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Incentive and Deferred Compensation Plans (Details) (USD $)
12 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2014
May 31, 2013
Long-term incentive plan          
Incentive and deferred compensation plans          
Vesting period of performance and/or service condition(s) (in years and/or months) 3 years        
Maximum dollar amount which may be received by any single participant during any specified period $ 5,000,000erie_IncentivePlanMaximumCompensationExpensePerEmployeePerSpecifiedPeriod
/ us-gaap_PlanNameAxis
= erie_LongTermIncentivePlanMember
       
Compensation cost related to share-based compensation plan awards 13,000,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= erie_LongTermIncentivePlanMember
8,000,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= erie_LongTermIncentivePlanMember
5,000,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= erie_LongTermIncentivePlanMember
   
Tax benefits recognized in income related to award expense 4,000,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_PlanNameAxis
= erie_LongTermIncentivePlanMember
3,000,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_PlanNameAxis
= erie_LongTermIncentivePlanMember
2,000,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_PlanNameAxis
= erie_LongTermIncentivePlanMember
   
Total unrecognized compensation cost related to share-based compensation plan awards pertaining to open performance periods 11,000,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_PlanNameAxis
= erie_LongTermIncentivePlanMember
       
Expected period of recognition related to unrecognized compensation cost (in years) 2 years        
Long-term incentive plan | Class A          
Incentive and deferred compensation plans          
Maximum number of shares authorized for grant (in shares) 1,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= erie_LongTermIncentivePlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
       
Maximum number of shares which may be received by any single participant during any specified period (in shares) 250,000erie_ShareBasedCompensationArrangementbyShareBasedPaymentAwardMaximumNumberofSharesPerEmployeePerSpecifiedPeriod
/ us-gaap_PlanNameAxis
= erie_LongTermIncentivePlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
       
Long-term incentive plan | 2012-2014 performance period          
Incentive and deferred compensation plans          
Compensation cost related to share-based compensation plan awards 9,000,000us-gaap_AllocatedShareBasedCompensationExpense
/ erie_IncentivePlanByPerformancePeriodAxis
= erie_PerformancePeriodLongTermIncentivePlan2012To2014Member
/ us-gaap_PlanNameAxis
= erie_LongTermIncentivePlanMember
       
Long-term incentive plan | 2011-2013 performance period | Class A          
Incentive and deferred compensation plans          
Compensation cost related to share-based compensation plan awards       4,000,000us-gaap_AllocatedShareBasedCompensationExpense
/ erie_IncentivePlanByPerformancePeriodAxis
= erie_PerformancePeriodLongTermIncentivePlan2011To2013Member
/ us-gaap_PlanNameAxis
= erie_LongTermIncentivePlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Average price per share (in dollars per share)       $ 75.36us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased
/ erie_IncentivePlanByPerformancePeriodAxis
= erie_PerformancePeriodLongTermIncentivePlan2011To2013Member
/ us-gaap_PlanNameAxis
= erie_LongTermIncentivePlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Shares repurchased outside of publicly announced stock repurchase program for share-based compensation awards (in shares)       54,371us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward
/ erie_IncentivePlanByPerformancePeriodAxis
= erie_PerformancePeriodLongTermIncentivePlan2011To2013Member
/ us-gaap_PlanNameAxis
= erie_LongTermIncentivePlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Long-term incentive plan | 2010-2012 performance period          
Incentive and deferred compensation plans          
Compensation cost related to share-based compensation plan awards         5,000,000us-gaap_AllocatedShareBasedCompensationExpense
/ erie_IncentivePlanByPerformancePeriodAxis
= erie_PerformancePeriodLongTermIncentivePlan2010To2012Member
/ us-gaap_PlanNameAxis
= erie_LongTermIncentivePlanMember
Equity compensation plan | Class A          
Incentive and deferred compensation plans          
Maximum number of shares authorized for grant (in shares) 100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= erie_EquityCompensationPlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
       
Maximum number of shares which may be received by any single participant during any specified period (in shares) 5,000erie_ShareBasedCompensationArrangementbyShareBasedPaymentAwardMaximumNumberofSharesPerEmployeePerSpecifiedPeriod
/ us-gaap_PlanNameAxis
= erie_EquityCompensationPlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
       
Restricted stock units granted 8,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_PlanNameAxis
= erie_EquityCompensationPlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_PlanNameAxis
= erie_EquityCompensationPlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
     
Compensation cost related to share-based compensation plan awards 300,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= erie_EquityCompensationPlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
       
Total unrecognized compensation cost related to share-based compensation plan awards pertaining to open performance periods 1,000,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_PlanNameAxis
= erie_EquityCompensationPlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
       
Expected period of recognition related to unrecognized compensation cost (in years) 4 years        
Stock compensation plan for outside directors | Class A          
Incentive and deferred compensation plans          
Compensation cost related to share-based compensation plan awards $ 2,000,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= erie_StockCompensationPlanOutsideDirectorsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 1,000,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= erie_StockCompensationPlanOutsideDirectorsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 500,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= erie_StockCompensationPlanOutsideDirectorsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
   
Stock compensation plan for outside directors | Three month vesting period | Class A          
Incentive and deferred compensation plans          
Vesting period of performance and/or service condition(s) (in years and/or months) 3 months        
Vesting percent of the grant in Class A common stock (as a percent) 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_PlanNameAxis
= erie_StockCompensationPlanOutsideDirectorsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_VestingAxis
= erie_ThreeMonthVestingPeriodMember