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Commitments and Contingencies (Nuclear Insurance) (Details) (USD $)
Dec. 31, 2014
Millstone  
Guarantor Obligations [Line Items]  
Property insurance coverage $ 1,700,000d_PropertyAndCasualtyInsuranceCoverageAmount
/ us-gaap_GuaranteeObligationsByNatureAxis
= d_MillstonePowerStationMember
Kewaunee  
Guarantor Obligations [Line Items]  
Property insurance coverage 1,060,000d_PropertyAndCasualtyInsuranceCoverageAmount
/ us-gaap_GuaranteeObligationsByNatureAxis
= d_KewauneePowerStationMember
Surry | Virginia Electric and Power Company  
Guarantor Obligations [Line Items]  
Property insurance coverage 1,700,000d_PropertyAndCasualtyInsuranceCoverageAmount
/ us-gaap_GuaranteeObligationsByNatureAxis
= d_SurryPowerStationMember
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 [1]
North Anna | Virginia Electric and Power Company  
Guarantor Obligations [Line Items]  
Property insurance coverage 1,700,000d_PropertyAndCasualtyInsuranceCoverageAmount
/ us-gaap_GuaranteeObligationsByNatureAxis
= d_NorthAnnaPowerStationMember
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 [1]
Surry and North Anna  
Guarantor Obligations [Line Items]  
Coverage amount $ 200,000,000d_PropertyAndCasualtyInsuranceBlanketPropertyLimit
/ us-gaap_GuaranteeObligationsByNatureAxis
= d_SurryAndNorthAnnaMember
[1] Surry and North Anna share a blanket property limit of $200 million.