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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Income taxes    
Net deferred income tax liability, consolidated $ 454erie_NetDeferredTaxAssetsOrNetDeferredTaxLiabilitiesConsolidatingPresentation  
Net deferred income tax asset 40us-gaap_DeferredTaxAssetsLiabilitiesNet 37us-gaap_DeferredTaxAssetsLiabilitiesNet
Net deferred income tax liability 494us-gaap_DeferredTaxLiabilities 490us-gaap_DeferredTaxLiabilities
Deferred tax asset valuation allowance 0us-gaap_DeferredTaxAssetsValuationAllowance  
Indemnity    
Income taxes    
Net deferred income tax asset 40us-gaap_DeferredTaxAssetsLiabilitiesNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
37us-gaap_DeferredTaxAssetsLiabilitiesNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net deferred income tax liability 0us-gaap_DeferredTaxLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_DeferredTaxLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Effective tax rate when investment related permanent tax differences are excluded (as a percent) 35.00%erie_EffectiveIncomeTaxRateExcludingInvestmentRevenuePermanentTaxDifferences
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Exchange    
Income taxes    
Net deferred income tax asset 0us-gaap_DeferredTaxAssetsLiabilitiesNet
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
0us-gaap_DeferredTaxAssetsLiabilitiesNet
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Net deferred income tax liability $ 494us-gaap_DeferredTaxLiabilities
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
$ 490us-gaap_DeferredTaxLiabilities
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Effective tax rate when investment related permanent tax differences are excluded (as a percent) 35.00%erie_EffectiveIncomeTaxRateExcludingInvestmentRevenuePermanentTaxDifferences
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
 
Minimum | Indemnity    
Income taxes    
Percent of total permanent tax differences related to investment revenues (as a percent) 98.00%erie_IncomeTaxReconciliationPermanentTaxDifferencesPercentageFromInvestmentRevenues
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Minimum | Exchange    
Income taxes    
Percent of total permanent tax differences related to investment revenues (as a percent) 98.00%erie_IncomeTaxReconciliationPermanentTaxDifferencesPercentageFromInvestmentRevenues
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember