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Quarterly Financial and Common Stock Data (Unaudited) (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Jun. 30, 2014
Mar. 31, 2014
Jun. 30, 2013
Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]          
After tax charges associated with liability management exercise $ 172d_RedemptionPremiumAfterTax        
Charge recognized, net of tax   191d_LossContingencyLossinPeriodNetofTax 193d_LossContingencyLossinPeriodNetofTax    
Impairment charge after tax       33d_ImpairmentOfLongLivedAssetsHeldForUseNetOfTax  
Loss from producer services business after tax       24d_RestructuringChargesNetOfTax  
Brayton Point and Kincaid          
Condensed Financial Statements, Captions [Line Items]          
Loss before income taxes       (70)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
/ dei_LegalEntityAxis
= d_BraytonPointAndKincaidMember
 
Loss from operations after tax       57us-gaap_IncomeLossIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= d_BraytonPointAndKincaidMember
 
Virginia Electric and Power Company          
Condensed Financial Statements, Captions [Line Items]          
Charge related to settlement offer, net of tax 74d_EnvironmentalRemediationExpenseNetofTax
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
       
Charge recognized, net of tax   191d_LossContingencyLossinPeriodNetofTax
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
     
Restoration costs net of tax 28d_CostOfPropertyRepairsAndMaintenanceNetOfTax
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
       
Dominion Gas Holdings, LLC          
Condensed Financial Statements, Captions [Line Items]          
Impairment charge after tax         33d_ImpairmentOfLongLivedAssetsHeldForUseNetOfTax
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
After tax gain from agreement to convey development rights 36us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
       
Impairment charge, net of tax   $ 33d_OtherAssetImpairmentChargesNetOfTax
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember