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Reinsurance (Details 2) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Property and Casualty Group
     
Reinsurance      
Ceded premiums written $ 57,000,000 $ 49,000,000 $ 37,000,000
Life insurance operations | Erie Family Life Insurance Company (EFL)
     
Reinsurance      
Direct life insurance in force 45,000,000,000 44,000,000,000  
Ceded life insurance in force 21,000,000,000 22,000,000,000  
Largest amount of in force life insurance ceded to a single reinsurer 10,000,000,000 11,000,000,000  
Equipment breakdown, employment practices liability, and identity recovery lines of business | Property and Casualty Group | Hartford Steam Boiler Inspection and Insurance Company, an unaffiliated reinsurer | A.M. Best, A Plus Plus rated
     
Reinsurance      
Percentage of ceded covered insurance risk relating to reinsured portions of certain lines of business through quota share reinsurance agreements (as a percent) 100.00%    
Ceded premiums written $ 21,000,000 $ 17,000,000 $ 14,000,000