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Incentive and Deferred Compensation Plans (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Total incentive and deferred compensation plans      
Awards, employer match, and hypothetical earnings by plan:      
Total plan awards and earnings $ 22erie_IncentivePlansAndDeferredCompensationTotalAwardsAndEarnings
/ us-gaap_PlanNameAxis
= erie_TotalCashBasedIncentiveAndShareBasedPaymentAndDeferredCompensationPlansMember
$ 18erie_IncentivePlansAndDeferredCompensationTotalAwardsAndEarnings
/ us-gaap_PlanNameAxis
= erie_TotalCashBasedIncentiveAndShareBasedPaymentAndDeferredCompensationPlansMember
$ 11erie_IncentivePlansAndDeferredCompensationTotalAwardsAndEarnings
/ us-gaap_PlanNameAxis
= erie_TotalCashBasedIncentiveAndShareBasedPaymentAndDeferredCompensationPlansMember
Total plan awards paid (15)erie_IncentivePlanCompensationTotalLiabilitiesPaid
/ us-gaap_PlanNameAxis
= erie_TotalCashBasedIncentiveAndShareBasedPaymentAndDeferredCompensationPlansMember
(10)erie_IncentivePlanCompensationTotalLiabilitiesPaid
/ us-gaap_PlanNameAxis
= erie_TotalCashBasedIncentiveAndShareBasedPaymentAndDeferredCompensationPlansMember
(8)erie_IncentivePlanCompensationTotalLiabilitiesPaid
/ us-gaap_PlanNameAxis
= erie_TotalCashBasedIncentiveAndShareBasedPaymentAndDeferredCompensationPlansMember
Gross incentive plan and deferred compensation liabilities at end of period 39erie_AccruedBonusesAndDeferredCompensationLiabilityCurrentAndNoncurrent
/ us-gaap_PlanNameAxis
= erie_TotalCashBasedIncentiveAndShareBasedPaymentAndDeferredCompensationPlansMember
33erie_AccruedBonusesAndDeferredCompensationLiabilityCurrentAndNoncurrent
/ us-gaap_PlanNameAxis
= erie_TotalCashBasedIncentiveAndShareBasedPaymentAndDeferredCompensationPlansMember
26erie_AccruedBonusesAndDeferredCompensationLiabilityCurrentAndNoncurrent
/ us-gaap_PlanNameAxis
= erie_TotalCashBasedIncentiveAndShareBasedPaymentAndDeferredCompensationPlansMember
Annual incentive plan      
Awards, employer match, and hypothetical earnings by plan:      
Annual incentive plan awards 6us-gaap_OtherLaborRelatedExpenses
/ us-gaap_PlanNameAxis
= erie_AnnualIncentivePlanMember
8us-gaap_OtherLaborRelatedExpenses
/ us-gaap_PlanNameAxis
= erie_AnnualIncentivePlanMember
5us-gaap_OtherLaborRelatedExpenses
/ us-gaap_PlanNameAxis
= erie_AnnualIncentivePlanMember
Long-term incentive plan      
Awards, employer match, and hypothetical earnings by plan:      
Long-term incentive plan awards 13.0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= erie_LongTermIncentivePlanMember
8.0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= erie_LongTermIncentivePlanMember
5.0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= erie_LongTermIncentivePlanMember
Deferred compensation plans and stock compensation plan for outside directors      
Awards, employer match, and hypothetical earnings by plan:      
Deferred compensation plans, employer match, and hypothetical earnings 3us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
/ us-gaap_PlanNameAxis
= erie_DeferredCompensationPlanAndStockCompensationPlanOutsideDirectorsMember
2us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
/ us-gaap_PlanNameAxis
= erie_DeferredCompensationPlanAndStockCompensationPlanOutsideDirectorsMember
1us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
/ us-gaap_PlanNameAxis
= erie_DeferredCompensationPlanAndStockCompensationPlanOutsideDirectorsMember
Compensation deferred under the plans 0erie_DeferredCompensationArrangementWithIndividualLiabilityIncurredDuringPeriod
/ us-gaap_PlanNameAxis
= erie_DeferredCompensationPlanAndStockCompensationPlanOutsideDirectorsMember
0erie_DeferredCompensationArrangementWithIndividualLiabilityIncurredDuringPeriod
/ us-gaap_PlanNameAxis
= erie_DeferredCompensationPlanAndStockCompensationPlanOutsideDirectorsMember
0erie_DeferredCompensationArrangementWithIndividualLiabilityIncurredDuringPeriod
/ us-gaap_PlanNameAxis
= erie_DeferredCompensationPlanAndStockCompensationPlanOutsideDirectorsMember
Distributions from the deferred compensation plans $ (1)us-gaap_DeferredCompensationArrangementWithIndividualDistributionsPaid
/ us-gaap_PlanNameAxis
= erie_DeferredCompensationPlanAndStockCompensationPlanOutsideDirectorsMember
$ (1)us-gaap_DeferredCompensationArrangementWithIndividualDistributionsPaid
/ us-gaap_PlanNameAxis
= erie_DeferredCompensationPlanAndStockCompensationPlanOutsideDirectorsMember
$ (1)us-gaap_DeferredCompensationArrangementWithIndividualDistributionsPaid
/ us-gaap_PlanNameAxis
= erie_DeferredCompensationPlanAndStockCompensationPlanOutsideDirectorsMember