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Property Casualty Loss And Loss Expenses (Average Annual Payout) (Details)
Dec. 31, 2018
Commercial Insurance | Commercial Auto Line  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1 42.30%
2 18.30%
3 15.20%
4 10.80%
5 7.50%
Commercial Insurance | Workers' Compensation Line  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1 26.20%
2 26.60%
3 12.20%
4 6.90%
5 4.10%
6 2.10%
7 1.40%
8 1.20%
9 0.90%
10 0.90%
Commercial Insurance | Commercial Casualty Line  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1 7.80%
2 14.50%
3 18.20%
4 18.00%
5 13.20%
6 8.40%
7 4.30%
8 3.50%
9 1.40%
10 2.70%
Commercial Insurance | Commercial Property Line  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1 66.40%
2 25.50%
3 4.60%
4 1.00%
5 0.70%
Personal Insurance | Home Owner Line  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1 73.20%
2 20.90%
3 3.40%
4 0.80%
5 0.20%
Personal Insurance | Personal Auto  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1 63.60%
2 17.70%
3 9.30%
4 5.20%
5 2.10%
Excess and Surplus Lines Insurance  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1 15.80%
2 14.40%
3 18.80%
4 15.60%
5 10.50%
6 6.80%
7 2.00%
8 0.50%