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Investments (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
1 Months Ended 3 Months Ended
Jan. 31, 2014
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Blue Racer          
Gain (Loss) on Investments [Line Items]          
Increase in equity method investment $ 155d_EquityMethodInvestmentIncreasefromContribution
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
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Write off of goodwill 6us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= d_BlueRacerMidstreamLlcMember
       
Blue Racer | Pipelines          
Gain (Loss) on Investments [Line Items]          
Consideration for Northern System   84us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds
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/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
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  84us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds
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/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
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Cash proceeds from sale of assets   84us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
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/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
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After tax gain on sale of assets   34d_GainLossonDispositionofPropertyPlantAndEquipmentNetofTax
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/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
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Dominion Gas Holdings, LLC          
Gain (Loss) on Investments [Line Items]          
Equity in earnings on investments     8us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
8us-gaap_IncomeLossFromEquityMethodInvestments
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Distributions received from investment     12us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
5us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
 
Carrying amount of investment that exceeded share of underlying equity         8us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
Dominion Gas Holdings, LLC | Blue Racer | Pipelines          
Gain (Loss) on Investments [Line Items]          
Write off of goodwill   3us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
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Cash proceeds from sale of assets   17us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
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= d_DominionGasHoldingsLLCMember
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Extinguishment of affiliated current borrowings   67us-gaap_ExtinguishmentOfDebtAmount
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= d_DominionGasHoldingsLLCMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_PipelinesMember
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= d_BlueRacerMidstreamLlcMember
     
Gain on sale of assets   59us-gaap_GainLossOnSaleOfPropertyPlantEquipment
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= d_DominionGasHoldingsLLCMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_PipelinesMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= d_BlueRacerMidstreamLlcMember
     
After tax gain on sale of assets   35d_GainLossonDispositionofPropertyPlantAndEquipmentNetofTax
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_PipelinesMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
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Categories of Investments, Marketable Securities, Trading Securities          
Gain (Loss) on Investments [Line Items]          
Assets Held-in-trust     116us-gaap_AssetsHeldInTrust
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  110us-gaap_AssetsHeldInTrust
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Cost method investments          
Gain (Loss) on Investments [Line Items]          
Assets Held-in-trust     $ 6us-gaap_AssetsHeldInTrust
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  $ 6us-gaap_AssetsHeldInTrust
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