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Property Casualty Loss And Loss Expenses (Average Annual Payout) (Details)
Dec. 31, 2016
Commercial Insurance | Commercial Auto Line  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1 44.40%
2 18.40%
3 13.90%
4 12.20%
5 6.90%
Commercial Insurance | Workers' Compensation Line  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1 25.70%
2 26.90%
3 12.70%
4 7.10%
5 4.40%
6 2.40%
7 1.60%
8 1.40%
9 1.20%
10 0.50%
Commercial Insurance | Commercial Casualty Line  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1 8.00%
2 15.40%
3 17.70%
4 16.50%
5 13.80%
6 8.30%
7 4.70%
8 4.00%
9 1.50%
10 2.90%
Commercial Insurance | Commercial Auto Line  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1 65.00%
2 26.80%
3 4.60%
4 1.20%
5 0.90%
Personal Insurance | Home Owner Line  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1 73.80%
2 19.70%
3 2.60%
4 1.00%
5 0.30%
Personal Insurance | Personal Auto  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1 64.00%
2 17.90%
3 9.60%
4 4.80%
5 2.00%
Excess and Surplus Lines Insurance  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1 15.90%
2 13.50%
3 17.40%
4 13.50%
5 9.90%
6 7.40%