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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, 2021
Insurance | Property and other  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 35.30%
Year 2 40.80%
Year 3 13.70%
Year 4 3.80%
Year 5 1.30%
Year 6 1.50%
Year 7 (0.90%)
Year 8 0.70%
Year 9 0.90%
Year 10 0.00%
Insurance | Marine  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 17.20%
Year 2 29.20%
Year 3 23.60%
Year 4 7.20%
Year 5 5.80%
Year 6 6.40%
Year 7 3.00%
Year 8 (4.30%)
Year 9 0.90%
Year 10 3.50%
Insurance | Aviation  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 27.60%
Year 2 26.10%
Year 3 15.90%
Year 4 11.10%
Year 5 6.90%
Year 6 3.30%
Year 7 1.20%
Year 8 2.80%
Year 9 0.10%
Year 10 0.10%
Insurance | Credit and political risk  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 7.50%
Year 2 52.20%
Year 3 11.30%
Year 4 1.20%
Year 5 21.50%
Year 6 5.90%
Year 7 3.30%
Year 8 0.00%
Year 9 (6.70%)
Year 10 0.00%
Insurance | Professional lines  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 5.30%
Year 2 13.90%
Year 3 17.30%
Year 4 15.40%
Year 5 10.60%
Year 6 8.00%
Year 7 4.90%
Year 8 4.40%
Year 9 4.60%
Year 10 1.50%
Insurance | Liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 3.50%
Year 2 12.30%
Year 3 15.30%
Year 4 20.70%
Year 5 12.80%
Year 6 9.10%
Year 7 6.00%
Year 8 2.10%
Year 9 2.80%
Year 10 0.30%
Reinsurance | Property and other  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 21.10%
Year 2 42.30%
Year 3 17.80%
Year 4 6.00%
Year 5 2.50%
Year 6 1.20%
Year 7 0.90%
Year 8 1.40%
Year 9 0.60%
Year 10 0.90%
Reinsurance | Credit and surety  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 28.90%
Year 2 26.20%
Year 3 14.10%
Year 4 8.40%
Year 5 2.70%
Year 6 1.60%
Year 7 1.50%
Year 8 1.00%
Year 9 (0.60%)
Year 10 (0.80%)
Reinsurance | Professional lines  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 1.20%
Year 2 5.80%
Year 3 13.20%
Year 4 14.90%
Year 5 13.40%
Year 6 12.20%
Year 7 9.30%
Year 8 6.20%
Year 9 3.70%
Year 10 4.80%
Reinsurance | Motor  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 23.80%
Year 2 19.90%
Year 3 11.00%
Year 4 7.20%
Year 5 6.00%
Year 6 4.90%
Year 7 3.20%
Year 8 2.00%
Year 9 2.00%
Year 10 9.00%
Reinsurance | Liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 4.50%
Year 2 9.90%
Year 3 12.80%
Year 4 14.20%
Year 5 12.20%
Year 6 10.90%
Year 7 8.00%
Year 8 5.70%
Year 9 4.00%
Year 10 1.20%