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Property Casualty Loss And Loss Expenses (Average Annual Payout) (Details)
Dec. 31, 2017
Commercial Insurance | Commercial Auto Line  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1 43.30%
2 18.70%
3 14.50%
4 11.20%
5 6.70%
Commercial Insurance | Workers' Compensation Line  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1 25.90%
2 26.90%
3 12.40%
4 7.00%
5 4.20%
6 2.40%
7 1.50%
8 1.40%
9 0.80%
10 0.50%
Commercial Insurance | Commercial Casualty Line  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1 7.90%
2 14.90%
3 18.00%
4 17.70%
5 13.70%
6 8.80%
7 4.80%
8 3.50%
9 1.60%
10 1.80%
Commercial Insurance | Commercial Property Line  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1 66.00%
2 26.90%
3 4.40%
4 1.10%
5 0.90%
Personal Insurance | Home Owner Line  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1 74.40%
2 21.30%
3 3.00%
4 0.70%
5 0.40%
Personal Insurance | Personal Auto  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1 63.70%
2 18.10%
3 9.40%
4 4.80%
5 1.90%
Excess and Surplus Lines Insurance  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1 16.00%
2 14.10%
3 17.50%
4 14.70%
5 10.70%
6 7.20%
7 1.10%