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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, 2017
Insurance | Property and Other  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 34.40%
Year 2 40.60%
Year 3 12.20%
Year 4 5.40%
Year 5 3.60%
Year 6 0.80%
Year 7 0.90%
Year 8 0.10%
Year 9 0.20%
Year 10 (0.20%)
Insurance | Marine  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 22.60%
Year 2 28.60%
Year 3 18.80%
Year 4 8.30%
Year 5 3.10%
Year 6 2.30%
Year 7 3.30%
Year 8 (2.30%)
Year 9 0.40%
Year 10 0.00%
Insurance | Aviation  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 18.70%
Year 2 24.40%
Year 3 19.40%
Year 4 15.50%
Year 5 9.50%
Year 6 3.00%
Year 7 2.80%
Year 8 2.60%
Year 9 1.50%
Year 10 (0.10%)
Insurance | Credit and Political Risk  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 18.80%
Year 2 54.10%
Year 3 (4.30%)
Year 4 3.30%
Year 5 20.30%
Year 6 1.10%
Year 7 (0.50%)
Year 8 0.00%
Year 9 (0.70%)
Year 10 (0.60%)
Insurance | Professional Lines  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 3.70%
Year 2 10.90%
Year 3 14.70%
Year 4 14.50%
Year 5 12.50%
Year 6 8.90%
Year 7 8.90%
Year 8 10.50%
Year 9 5.60%
Year 10 0.30%
Insurance | Liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 2.50%
Year 2 11.30%
Year 3 13.20%
Year 4 16.20%
Year 5 10.10%
Year 6 8.70%
Year 7 4.80%
Year 8 19.40%
Year 9 3.60%
Year 10 27.10%
Reinsurance | Property and Other  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 20.60%
Year 2 36.60%
Year 3 20.80%
Year 4 7.40%
Year 5 4.20%
Year 6 3.00%
Year 7 1.80%
Year 8 0.90%
Year 9 (0.90%)
Year 10 (0.30%)
Reinsurance | Credit and Surety  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 27.30%
Year 2 32.20%
Year 3 10.90%
Year 4 6.00%
Year 5 3.50%
Year 6 2.00%
Year 7 1.70%
Year 8 0.70%
Year 9 0.30%
Year 10 0.20%
Reinsurance | Professional Lines  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 0.80%
Year 2 5.30%
Year 3 11.10%
Year 4 13.90%
Year 5 12.40%
Year 6 12.50%
Year 7 9.60%
Year 8 6.20%
Year 9 4.00%
Year 10 3.70%
Reinsurance | Motor  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 16.80%
Year 2 13.20%
Year 3 7.60%
Year 4 5.00%
Year 5 4.10%
Year 6 4.80%
Year 7 3.60%
Year 8 2.70%
Year 9 3.20%
Year 10 0.70%
Reinsurance | Liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 2.90%
Year 2 8.90%
Year 3 13.00%
Year 4 11.30%
Year 5 10.60%
Year 6 11.60%
Year 7 8.50%
Year 8 3.80%
Year 9 4.00%
Year 10 6.80%