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Insurance Claim Reserves Footnote (details) - Historical Claim Duration
Dec. 31, 2016
Business and International Insurance [Member] | General liability [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 3.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 13.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 19.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 17.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 12.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 8.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 5.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 2.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 3.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 1.60%
Business and International Insurance [Member] | Commercial property [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 51.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 31.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 8.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 2.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 0.80%
Business and International Insurance [Member] | Commercial multi-peril [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 39.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 22.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 10.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 8.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 6.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 3.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 1.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 1.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 0.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.40%
Business and International Insurance [Member] | Automobile [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 34.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 20.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 16.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 12.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 7.60%
Business and International Insurance [Member] | Workers' compensation [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 17.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 19.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 11.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 7.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 5.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 4.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 3.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 2.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 2.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 1.90%
Business and International Insurance [Member] | International - Canada [Member] | Property casualty [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 38.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 20.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 8.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 7.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 7.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 5.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 3.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 2.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 1.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 1.40%
Bond & Specialty Insurance [Member] | General liability [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 6.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 19.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 18.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 15.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 12.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 7.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 6.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 3.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 1.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 1.10%
Bond & Specialty Insurance [Member] | Fidelity and surety [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 26.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 36.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 10.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four (3.60%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 0.80%
Personal Insurance [Member] | Automobile [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 60.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 19.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 9.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 5.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 2.70%
Personal Insurance [Member] | Homeowners (excluding Other) [Member]  
Historical Claims Duration  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 71.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 20.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 3.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 1.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 0.70%