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Short Duration Contracts - Percentage annual payout - all segments (Details)
Dec. 31, 2021
Insurance | Property, energy, marine and aviation  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 19.30%
Year Two 43.50%
Year Three 19.10%
Year Four 6.60%
Year Five 1.40%
Year Six 2.30%
Year Seven 3.20%
Year Eight 0.50%
Year Nine 0.30%
Year Ten 0.20%
Insurance | Third party occurrence business  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 3.30%
Year Two 9.30%
Year Three 11.60%
Year Four 11.00%
Year Five 9.80%
Year Six 8.70%
Year Seven 5.40%
Year Eight 4.10%
Year Nine 3.50%
Year Ten 2.10%
Insurance | Third party claims-made business  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 4.40%
Year Two 18.00%
Year Three 17.80%
Year Four 12.30%
Year Five 12.70%
Year Six 7.90%
Year Seven 7.00%
Year Eight 4.30%
Year Nine 1.00%
Year Ten 1.70%
Insurance | Multi-line and other specialty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 34.70%
Year Two 29.50%
Year Three 11.00%
Year Four 8.60%
Year Five 4.60%
Year Six 2.80%
Year Seven 0.70%
Year Eight 0.70%
Year Nine 0.80%
Year Ten (0.10%)
Reinsurance | Casualty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 2.50%
Year Two 7.30%
Year Three 11.60%
Year Four 11.30%
Year Five 9.60%
Year Six 8.40%
Year Seven 7.70%
Year Eight 5.90%
Year Nine 4.40%
Year Ten 3.00%
Reinsurance | Property catastrophe  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 21.60%
Year Two 30.00%
Year Three 32.80%
Year Four (14.20%)
Year Five (11.60%)
Year Six 2.20%
Year Seven 1.00%
Year Eight 1.20%
Year Nine (0.40%)
Year Ten 0.20%
Reinsurance | Property catastrophe and property other than property catastrophe  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 26.70%
Year Two 38.90%
Year Three 13.30%
Year Four 5.80%
Year Five 3.40%
Year Six 0.40%
Year Seven 2.00%
Year Eight 0.40%
Year Nine 0.00%
Year Ten 0.00%
Reinsurance | Marine and aviation  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 4.90%
Year Two 26.90%
Year Three 19.00%
Year Four 10.30%
Year Five 7.40%
Year Six 2.90%
Year Seven 2.40%
Year Eight 0.00%
Year Nine 0.10%
Year Ten 0.00%
Reinsurance | Other specialty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 26.30%
Year Two 34.20%
Year Three 12.90%
Year Four 5.20%
Year Five 4.20%
Year Six 3.10%
Year Seven 2.10%
Year Eight 0.90%
Year Nine 0.80%
Year Ten (0.10%)
Mortgage  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 2.70%
Year Two 34.90%
Year Three 25.30%
Year Four 10.50%
Year Five 4.40%
Year Six 2.10%
Year Seven 0.90%
Year Eight 0.50%
Year Nine 0.10%
Year Ten 0.10%