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Short-Term Debt And Credit Agreements (Commercial Paper, Bank Loans, and Letters of Credit Outstanding, as well as Capacity Available Under Credit Facilities (Details) (USD $)
Dec. 31, 2014
Facility
Dec. 31, 2013
May 31, 2014
May 01, 2014
Jul. 31, 2014
Jul. 01, 2014
Jan. 31, 2015
Short term Debt [Line Items]              
Facility Limit $ 4,500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity $ 3,500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity          
Outstanding Commercial Paper 2,775,000,000us-gaap_LongtermCommercialPaperCurrentAndNoncurrent [1] 1,927,000,000us-gaap_LongtermCommercialPaperCurrentAndNoncurrent [1]          
Outstanding Letters of Credit 48,000,000us-gaap_DebtorInPossessionFinancingLettersOfCreditOutstanding 11,000,000us-gaap_DebtorInPossessionFinancingLettersOfCreditOutstanding          
Facility Capacity Available 1,677,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity 1,562,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity          
Weighted-average interest rates of the outstanding commercial paper 0.38%us-gaap_ShortTermDebtWeightedAverageInterestRate 0.33%us-gaap_ShortTermDebtWeightedAverageInterestRate          
Number of joint revolving credit facilities 2d_DebtInstrumentNumberofCreditFacilities            
Virginia Electric and Power Company              
Short term Debt [Line Items]              
Facility Limit 1,500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 1,250,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		          
Outstanding Commercial Paper 1,361,000,000us-gaap_LongtermCommercialPaperCurrentAndNoncurrent
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 [2] 842,000,000us-gaap_LongtermCommercialPaperCurrentAndNoncurrent
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 [2]          
Outstanding Letters of Credit 0us-gaap_DebtorInPossessionFinancingLettersOfCreditOutstanding
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 1,000,000us-gaap_DebtorInPossessionFinancingLettersOfCreditOutstanding
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		          
Facility Capacity Available 139,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 407,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		          
Weighted-average interest rates of the outstanding commercial paper 0.36%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 0.33%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		          
Credit facility 120,000,000us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		            
Credit Facility 4 Billion              
Short term Debt [Line Items]              
Facility Limit 4,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFourBillionMember		 [3] 3,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFourBillionMember		 [3] 4,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFourBillionMember		 3,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFourBillionMember		      
Outstanding Commercial Paper 2,664,000,000us-gaap_LongtermCommercialPaperCurrentAndNoncurrent
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFourBillionMember		 [3] 1,927,000,000us-gaap_LongtermCommercialPaperCurrentAndNoncurrent
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFourBillionMember		 [3]          
Outstanding Letters of Credit 0us-gaap_DebtorInPossessionFinancingLettersOfCreditOutstanding
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFourBillionMember		 [3] 0us-gaap_DebtorInPossessionFinancingLettersOfCreditOutstanding
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFourBillionMember		 [3]          
Facility Capacity Available 1,336,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFourBillionMember		 [3] 1,073,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFourBillionMember		 [3]          
Credit facility, to support letters of credit 1,500,000,000.0us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFourBillionMember		            
Credit Facility 4 Billion | Virginia Electric and Power Company              
Short term Debt [Line Items]              
Facility Limit 1,250,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFourBillionMember
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 [4] 1,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFourBillionMember
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 [4]     1,250,000,000.00us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFourBillionMember
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 1,000,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFourBillionMember
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		  
Outstanding Commercial Paper 1,250,000,000us-gaap_LongtermCommercialPaperCurrentAndNoncurrent
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFourBillionMember
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 [4] 842,000,000us-gaap_LongtermCommercialPaperCurrentAndNoncurrent
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFourBillionMember
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 [4]          
Outstanding Letters of Credit 0us-gaap_DebtorInPossessionFinancingLettersOfCreditOutstanding
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFourBillionMember
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 [4] 0us-gaap_DebtorInPossessionFinancingLettersOfCreditOutstanding
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFourBillionMember
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 [4]          
Facility Capacity Available 0us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFourBillionMember
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 [4] 158,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFourBillionMember
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 [4]          
Credit facility, to support letters of credit 1,500,000,000.0us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFourBillionMember
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		            
Credit Facility 4 Billion | Virginia Electric and Power Company | Subsequent Event              
Short term Debt [Line Items]              
Facility Limit             1,500,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFourBillionMember
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Credit Facility 4 Billion | Dominion Gas Holdings, LLC              
Short term Debt [Line Items]              
Facility Limit 1,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFourBillionMember
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember		            
Credit facility, to support letters of credit 500,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFourBillionMember
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember		            
Credit Facility 500 million              
Short term Debt [Line Items]              
Facility Limit 500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFiveHundredMillionMember		 [5] 500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFiveHundredMillionMember		 [5]          
Outstanding Commercial Paper 111,000,000us-gaap_LongtermCommercialPaperCurrentAndNoncurrent
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFiveHundredMillionMember		 [5] 0us-gaap_LongtermCommercialPaperCurrentAndNoncurrent
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFiveHundredMillionMember		 [5]          
Outstanding Letters of Credit 48,000,000us-gaap_DebtorInPossessionFinancingLettersOfCreditOutstanding
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFiveHundredMillionMember		 [5] 11,000,000us-gaap_DebtorInPossessionFinancingLettersOfCreditOutstanding
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFiveHundredMillionMember		 [5]          
Facility Capacity Available 341,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFiveHundredMillionMember		 [5] 489,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFiveHundredMillionMember		 [5]          
Credit Facility 500 million | Virginia Electric and Power Company              
Short term Debt [Line Items]              
Facility Limit 250,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFiveHundredMillionMember
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 [6] 250,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFiveHundredMillionMember
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 [6]          
Outstanding Commercial Paper 111,000,000us-gaap_LongtermCommercialPaperCurrentAndNoncurrent
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFiveHundredMillionMember
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 [6] 0us-gaap_LongtermCommercialPaperCurrentAndNoncurrent
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFiveHundredMillionMember
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 [6]          
Outstanding Letters of Credit 0us-gaap_DebtorInPossessionFinancingLettersOfCreditOutstanding
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFiveHundredMillionMember
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 [6] 1,000,000us-gaap_DebtorInPossessionFinancingLettersOfCreditOutstanding
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFiveHundredMillionMember
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 [6]          
Facility Capacity Available 139,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFiveHundredMillionMember
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 [6] 249,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFiveHundredMillionMember
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		 [6]          
Credit Facility 500 million | Dominion Gas Holdings, LLC              
Short term Debt [Line Items]              
Credit facility, to support letters of credit 0us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= d_CreditFacilityFiveHundredMillionMember
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember		            
Tax-Exempt Financings | Virginia Electric and Power Company              
Short term Debt [Line Items]              
Variable rate tax-exempt financings $ 119,000,000d_TaxExemptLongtermDebt
/ us-gaap_DebtInstrumentAxis
= d_TaxExemptDebtMember
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember		            
[1] The weighted-average interest rates of the outstanding commercial paper supported by Dominion's credit facilities were 0.38% and 0.33% at December 31, 2014 and 2013, respectively.
[2] The weighted-average interest rates of the outstanding commercial paper supported by these credit facilities were 0.36% and 0.33% at December 31, 2014 and 2013, respectively.
[3] In May 2014, this credit facility was amended and restated. The facility limit was increased from $3 billion to $4 billion and the maturity date was extended from September 2018 to April 2019. This credit facility can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $1.5 billion of letters of credit.
[4] In May 2014, this credit facility was amended and restated and the maturity date was extended from September 2018 to April 2019. This credit facility can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $1.5 billion (or the sub-limit, whichever is less) of letters of credit. Virginia Power's current sub-limit under this credit facility can be increased or decreased multiple times per year. In July 2014, Virginia Power increased its sub-limit from $1.0 billion to $1.25 billion. In January 2015, Virginia Power increased its sub-limit on this facility from $1.25 billion to $1.5 billion
[5] In May 2014, this credit facility was amended and restated and the maturity date was extended from September 2018 to April 2019. This credit facility can be used to support bank borrowings, commercial paper and letter of credit issuances.
[6] In May 2014, this credit facility was amended and restated and the maturity date was extended from September 2018 to April 2019. This credit facility can be used to support bank borrowings, commercial paper and letter of credit issuances. Virginia Power's current sub-limit under this credit facility can be increased or decreased multiple times per year.