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Commitments and Contingencies (Subsidiary Guarantees) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
guarantee
Guarantor Obligations [Line Items]  
Stated Limit $ 6,366,000,000us-gaap_GuaranteeObligationsMaximumExposure
Value 1,453,000,000us-gaap_GuaranteeObligationsCurrentCarryingValue [1]
Number of DEI subsidiaries 2d_GuarantorObligationsNumberofSubsidiariesUnderAgreement
Purchased surety bonds 133,000,000d_PurchasedSuretyBonds
Authorized issuance of standby letters of credit 48,000,000d_AuthorizedIssuanceOfStandbyLettersOfCredit
Debt  
Guarantor Obligations [Line Items]  
Stated Limit 27,000,000us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_DebtMember		 [2]
Value 27,000,000us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_DebtMember		 [1],[2]
Commodity transactions  
Guarantor Obligations [Line Items]  
Stated Limit 3,151,000,000us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_CommodityMember		 [3]
Value 919,000,000us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_CommodityMember		 [1],[3]
Nuclear obligations  
Guarantor Obligations [Line Items]  
Stated Limit 215,000,000us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_NuclearPlantMember		 [4]
Value 76,000,000us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_NuclearPlantMember		 [1],[4]
Solar  
Guarantor Obligations [Line Items]  
Stated Limit 531,000,000us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= d_SolarMember		 [5]
Value 396,000,000us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_GuaranteeObligationsByNatureAxis
= d_SolarMember		 [1],[5]
Other  
Guarantor Obligations [Line Items]  
Stated Limit 532,000,000us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_CapitalLeaseObligationsMember		 [6]
Value 35,000,000us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_CapitalLeaseObligationsMember		 [1],[6]
Virginia Electric and Power Company  
Guarantor Obligations [Line Items]  
Purchased surety bonds 64,000,000d_PurchasedSuretyBonds
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Virginia Electric and Power Company | Debt  
Guarantor Obligations [Line Items]  
Stated Limit 14,000,000us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_DebtMember
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Dominion Gas Holdings, LLC  
Guarantor Obligations [Line Items]  
Purchased surety bonds 30,000,000d_PurchasedSuretyBonds
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
Cove Point  
Guarantor Obligations [Line Items]  
Stated Limit 150,000,000us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_EnvironmentalExitCostByPropertyAxis
= d_CovePointMember
Number of guarantees with no stated limit 2d_GuarantorObligationsNumberofGuaranteeswithNoStatedLimit
/ us-gaap_EnvironmentalExitCostByPropertyAxis
= d_CovePointMember
Number of guarantees 1d_GuarantorObligationsNumberofGuarantees
/ us-gaap_EnvironmentalExitCostByPropertyAxis
= d_CovePointMember
Aggregate limit for guarantees 1,750,000,000d_GuarantorObligationsMaximumExposureAggregateLimit
/ us-gaap_EnvironmentalExitCostByPropertyAxis
= d_CovePointMember
Annual draw limit 175,000,000d_GuarantorObligationsMaximumExposureAnnualDrawLimit
/ us-gaap_EnvironmentalExitCostByPropertyAxis
= d_CovePointMember
Cove Point | Nuclear obligations  
Guarantor Obligations [Line Items]  
Stated Limit 1,910,000,000us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_EnvironmentalExitCostByPropertyAxis
= d_CovePointMember
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_NuclearPlantMember		 [7]
Value 0us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_EnvironmentalExitCostByPropertyAxis
= d_CovePointMember
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_NuclearPlantMember		 [1],[7]
Millstone | Nuclear obligations  
Guarantor Obligations [Line Items]  
Stated Limit 150,000,000d_StatedLimit
/ us-gaap_EnvironmentalExitCostByPropertyAxis
= d_MillstonePowerStationMember
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_NuclearPlantMember
Kewaunee | Nuclear obligations  
Guarantor Obligations [Line Items]  
Stated Limit $ 60,000,000d_StatedLimit
/ us-gaap_EnvironmentalExitCostByPropertyAxis
= d_KewauneePowerStationMember
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_NuclearPlantMember
[1] Represents the estimated portion of the guarantee's stated limit that is utilized as of December 31, 2014 based upon prevailing economic conditions and fact patterns specific to each guarantee arrangement. For those guarantees related to obligations that are recorded as liabilities by Dominion's subsidiaries, the value includes the recorded amount.
[2] Guarantee of debt of a DEI subsidiary. In the event of default by the subsidiary, Dominion would be obligated to repay such amounts.
[3] Guarantees related to commodity commitments of certain subsidiaries, including subsidiaries of Virginia Power, Dominion Gas and DEI. These guarantees were provided to counterparties in order to facilitate physical and financial transactions in gas, oil, electricity, pipeline capacity, transportation and related commodities and services. If any of these subsidiaries fail to perform or pay under the contracts and the counterparties seek performance or payment, Dominion would be obligated to satisfy such obligation. Dominion and its subsidiaries receive similar guarantees as collateral for credit extended to others. The value provided includes certain guarantees that do not have stated limits.
[4] Guarantees related to certain DEI subsidiaries' potential retrospective premiums that could be assessed if there is a nuclear incident under Dominion's nuclear insurance programs and guarantees for a DEI subsidiary's and Virginia Power's commitment to buy nuclear fuel. Excludes Dominion's agreement to provide up to $150 million and $60 million to two DEI subsidiaries to pay the operating expenses of Millstone (in the event of a prolonged outage) and Kewaunee, respectively, as part of satisfying certain NRC requirements concerned with ensuring adequate funding for the operations of nuclear power stations. The agreement for Kewaunee also provides for funds through the completion of decommissioning.
[5] Includes guarantees to facilitate the development of solar projects including guarantees to support the issuance of full notice to proceed under EPC agreements. Includes certain guarantees that do not have stated limits. Also includes guarantees entered into by DEI on behalf of certain subsidiaries to facilitate the acquisition and development of solar projects.
[6] Guarantees related to other miscellaneous contractual obligations such as leases, environmental obligations and construction projects. Also includes guarantees related to certain DEI subsidiaries' obligations for equity capital contributions and energy generation associated with Fowler Ridge and NedPower. As of December 31, 2014, Dominion's maximum remaining cumulative exposure under these equity funding agreements is $72 million through 2019 and its maximum annual future contributions could range from approximately $4 million to $19 million. The value provided includes certain guarantees that do not have stated limits.
[7] Guarantees related to Cove Point, in support of terminal services, transportation and construction. Two of the guarantees have no stated limit, one guarantee has a $150 million limit, and one guarantee has a $1.75 billion aggregate limit with an annual draw limit of $175 million.