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Commitments and Contingencies (Subsidiary Guarantees) (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
guarantee
Commitments and Contingencies [Line Items]  
Stated Limit $ 6,011,000,000us-gaap_GuaranteeObligationsMaximumExposure
Value 1,388,000,000us-gaap_GuaranteeObligationsCurrentCarryingValue [1]
Number of DEI subsidiaries 2d_GuarantorObligationsNumberofSubsidiariesUnderAgreement
Minimum  
Commitments and Contingencies [Line Items]  
Annual future contributions 4,000,000d_AnnualFutureContributions
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum  
Commitments and Contingencies [Line Items]  
Annual future contributions 19,000,000d_AnnualFutureContributions
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Third Party and Equity Method Investee  
Commitments and Contingencies [Line Items]  
Stated Limit 39,000,000us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis
= d_ThirdPartyAndEquityMethodInvesteeMember
Cove Point  
Commitments and Contingencies [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 1,750,000,000d_GuarantorObligationsMaximumExposureAggregateLimit
/ us-gaap_EnvironmentalExitCostByPropertyAxis
= d_CovePointMember
Annual draw limit 175,000,000d_GuarantorObligationsMaximumExposureAnnualDrawLimit
/ us-gaap_EnvironmentalExitCostByPropertyAxis
= d_CovePointMember
Subsidiary Debt  
Commitments and Contingencies [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  
Commitments and Contingencies [Line Items]  
Stated Limit 2,816,000,000us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_CommodityMember		 [3]
Value 1,075,000,000us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_CommodityMember		 [1],[3]
Nuclear Obligations  
Commitments and Contingencies [Line Items]  
Stated Limit 199,000,000us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_NuclearPlantMember		 [4]
Value 79,000,000us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_NuclearPlantMember		 [1],[4]
Nuclear Obligations | Millstone  
Commitments and Contingencies [Line Items]  
Stated Limit 150,000,000d_StatedLimit
/ us-gaap_EnvironmentalExitCostByPropertyAxis
= d_MillstonePowerStationMember
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_NuclearPlantMember
Nuclear Obligations | Kewaunee  
Commitments and Contingencies [Line Items]  
Stated Limit 60,000,000d_StatedLimit
/ us-gaap_EnvironmentalExitCostByPropertyAxis
= d_KewauneePowerStationMember
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_NuclearPlantMember
Cove Point  
Commitments and Contingencies [Line Items]  
Stated Limit 1,910,000,000us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= d_DominionCovePointLNGLPMember		 [5]
Value 0us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_GuaranteeObligationsByNatureAxis
= d_DominionCovePointLNGLPMember		 [1],[5]
Solar  
Commitments and Contingencies [Line Items]  
Stated Limit 531,000,000us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= d_SolarMember		 [6]
Value 171,000,000us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_GuaranteeObligationsByNatureAxis
= d_SolarMember		 [1],[6]
Other  
Commitments and Contingencies [Line Items]  
Stated Limit 528,000,000us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_GuaranteeTypeOtherMember		 [7]
Value 36,000,000us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_GuaranteeTypeOtherMember		 [1],[7]
Through 2019 | Third Party and Equity Method Investee  
Commitments and Contingencies [Line Items]  
Stated Limit $ 63,000,000us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= d_Through2019Member
/ us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis
= d_ThirdPartyAndEquityMethodInvesteeMember
[1] Represents the estimated portion of the guarantee's stated limit that is utilized as of March 31, 2015 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] 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.
[6] 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.
[7] 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 March 31, 2015, Dominion's maximum remaining cumulative exposure under these equity funding agreements is $63 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.