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Indemnity Earnings Per Share (Details) (Indemnity, USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Class A      
Income available to stockholders (Basic EPS:)      
Allocated net income (numerator) (in dollars) $ 39us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 46us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Weighted shares (denominator) (in shares) 46,189,068us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
46,402,270us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Per-share amount (in dollars per share) $ 0.83us-gaap_EarningsPerShareBasic
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 0.99us-gaap_EarningsPerShareBasic
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Dilutive effect of stock-based awards      
Allocated net income (numerator) (in dollars) 0us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
0us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Weighted shares (denominator) (in shares) 344,884us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
95,141us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Assumed conversion of Class B shares      
Allocated net income (numerator) (in dollars) 0us-gaap_DilutiveSecuritiesEffectOnBasicEarningsPerShareOther
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
0us-gaap_DilutiveSecuritiesEffectOnBasicEarningsPerShareOther
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Weighted shares (denominator) (in shares) 6,100,800erie_IncrementalCommonSharesAttributableToConversionOfConvertibleCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
6,100,800erie_IncrementalCommonSharesAttributableToConversionOfConvertibleCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Income available to stockholders on equivalent shares (Diluted EPS:)      
Allocated net income (numerator) (in dollars) 39us-gaap_NetIncomeLossAttributableToParentDiluted
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
46us-gaap_NetIncomeLossAttributableToParentDiluted
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Weighted shares (denominator) (in shares) 52,634,752us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
52,598,211us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Per-share amount (in dollars per share) $ 0.74us-gaap_EarningsPerShareDiluted
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 0.88us-gaap_EarningsPerShareDiluted
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Class B      
Reconciliation of the numerators and denominators used in the basic and diluted per-share computations      
Ratio for converting shares of Class B common stock into shares of Class A common stock (as a percent) 2400.00%erie_CommonStockConversionRatio
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
  2400.00%erie_CommonStockConversionRatio
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Income available to stockholders (Basic EPS:)      
Allocated net income (numerator) (in dollars) 0us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
0us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
 
Weighted shares (denominator) (in shares) 2,542us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
2,542us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
 
Per-share amount (in dollars per share) $ 125.00us-gaap_EarningsPerShareBasic
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
$ 149.00us-gaap_EarningsPerShareBasic
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
 
Income available to stockholders on equivalent shares (Diluted EPS:)      
Allocated net income (numerator) (in dollars) $ 0us-gaap_NetIncomeLossAttributableToParentDiluted
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
$ 0us-gaap_NetIncomeLossAttributableToParentDiluted
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
 
Weighted shares (denominator) (in shares) 2,542us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
2,542us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
 
Per-share amount (in dollars per share) $ 125.00us-gaap_EarningsPerShareDiluted
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
$ 149.00us-gaap_EarningsPerShareDiluted
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember