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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, 2018
Insurance | Property and other  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 34.50%
Year 2 40.20%
Year 3 13.20%
Year 4 5.80%
Year 5 2.00%
Year 6 0.80%
Year 7 0.70%
Year 8 0.20%
Year 9 0.30%
Year 10 0.00%
Insurance | Marine  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 21.90%
Year 2 27.30%
Year 3 20.80%
Year 4 7.20%
Year 5 6.20%
Year 6 4.10%
Year 7 4.00%
Year 8 (1.50%)
Year 9 0.50%
Year 10 2.60%
Insurance | Aviation  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 22.30%
Year 2 24.80%
Year 3 20.00%
Year 4 15.50%
Year 5 8.60%
Year 6 3.10%
Year 7 2.30%
Year 8 (0.10%)
Year 9 1.00%
Year 10 (0.40%)
Insurance | Credit and political risk  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 21.70%
Year 2 38.90%
Year 3 1.60%
Year 4 3.10%
Year 5 9.90%
Year 6 3.30%
Year 7 0.40%
Year 8 0.00%
Year 9 (0.50%)
Year 10 (0.10%)
Insurance | Professional lines  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 4.10%
Year 2 11.80%
Year 3 15.70%
Year 4 13.40%
Year 5 11.60%
Year 6 9.10%
Year 7 8.20%
Year 8 7.70%
Year 9 8.60%
Year 10 3.20%
Insurance | Liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 2.80%
Year 2 11.80%
Year 3 12.90%
Year 4 19.40%
Year 5 10.00%
Year 6 8.10%
Year 7 5.00%
Year 8 19.00%
Year 9 1.30%
Year 10 1.30%
Reinsurance | Property and other  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 22.20%
Year 2 39.90%
Year 3 19.10%
Year 4 6.50%
Year 5 3.80%
Year 6 2.90%
Year 7 1.90%
Year 8 0.70%
Year 9 0.00%
Year 10 (0.90%)
Reinsurance | Credit and surety  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 29.90%
Year 2 30.00%
Year 3 12.60%
Year 4 5.50%
Year 5 4.30%
Year 6 1.90%
Year 7 1.30%
Year 8 0.90%
Year 9 0.50%
Year 10 (0.40%)
Reinsurance | Professional lines  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 0.90%
Year 2 5.90%
Year 3 12.10%
Year 4 14.40%
Year 5 13.30%
Year 6 12.70%
Year 7 10.50%
Year 8 5.20%
Year 9 3.80%
Year 10 3.90%
Reinsurance | Motor  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 19.50%
Year 2 14.10%
Year 3 8.60%
Year 4 5.80%
Year 5 4.70%
Year 6 4.90%
Year 7 3.00%
Year 8 2.60%
Year 9 2.80%
Year 10 3.20%
Reinsurance | Liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 3.40%
Year 2 9.20%
Year 3 13.10%
Year 4 12.00%
Year 5 11.20%
Year 6 11.60%
Year 7 8.10%
Year 8 5.20%
Year 9 4.50%
Year 10 2.00%