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Regulatory Assets and Liabilities (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Public Utilities, General Disclosures [Line Items]  
Regulatory assets past expenditures not earning return $ 129us-gaap_RemainingAmountsOfRegulatoryAssetsForWhichNoReturnOnInvestmentDuringRecoveryPeriodIsProvided
Period for which expenditures are expected to be recovered 2 years
Virginia Electric and Power Company  
Public Utilities, General Disclosures [Line Items]  
Regulatory assets past expenditures not earning return 97us-gaap_RemainingAmountsOfRegulatoryAssetsForWhichNoReturnOnInvestmentDuringRecoveryPeriodIsProvided
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Dominion Gas Holdings, LLC  
Public Utilities, General Disclosures [Line Items]  
Regulatory assets past expenditures not earning return $ 30us-gaap_RemainingAmountsOfRegulatoryAssetsForWhichNoReturnOnInvestmentDuringRecoveryPeriodIsProvided
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember