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Related Party Transactions (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Related Party Transaction [Line Items]      
Derivative Asset $ 679,000,000us-gaap_DerivativeAssets   $ 719,000,000us-gaap_DerivativeAssets
Derivative Liabilities 765,000,000us-gaap_DerivativeLiabilities   794,000,000us-gaap_DerivativeLiabilities
Virginia Electric and Power Company      
Related Party Transaction [Line Items]      
Derivative Asset 106,000,000us-gaap_DerivativeAssets
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		   113,000,000us-gaap_DerivativeAssets
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Derivative Liabilities 139,000,000us-gaap_DerivativeLiabilities
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		   87,000,000us-gaap_DerivativeLiabilities
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Commodity purchases from affiliates 252,000,000us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 202,000,000us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		  
Services provided to affiliates 110,000,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 [1] 108,000,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 [1]  
Sales of natural gas and transportation and storage services to affiliates 5,000,000us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 5,000,000us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		  
Outstanding borrowings, net of repayments, under money pool for non-regulated subsidiaries 0d_RelatedPartyOutstandingBorrowingForNonRegulatedSubsidiaries
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		   0d_RelatedPartyOutstandingBorrowingForNonRegulatedSubsidiaries
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Dominion Gas Holdings, LLC      
Related Party Transaction [Line Items]      
Amounts due from Dominion 4,000,000us-gaap_DueFromAffiliates
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember		 [2]   3,000,000us-gaap_DueFromAffiliates
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember		 [2]
Commodity purchases from affiliates 2,000,000us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember		 18,000,000us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember		  
Services provided to affiliates 20,000,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember		 13,000,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember		  
Sales of natural gas and transportation and storage services to affiliates 18,000,000us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember		 21,000,000us-gaap_RevenueFromRelatedParties
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember		  
Customer receivables from related parties 11,000,000us-gaap_AccountsReceivableRelatedPartiesCurrent
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember		 [3]   22,000,000us-gaap_AccountsReceivableRelatedPartiesCurrent
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember		 [3]
Affiliated notes receivable 10,000,000us-gaap_NotesReceivableRelatedParties
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember		 [4]   9,000,000us-gaap_NotesReceivableRelatedParties
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember		 [4]
Dominion Gas Holdings, LLC | Revolving Credit Facility | IRCA      
Related Party Transaction [Line Items]      
Borrowings under IRCA 39,000,000us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= d_IntercompanyRevolvingCreditAgreementMember
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember		   384,000,000us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= d_IntercompanyRevolvingCreditAgreementMember
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
Dominion Gas Holdings, LLC | Variable Interest Entity, Primary Beneficiary      
Related Party Transaction [Line Items]      
Customer receivables from related parties 5,000,000us-gaap_AccountsReceivableRelatedPartiesCurrent
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		   17,000,000us-gaap_AccountsReceivableRelatedPartiesCurrent
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Dominion Gas Holdings, LLC | Services provided by affiliates      
Related Party Transaction [Line Items]      
Commodity purchases from affiliates 34,000,000us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
/ us-gaap_RelatedPartyTransactionAxis
= d_ServicesProvidedbyAffiliatesMember		 [1] 28,000,000us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
/ us-gaap_RelatedPartyTransactionAxis
= d_ServicesProvidedbyAffiliatesMember		 [1]  
Affiliated Entity | Virginia Electric and Power Company | Commodity Derivative Contracts with Affiliates      
Related Party Transaction [Line Items]      
Derivative Asset 24,000,000us-gaap_DerivativeAssets
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
/ us-gaap_RelatedPartyTransactionAxis
= d_CommodityDerivativeContractswithAffiliatesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		    
Derivative Liabilities     7,000,000us-gaap_DerivativeLiabilities
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
/ us-gaap_RelatedPartyTransactionAxis
= d_CommodityDerivativeContractswithAffiliatesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
Principal Owner | Virginia Electric and Power Company      
Related Party Transaction [Line Items]      
Short term demand note 10,000,000us-gaap_OtherShortTermBorrowings
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_PrincipalOwnerMember		   427,000,000us-gaap_OtherShortTermBorrowings
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_PrincipalOwnerMember
Other deferred credits and other liabilities      
Related Party Transaction [Line Items]      
Amounts due to Dominion 243,000,000us-gaap_DueToAffiliateCurrentAndNoncurrent
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember		   219,000,000us-gaap_DueToAffiliateCurrentAndNoncurrent
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember
Other deferred charges and other assets      
Related Party Transaction [Line Items]      
Amounts due from Dominion $ 46,000,000us-gaap_DueFromAffiliates
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentAssetsMember		    
[1] Includes capitalized expenditures.
[2] Amounts are presented in other current assets in Dominion Gas' Consolidated Balance Sheets.
[3] Includes $5 million and $17 million due from Atlantic Coast Pipeline, a related party VIE, at March 31, 2015 and December 31, 2014, respectively.
[4] Amounts are presented in other deferred charges and other assets in Dominion Gas' Consolidated Balance Sheets.