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Reserve For Losses And Loss Expenses (Historical Claims Duration) (Details)
Dec. 31, 2016
North American Insurance | General casualty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 3.00%
Year Two 13.00%
Year Three 18.00%
Year Four 13.00%
Year Five 14.00%
Year Six 6.00%
Year Seven 7.00%
North American Insurance | Professional liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 5.00%
Year Two 20.00%
Year Three 18.00%
Year Four 16.00%
Year Five 12.00%
Year Six 8.00%
Year Seven 14.00%
North American Insurance | General property  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 34.00%
Year Two 44.00%
Year Three 17.00%
Year Four 7.00%
Year Five 2.00%
Year Six 1.00%
Year Seven 0.00%
North American Insurance | Programs  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 9.00%
Year Two 20.00%
Year Three 21.00%
Year Four 15.00%
Year Five 11.00%
Year Six 6.00%
Year Seven 4.00%
North American Insurance | Healthcare  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 1.00%
Year Two 9.00%
Year Three 23.00%
Year Four 21.00%
Year Five 17.00%
Year Six 14.00%
Year Seven 5.00%
North American Insurance | Specialty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 8.00%
Year Two 23.00%
Year Three 13.00%
Year Four 9.00%
Year Five 3.00%
Year Six 3.00%
Year Seven 66.00%
Global Markets Insurance | General casualty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 2.00%
Year Two 5.00%
Year Three 2.00%
Year Four 16.00%
Year Five 3.00%
Year Six 0.00%
Year Seven 0.00%
Global Markets Insurance | Professional liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 1.00%
Year Two 4.00%
Year Three 13.00%
Year Four 6.00%
Year Five 12.00%
Year Six 2.00%
Year Seven 38.00%
Global Markets Insurance | General property  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 25.00%
Year Two 34.00%
Year Three 18.00%
Year Four 11.00%
Year Five 5.00%
Year Six 1.00%
Year Seven 0.00%
Global Markets Insurance | Specialty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 18.00%
Year Two 23.00%
Year Three 37.00%
Year Four 7.00%
Year Five 0.00%
Year Six 0.00%
Year Seven 0.00%
Reinsurance | Property  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 28.00%
Year Two 37.00%
Year Three 18.00%
Year Four 7.00%
Year Five 5.00%
Year Six 2.00%
Year Seven 1.00%
Reinsurance | Casualty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 3.00%
Year Two 10.00%
Year Three 12.00%
Year Four 12.00%
Year Five 13.00%
Year Six 7.00%
Year Seven 6.00%
Reinsurance | Specialty and other  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 13.00%
Year Two 57.00%
Year Three 14.00%
Year Four 4.00%
Year Five 4.00%
Year Six 2.00%
Year Seven 3.00%