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Unpaid losses and loss expenses Unpaid losses and loss expenses (Average Annual Payout) (Details)
Dec. 31, 2022
North America Commercial P&C Insurance - Workers' Compensation [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 10.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 16.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 10.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 7.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 5.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 3.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 3.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 2.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 2.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 1.00%
North America Commercial P&C Insurance - Liability [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 4.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 13.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 16.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 16.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 12.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 8.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 5.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 4.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 2.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 3.00%
North America Commercial P&C Insurance - Other Casualty [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 11.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 19.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 19.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 16.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 13.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 6.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 4.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 2.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 2.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 1.00%
North America Commercial P&C Insurance - Non-Casualty [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 45.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 36.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 8.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 3.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 1.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 1.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 1.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 0.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 0.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 1.00%
North America Personal P&C Insurance [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 56.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 24.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 7.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 5.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 3.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 2.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 1.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 1.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 0.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.00%
Overseas General Insurance - Casualty [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 7.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 14.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 13.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 12.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 10.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 8.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 7.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 4.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 2.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 2.00%
Overseas General Insurance - Non-Casualty [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 45.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 34.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 10.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 3.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 1.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 1.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 1.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 0.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 0.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.00%
Global Reinsurance - Casualty [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 20.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 23.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 11.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 9.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 6.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 6.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 4.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 2.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 2.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 1.00%
Global Reinsurance - Non-Casualty [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 34.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 40.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 15.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 5.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 3.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 2.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 1.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 0.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 0.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.00%