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Long-Term Debt (Narrative) (Details) (USD $)
 1 Months Ended 12 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended
Jan. 31, 2013
Sep. 30, 2011
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jul. 31, 2017
Jul. 31, 2016
Apr. 30, 2016
Jul. 31, 2014
Jun. 30, 2013
Feb. 28, 2012
Dec. 31, 2014
Nov. 30, 2014
Oct. 01, 2024
Jun. 30, 2014
Jul. 01, 2014
Jul. 01, 2006
Jun. 30, 2006
Sep. 30, 2006
Oct. 31, 2014
Jun. 30, 2009
Debt Instrument [Line Items]                                          
Aggregate outstanding principal amount     $ 23,200,000,000us-gaap_LongTermDebt                 $ 23,200,000,000us-gaap_LongTermDebt                  
Make-whole premium amount     284,000,000us-gaap_RedemptionPremium 0us-gaap_RedemptionPremium 0us-gaap_RedemptionPremium                                
Shares issued in excess of principal amounts related to converted securities       28,000,000us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities                                  
Noncontrolling interest, ownership percentage by parent     100.00%us-gaap_MinorityInterestOwnershipPercentageByParent                 100.00%us-gaap_MinorityInterestOwnershipPercentageByParent                  
Beneficial ownership percentage     97.00%d_BeneficialOwnershipPercentage                                    
Beneficial ownership interest     3.00%d_BeneficialOwnershipInterest                                    
Percentage in capital trust assets     100.00%d_PercentageInCapitalTrustAssets                                    
Redemption of units of Dominion Resources Capital Trust I capital securities 250,000us-gaap_AuctionMarketPreferredSecuritiesSharesRedeemed                                        
Dominion Resources Capital Trust I capital securities 250,000,000us-gaap_AuctionMarketPreferredSecuritiesStockSeriesValue                                        
Rate of Dominion Resources Capital Trust I capital securities 7.83%us-gaap_AuctionMarketPreferredSecuritiesStockSeriesVariableInterestRateEarned                                        
Redemption price per capital security $ 1,019.58us-gaap_AuctionMarketPreferredSecuritiesStockSeriesPerShareRedemptionAmount                                        
Deferral     10 years                                    
Period for consideration of proceeds (days)   180 days 365 days                                    
Interest in RSN issued by Dominion (percentage)     5.00%d_PercentageInterestInRemarketableSubordinatedNote                 5.00%d_PercentageInterestInRemarketableSubordinatedNote                  
Shares reserved and available for issuance     7,000,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance                 7,000,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance                  
Dominion Gas Holdings, LLC                                          
Debt Instrument [Line Items]                                          
Aggregate outstanding principal amount     2,600,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember		                 2,600,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember		                  
Scenario, Forecast | Minimum                                          
Debt Instrument [Line Items]                                          
Shares to be issued under purchase contracts           11,500,000d_SharesToBeIssuedUnderStockPurchaseContracts
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		 8,400,000d_SharesToBeIssuedUnderStockPurchaseContracts
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		 8,400,000d_SharesToBeIssuedUnderStockPurchaseContracts
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		                          
Scenario, Forecast | Maximum                                          
Debt Instrument [Line Items]                                          
Shares to be issued under purchase contracts           14,300,000d_SharesToBeIssuedUnderStockPurchaseContracts
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		 9,900,000d_SharesToBeIssuedUnderStockPurchaseContracts
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		 9,900,000d_SharesToBeIssuedUnderStockPurchaseContracts
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		                          
Common Stock                                          
Debt Instrument [Line Items]                                          
Purchase price to be paid under stock purchase contracts     $ 50d_PurchasePricePerShareUnderStockPurchaseContract
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		                 $ 50d_PurchasePricePerShareUnderStockPurchaseContract
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		                  
Shares reserved and available for issuance     40,300,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		                 40,300,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		                  
Capital Unit, Class A                                          
Debt Instrument [Line Items]                                          
Issuance of Dominion Midstream common units, net of offering costs                 1,000,000,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassAMember		 550,000,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassAMember		                      
Payment rate on Equity Units                   6.125%d_EquityUnitsCompoundedContractAdjustmentPaymentRate
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassAMember		           6.375%d_EquityUnitsCompoundedContractAdjustmentPaymentRate
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassAMember		          
Capital Unit, Class B                                          
Debt Instrument [Line Items]                                          
Issuance of Dominion Midstream common units, net of offering costs                   550,000,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassBMember		                      
Payment rate on Equity Units                   6.00%d_EquityUnitsCompoundedContractAdjustmentPaymentRate
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CapitalUnitClassBMember		                      
June 2006 hybrids                                          
Debt Instrument [Line Items]                                          
Interest rate (percentage)                                 2.825%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAxis
= d_June2006HybridsMember		 7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAxis
= d_June2006HybridsMember		      
Junior subordinated notes                                   300,000,000us-gaap_JuniorSubordinatedNotes
/ us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAxis
= d_June2006HybridsMember		      
September 2006 hybrids                                          
Debt Instrument [Line Items]                                          
Interest rate (percentage)   2.30%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAxis
= d_September2006HybridsMember		                                      
Junior subordinated notes                                     500,000,000us-gaap_JuniorSubordinatedNotes
/ us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAxis
= d_September2006HybridsMember		    
Tender offer to purchase additional hybrids                     150,000,000d_TenderOfferToRepurchaseHybridSubordinatedNotes
/ us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAxis
= d_September2006HybridsMember		                    
Purchased and cancelled of junior subordinated notes         88,000,000d_PurchasedAndCancelledOfJuniorSubordinatedNotes
/ us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAxis
= d_September2006HybridsMember		                                
June 2009 hybrids                                          
Debt Instrument [Line Items]                                          
Interest rate (percentage)                                         8.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAxis
= d_June2009HybridsMember
Aggregate redemption price paid                                       685,000,000us-gaap_DebtInstrumentRepurchaseAmount
/ us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAxis
= d_June2009HybridsMember		  
Junior subordinated notes                                         685,000,000us-gaap_JuniorSubordinatedNotes
/ us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAxis
= d_June2009HybridsMember
7.83% Debentures due 12/1/2027                                          
Debt Instrument [Line Items]                                          
Interest rate (percentage) 7.83%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ invest_InvestmentAxis
= d_A783PercentDebenturesDue12012027Member		                                        
Junior subordinated notes 258,000,000us-gaap_JuniorSubordinatedNotes
/ invest_InvestmentAxis
= d_A783PercentDebenturesDue12012027Member		                                        
Convertible Debt                                          
Debt Instrument [Line Items]                                          
Outstanding contingent convertible senior notes     0us-gaap_ConvertibleLongTermNotesPayable
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		                 0us-gaap_ConvertibleLongTermNotesPayable
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		 22,000,000us-gaap_ConvertibleLongTermNotesPayable
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		                
Average trading price principal amount of the senior notes                         120.00%d_AverageTradingPricePrincipalAmountOfSeniorNotes
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		                
Minimum consecutive trading days                         20 days                
Maximum consecutive trading days                         30 days                
Amount of notes converted by holders     21,000,000us-gaap_DebtConversionConvertedInstrumentAmount1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		                                    
Shares issued in excess of principal amounts related to converted securities     23,000,000us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		                 26,000,000us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		                  
Unsecured Junior Subordinated Notes Payable to Affiliated Trusts                                          
Debt Instrument [Line Items]                                          
Aggregate outstanding principal amount     10,000,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember		                 10,000,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember		                  
Interest charges     1,000,000us-gaap_InterestExpenseDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember		 1,000,000us-gaap_InterestExpenseDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember		 21,000,000us-gaap_InterestExpenseDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember		                                
Unsecured Junior Subordinated Notes Payable to Affiliated Trusts | Enhanced Junior Subordinated Notes, 5.75%                                          
Debt Instrument [Line Items]                                          
Interest rate (percentage)                                       5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= d_EnhancedJuniorSubordinatedNotes5.75Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember		  
Principal amount of notes                                       685,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= d_EnhancedJuniorSubordinatedNotes5.75Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember		  
Unsecured Junior Subordinated Notes Payable to Affiliated Trusts | LIBOR | Scenario, Forecast | Enhanced Junior Subordinated Notes, 5.75%                                          
Debt Instrument [Line Items]                                          
Spread on variable rate                           3.057%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= d_EnhancedJuniorSubordinatedNotes5.75Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		              
Senior Notes                                          
Debt Instrument [Line Items]                                          
Aggregate outstanding principal amount     1,900,000,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		                 1,900,000,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		                  
Aggregate redemption price paid     2,200,000,000us-gaap_DebtInstrumentRepurchaseAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		                 2,200,000,000us-gaap_DebtInstrumentRepurchaseAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		                  
Make-whole premium amount                       263,000,000us-gaap_RedemptionPremium
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		                  
Interest charges                       284,000,000us-gaap_InterestExpenseDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		                  
Senior Notes | Dominion Gas Holdings, LLC                                          
Debt Instrument [Line Items]                                          
Principal amount offered in exchange                             $ 1,200,000,000d_DebtInstrumentPrincipalAmountOfferedInExchange
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		            
Senior Notes | Series C 2005 Senior Notes Due 2015                                          
Debt Instrument [Line Items]                                          
Interest rate (percentage)     5.15%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= d_SeriesC2005SeniorNotesDue2015Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		                 5.15%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= d_SeriesC2005SeniorNotesDue2015Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		                  
Senior Notes | Series A 2004 Senior Notes Due 2016                                          
Debt Instrument [Line Items]                                          
Interest rate (percentage)     5.20%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= d_SeriesA2004SeniorNotesDue2016Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		                 5.20%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= d_SeriesA2004SeniorNotesDue2016Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		                  
Senior Notes | Series A 2006 Senior Notes Due 2016                                          
Debt Instrument [Line Items]                                          
Interest rate (percentage)     5.60%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= d_SeriesA2006SeniorNotesDue2016Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		                 5.60%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= d_SeriesA2006SeniorNotesDue2016Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		                  
Senior Notes | Series A 2007 Senior Notes Due 2017                                          
Debt Instrument [Line Items]                                          
Interest rate (percentage)     6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= d_SeriesA2007SeniorNotesDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		                 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= d_SeriesA2007SeniorNotesDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		                  
Senior Notes | Series D 2008 Senior Notes Due 2019                                          
Debt Instrument [Line Items]                                          
Interest rate (percentage)     8.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= d_SeriesD2008SeniorNotesDue2019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		                 8.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= d_SeriesD2008SeniorNotesDue2019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember