
Year 4 7.70%
Year 5 5.70%
Year 6 6.10%
Year 7 3.00%
Year 8 (1.10%)
Year 9 0.50%
Year 10 0.00%
Insurance | Aviation  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 24.80%
Year 2 27.40%
Year 3 19.40%
Year 4 10.40%
Year 5 8.10%
Year 6 2.70%
Year 7 2.90%
Year 8 0.70%
Year 9 1.40%
Year 10 2.10%
Insurance | Credit and political risk  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 22.60%
Year 2 33.60%
Year 3 4.00%
Year 4 3.40%
Year 5 11.30%
Year 6 5.30%
Year 7 0.30%
Year 8 0.00%
Year 9 0.20%
Year 10 (1.30%)
Insurance | Professional lines  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 4.70%
Year 2 12.80%
Year 3 16.60%
Year 4 13.90%
Year 5 11.40%
Year 6 9.50%
Year 7 7.60%
Year 8 2.80%
Year 9 7.00%
Year 10 3.40%
Insurance | Liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 3.10%
Year 2 12.90%
Year 3 13.80%
Year 4 19.30%
Year 5 11.80%
Year 6 7.60%
Year 7 5.70%
Year 8 6.00%
Year 9 3.60%
Year 10 0.40%
Reinsurance | Property and other  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 20.90%
Year 2 40.80%
Year 3 18.80%
Year 4 6.20%
Year 5 3.30%
Year 6 3.10%
Year 7 1.60%
Year 8 1.30%
Year 9 0.50%
Year 10 0.70%
Reinsurance | Professional lines  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 0.80%
Year 2 5.50%
Year 3 12.40%
Year 4 15.10%
Year 5 14.20%
Year 6 13.80%
Year 7 10.50%
Year 8 5.70%
Year 9 4.20%
Year 10 3.00%
Reinsurance | Liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 4.10%
Year 2 9.60%
Year 3 13.20%
Year 4 13.70%
Year 5 12.20%
Year 6 10.60%
Year 7 7.20%
Year 8 6.70%
Year 9 4.40%
Year 10 1.40%
Reinsurance | Credit and surety  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 30.20%
Year 2 28.80%
Year 3 14.60%
Year 4 6.60%
Year 5 3.90%
Year 6 2.10%
Year 7 2.40%
Year 8 1.50%
Year 9 0.70%
Year 10 0.60%
Reinsurance | Motor  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 22.30%
Year 2 16.40%
Year 3 10.10%
Year 4 6.90%
Year 5 5.50%
Year 6 4.70%
Year 7 3.00%
Year 8 1.00%
Year 9 1.40%
Year 10 2.80%