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Short Duration Contracts - Percentage annual payout - all segments (Details)
Dec. 31, 2022
Insurance | Property, energy, marine and aviation  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 20.30%
Year Two 44.20%
Year Three 18.40%
Year Four 5.20%
Year Five 1.50%
Year Six 1.10%
Year Seven 2.00%
Year Eight 2.20%
Year Nine 0.30%
Year Ten 0.00%
Insurance | Third party occurrence business  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 3.40%
Year Two 9.30%
Year Three 11.80%
Year Four 11.20%
Year Five 9.70%
Year Six 9.70%
Year Seven 5.40%
Year Eight 4.50%
Year Nine 3.80%
Year Ten 2.90%
Insurance | Third party claims-made business  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 4.10%
Year Two 17.20%
Year Three 17.20%
Year Four 11.40%
Year Five 13.60%
Year Six 8.80%
Year Seven 6.40%
Year Eight 2.00%
Year Nine 2.10%
Year Ten 2.40%
Insurance | Multi-line and other specialty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 34.30%
Year Two 28.90%
Year Three 10.90%
Year Four 8.80%
Year Five 4.50%
Year Six 3.10%
Year Seven 0.90%
Year Eight 0.40%
Year Nine 0.40%
Year Ten 0.00%
Reinsurance | Casualty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 2.80%
Year Two 7.80%
Year Three 12.40%
Year Four 11.30%
Year Five 9.50%
Year Six 8.20%
Year Seven 7.50%
Year Eight 5.00%
Year Nine 3.80%
Year Ten 4.70%
Reinsurance | Property catastrophe  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 41.70%
Year Two 27.30%
Year Three 49.40%
Year Four (115.60%)
Year Five (10.70%)
Year Six 4.10%
Year Seven 1.70%
Year Eight 1.70%
Year Nine (0.50%)
Year Ten 0.10%
Reinsurance | Property excluding property catastrophe  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 27.00%
Year Two 37.40%
Year Three 13.20%
Year Four 5.60%
Year Five 4.00%
Year Six 0.60%
Year Seven 2.40%
Year Eight 0.40%
Year Nine 0.10%
Year Ten 2.50%
Reinsurance | Marine and aviation  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 4.50%
Year Two 28.80%
Year Three 18.30%
Year Four 10.90%
Year Five 8.40%
Year Six 3.00%
Year Seven 2.40%
Year Eight 0.10%
Year Nine 3.60%
Year Ten 2.90%
Reinsurance | Other specialty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 29.90%
Year Two 29.90%
Year Three 13.10%
Year Four 6.00%
Year Five 4.40%
Year Six 3.30%
Year Seven 1.80%
Year Eight 0.60%
Year Nine 0.80%
Year Ten 1.30%
Mortgage  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 5.60%
Year Two 30.90%
Year Three 23.80%
Year Four 9.80%
Year Five 4.00%
Year Six 1.80%
Year Seven 0.70%
Year Eight 0.30%
Year Nine 0.10%
Year Ten 0.00%