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Short-Duration Insurance Contracts Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (Details)
Dec. 31, 2016
Personal Insurance Segments [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 62.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 21.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 9.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 4.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 2.10%
Business insurance segment  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 48.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 22.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 10.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 6.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 3.00%
Specialty Insurance Segment [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 25.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 23.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 18.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 17.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 11.90%
Long-tail [Domain] | Business insurance segment  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 17.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 23.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 16.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 10.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 8.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 4.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 2.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 2.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 2.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.70%
Long-tail [Domain] | Specialty Insurance Segment [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 5.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 14.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 18.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 10.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 9.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 8.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 2.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 6.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 2.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 2.20%