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Short Duration Contracts - Percentage annual payout - all segments (Details)
Dec. 31, 2023
Insurance | Property, energy, marine and aviation  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 20.50%
Year Two 43.70%
Year Three 18.10%
Year Four 6.00%
Year Five 2.20%
Year Six 1.00%
Year Seven 2.60%
Year Eight 1.90%
Year Nine (0.40%)
Year Ten 1.50%
Insurance | Third party occurrence business  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 3.50%
Year Two 9.40%
Year Three 11.50%
Year Four 11.40%
Year Five 9.90%
Year Six 9.80%
Year Seven 5.60%
Year Eight 4.60%
Year Nine 4.40%
Year Ten 5.60%
Insurance | Third party claims-made business  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 4.10%
Year Two 15.50%
Year Three 16.50%
Year Four 11.10%
Year Five 14.30%
Year Six 10.10%
Year Seven 6.30%
Year Eight 5.20%
Year Nine 5.70%
Year Ten 2.00%
Insurance | Multi-line and other specialty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 34.00%
Year Two 29.30%
Year Three 11.30%
Year Four 8.20%
Year Five 4.50%
Year Six 2.90%
Year Seven 1.10%
Year Eight 0.40%
Year Nine 0.40%
Year Ten 0.50%
Reinsurance | Casualty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 2.80%
Year Two 7.70%
Year Three 12.10%
Year Four 10.40%
Year Five 11.40%
Year Six 8.50%
Year Seven 7.80%
Year Eight 5.30%
Year Nine 5.20%
Year Ten 2.90%
Reinsurance | Property catastrophe  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 56.00%
Year Two (17.50%)
Year Three 47.20%
Year Four (41.90%)
Year Five (6.20%)
Year Six 10.90%
Year Seven 2.40%
Year Eight 1.10%
Year Nine (1.70%)
Year Ten 0.00%
Reinsurance | Property excluding property catastrophe  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 25.00%
Year Two 38.20%
Year Three 14.20%
Year Four 6.00%
Year Five 4.40%
Year Six 0.20%
Year Seven 0.70%
Year Eight 0.10%
Year Nine 0.40%
Year Ten 0.40%
Reinsurance | Marine and aviation  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 3.00%
Year Two 28.80%
Year Three 20.00%
Year Four 13.00%
Year Five 10.60%
Year Six 3.40%
Year Seven 2.20%
Year Eight 1.00%
Year Nine 3.80%
Year Ten 0.40%
Reinsurance | Other specialty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 28.60%
Year Two 29.90%
Year Three 13.90%
Year Four 5.70%
Year Five 4.50%
Year Six 3.90%
Year Seven 1.70%
Year Eight 0.90%
Year Nine 0.60%
Year Ten 1.00%
Mortgage  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 5.10%
Year Two 29.10%
Year Three 24.20%
Year Four 10.70%
Year Five 4.70%
Year Six 1.80%
Year Seven 0.70%
Year Eight 0.50%
Year Nine 0.20%
Year Ten 0.10%