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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, 2023
Insurance | Property  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 32.90%
Year 2 41.20%
Year 3 13.40%
Year 4 5.30%
Year 5 0.10%
Year 6 0.40%
Year 7 (1.30%)
Year 8 1.80%
Year 9 (0.10%)
Year 10 (0.10%)
Insurance | Accident and health  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 53.00%
Year 2 34.90%
Year 3 6.00%
Year 4 1.90%
Year 5 0.90%
Year 6 0.20%
Year 7 0.80%
Year 8 (0.90%)
Year 9 (1.40%)
Year 10 1.00%
Insurance | Marine and aviation  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 18.80%
Year 2 26.60%
Year 3 22.50%
Year 4 7.90%
Year 5 5.60%
Year 6 3.80%
Year 7 3.80%
Year 8 (3.20%)
Year 9 1.80%
Year 10 0.20%
Insurance | Cyber  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 10.70%
Year 2 23.50%
Year 3 19.00%
Year 4 18.50%
Year 5 6.20%
Year 6 6.50%
Year 7 1.30%
Year 8 3.30%
Year 9 2.60%
Year 10 4.80%
Insurance | Professional lines  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 3.90%
Year 2 11.30%
Year 3 16.10%
Year 4 13.30%
Year 5 11.70%
Year 6 11.10%
Year 7 6.20%
Year 8 5.20%
Year 9 5.40%
Year 10 2.70%
Insurance | Credit and political risk  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 9.30%
Year 2 59.00%
Year 3 10.00%
Year 4 0.60%
Year 5 3.60%
Year 6 3.70%
Year 7 (2.80%)
Year 8 0.00%
Year 9 (0.40%)
Year 10 0.00%
Insurance | Liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 3.20%
Year 2 10.80%
Year 3 15.30%
Year 4 19.60%
Year 5 12.80%
Year 6 10.10%
Year 7 8.50%
Year 8 4.10%
Year 9 3.60%
Year 10 2.50%
Reinsurance | Accident and health  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 37.10%
Year 2 48.70%
Year 3 12.90%
Year 4 0.30%
Year 5 0.40%
Year 6 0.20%
Year 7 0.70%
Year 8 (0.50%)
Year 9 (0.50%)
Year 10 0.50%
Reinsurance | Marine and aviation  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 8.90%
Year 2 26.40%
Year 3 20.50%
Year 4 14.40%
Year 5 10.70%
Year 6 3.70%
Year 7 1.90%
Year 8 1.70%
Year 9 1.60%
Year 10 9.30%
Reinsurance | Professional lines  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 1.50%
Year 2 5.30%
Year 3 11.60%
Year 4 12.30%
Year 5 12.60%
Year 6 12.30%
Year 7 7.90%
Year 8 7.70%
Year 9 5.10%
Year 10 2.70%
Reinsurance | Liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 4.50%
Year 2 9.80%
Year 3 10.80%
Year 4 12.20%
Year 5 11.10%
Year 6 10.00%
Year 7 7.90%
Year 8 5.70%
Year 9 6.40%
Year 10 4.20%
Reinsurance | Credit and surety  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 26.50%
Year 2 22.10%
Year 3 15.00%
Year 4 8.60%
Year 5 2.30%
Year 6 2.00%
Year 7 0.40%
Year 8 0.20%
Year 9 (0.40%)
Year 10 (8.20%)
Reinsurance | Motor  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 23.60%
Year 2 18.80%
Year 3 10.30%
Year 4 6.50%
Year 5 6.30%
Year 6 5.60%
Year 7 4.10%
Year 8 6.30%
Year 9 1.40%
Year 10 2.00%
Reinsurance | Agriculture  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 10.90%
Year 2 63.50%
Year 3 18.50%
Year 4 1.70%
Year 5 (0.60%)
Year 6 0.90%
Year 7 (0.40%)
Year 8 0.40%
Year 9 0.60%
Year 10 0.10%
Reinsurance | Run-off lines  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 21.80%
Year 2 32.40%
Year 3 17.90%
Year 4 9.70%
Year 5 4.90%
Year 6 2.90%
Year 7 2.10%
Year 8 1.10%
Year 9 0.50%
Year 10 0.60%