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Policy and Claim Reserves (Average Annual Percentage Payout of Incurred Claims by Age) (Details)
Dec. 31, 2016
Homeowners, Dwelling Fire and Other Liability [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1 87.60%
2 9.70%
3 1.10%
4 0.60%
5 0.60%
6 0.30%
7 0.10%
8 (0.10%)
9 (0.10%)
10 0.20%
Accident and Health Claim [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1 67.60%
2 25.30%
3 7.20%