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Fair Value Measurements (Financial Instruments' Carrying Amounts and Fair Values) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, including securities due within one year   $ 23,200us-gaap_LongTermDebt
Subsidiary preferred stock 257us-gaap_PreferredStockValueOutstanding 0us-gaap_PreferredStockValueOutstanding
Valuation of certain fair value hedges 55us-gaap_InterestRateFairValueHedgeDerivativeAtFairValueNet 19us-gaap_InterestRateFairValueHedgeDerivativeAtFairValueNet
Deferred issuance expenses 2us-gaap_PaymentsOfStockIssuanceCosts  
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, including securities due within one year 18,396us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 [1] 19,723us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 [1]
Junior subordinated notes 1,373us-gaap_SubordinatedLongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 [2] 1,374us-gaap_SubordinatedLongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 [2]
Remarketable subordinated notes 1,080d_RemarketableSubordinatedNotesFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 [2] 2,083d_RemarketableSubordinatedNotesFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 [2]
Subsidiary preferred stock 257us-gaap_PreferredStockValueOutstanding
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 [3] 0us-gaap_PreferredStockValueOutstanding
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 [3]
Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, including securities due within one year 19,887us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 [1],[4] 21,881us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 [1],[4]
Junior subordinated notes 1,394us-gaap_SubordinatedLongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 [2],[4] 1,396us-gaap_SubordinatedLongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 [2],[4]
Remarketable subordinated notes 1,192d_RemarketableSubordinatedNotesFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 [2],[4] 2,362d_RemarketableSubordinatedNotesFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 [2],[4]
Subsidiary preferred stock 261us-gaap_PreferredStockValueOutstanding
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 [3],[4] 0us-gaap_PreferredStockValueOutstanding
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 [3],[4]
Virginia Electric and Power Company    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, including securities due within one year   8,935us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Subsidiary preferred stock 257us-gaap_PreferredStockValueOutstanding
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 0us-gaap_PreferredStockValueOutstanding
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Virginia Electric and Power Company | Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, including securities due within one year 8,032us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 [2] 8,937us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 [2]
Subsidiary preferred stock 257us-gaap_PreferredStockValueOutstanding
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 [3] 0us-gaap_PreferredStockValueOutstanding
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 [3]
Virginia Electric and Power Company | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, including securities due within one year 8,897us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 [2],[4] 10,293us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 [2],[4]
Subsidiary preferred stock 261us-gaap_PreferredStockValueOutstanding
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 [3],[4] 0us-gaap_PreferredStockValueOutstanding
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 [3],[4]
Dominion Gas Holdings, LLC    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, including securities due within one year   2,600us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
Dominion Gas Holdings, LLC | Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, including securities due within one year 1,198us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember		 [2] 2,594us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember		 [2]
Dominion Gas Holdings, LLC | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, including securities due within one year $ 1,169us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember		 [2],[4] $ 2,672us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember		 [2],[4]
[1] Carrying amount includes amounts which represent the unamortized discount and/or premium. At December 31, 2014, and 2013, includes the valuation of certain fair value hedges associated with Dominion's fixed rate debt, of approximately $19 million and $55 million, respectively.
[2] Carrying amount includes amounts which represent the unamortized discount and/or premium.
[3] Includes deferred issuance expenses of $2 million at December 31, 2013. See Note 18 for information about the redemption of preferred stock in 2014.
[4] Fair value is estimated using market prices, where available, and interest rates currently available for issuance of debt with similar terms and remaining maturities. All fair value measurements are classified as Level 2. The carrying amount of debt issues with short-term maturities and variable rates refinanced at current market rates is a reasonable estimate of their fair value.