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Commitments and Contingencies (Nuclear Operations) (Narrative) (Details) (USD $)
1 Months Ended 12 Months Ended
Nov. 30, 2013
Dec. 31, 2014
Dec. 31, 2013
Loss Contingencies [Line Items]      
Amount of coverage purchased from commercial insurance pools   $ 375,000,000us-gaap_PrepaidInsurance  
Amount that could be assessed for each licensed reactor   127,000,000us-gaap_EstimatedInsuranceRecoveries  
Amount that could be assessed for each licensed reactor per reactor   19,000,000d_EstimatedInsuranceRecoveriesPerYearPerReactor  
Coverage that exceeds NRC minimum requirement   1,060,000,000.00d_LossContingencyUndiscountedAmountOfInsuranceRelatedAssessmentLiabilityAmountExceeded  
Maximum assessment for premiums on insurance policy   72,000,000d_MaximumRetrospectivePremiumAssessmentForNuclearPowerPlantLicensees  
Maximum assessment for insurance policy   20,000,000d_MaximumRetrospectivePremiumAssessmentForReplacementPowerCosts  
Current fee per kWh for electricity paid by civilian nuclear power generators 1d_PublicUtilitiesCurrentFeeperkWhforElectricityPaidbyCivilianNuclearPowerGeneratorsforDisposalofSpentNuclearFuel    
Waste fee recognized   16,000,000d_PublicUtilitiesWasteFeeforDisposalofSpentNuclearFuel  
Spent Nuclear Fuel      
Loss Contingencies [Line Items]      
Receivables   69,000,000d_ReceivablesForSpentNuclearFuelRelatedCosts
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= d_SpentNuclearFuelMember
79,000,000d_ReceivablesForSpentNuclearFuelRelatedCosts
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= d_SpentNuclearFuelMember
Millstone Unit 1      
Loss Contingencies [Line Items]      
Minimum financial assurance     2,900,000,000us-gaap_SecurityDeposit
/ us-gaap_EnvironmentalExitCostByPropertyAxis
= d_MillstoneUnit1Member
Millstone      
Loss Contingencies [Line Items]      
Settlement amount   17,000,000us-gaap_LitigationSettlementAmount
/ us-gaap_EnvironmentalExitCostByPropertyAxis
= d_MillstonePowerStationMember
 
Surry and North Anna      
Loss Contingencies [Line Items]      
Settlement amount   27,000,000us-gaap_LitigationSettlementAmount
/ us-gaap_EnvironmentalExitCostByPropertyAxis
= d_SurryAndNorthAnnaMember
 
Kewaunee      
Loss Contingencies [Line Items]      
Settlement amount   7,000,000us-gaap_LitigationSettlementAmount
/ us-gaap_EnvironmentalExitCostByPropertyAxis
= d_KewauneePowerStationMember
5,000,000us-gaap_LitigationSettlementAmount
/ us-gaap_EnvironmentalExitCostByPropertyAxis
= d_KewauneePowerStationMember
Nuclear Plant      
Loss Contingencies [Line Items]      
Liability protection under Price-Anderson Act   13,600,000,000us-gaap_LossContingencyUndiscountedAmountOfInsuranceRelatedAssessmentLiability
/ us-gaap_PublicUtilityAxis
= us-gaap_NuclearPlantMember
 
Virginia Electric and Power Company      
Loss Contingencies [Line Items]      
Maximum assessment for premiums on insurance policy   42,000,000d_MaximumRetrospectivePremiumAssessmentForNuclearPowerPlantLicensees
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
 
Maximum assessment for insurance policy   9,000,000d_MaximumRetrospectivePremiumAssessmentForReplacementPowerCosts
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
 
Waste fee recognized   10,000,000d_PublicUtilitiesWasteFeeforDisposalofSpentNuclearFuel
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
 
Virginia Electric and Power Company | Spent Nuclear Fuel      
Loss Contingencies [Line Items]      
Receivables   41,000,000d_ReceivablesForSpentNuclearFuelRelatedCosts
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= d_SpentNuclearFuelMember
50,000,000d_ReceivablesForSpentNuclearFuelRelatedCosts
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= d_SpentNuclearFuelMember
Virginia Electric and Power Company | Kewaunee      
Loss Contingencies [Line Items]      
Minimum financial assurance     $ 1,800,000,000us-gaap_SecurityDeposit
/ us-gaap_EnvironmentalExitCostByPropertyAxis
= d_KewauneePowerStationMember
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember