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Consolidated Statements of Cash Flows (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Operating Activities    
Net income including noncontrolling interests $ 540us-gaap_ProfitLoss $ 385us-gaap_ProfitLoss
Net income 536us-gaap_NetIncomeLoss 379us-gaap_NetIncomeLoss
Adjustments to reconcile net income including noncontrolling interests to net cash provided by operating activities:    
Depreciation and amortization (including nuclear fuel) 414d_DepreciationDepletionAndAmortizationIncludingNuclearFuel 378d_DepreciationDepletionAndAmortizationIncludingNuclearFuel
Deferred income taxes and investment tax credits 277us-gaap_IncreaseDecreaseInDeferredIncomeTaxes 232us-gaap_IncreaseDecreaseInDeferredIncomeTaxes
Gains on the sale of assets and businesses (70)us-gaap_RealizedInvestmentGainsLosses (159)us-gaap_RealizedInvestmentGainsLosses
Other adjustments (40)us-gaap_OtherNoncashIncomeExpense (34)us-gaap_OtherNoncashIncomeExpense
Changes in:    
Accounts receivable (65)us-gaap_IncreaseDecreaseInAccountsReceivable (183)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories 148us-gaap_IncreaseDecreaseInInventories 163us-gaap_IncreaseDecreaseInInventories
Deferred fuel and purchased gas costs, net (33)us-gaap_IncreaseDecreaseInDeferredFuelCosts (304)us-gaap_IncreaseDecreaseInDeferredFuelCosts
Accounts payable (85)us-gaap_IncreaseDecreaseInAccountsPayable 53us-gaap_IncreaseDecreaseInAccountsPayable
Accrued interest, payroll and taxes (15)us-gaap_IncreaseDecreaseInAccruedLiabilities (55)us-gaap_IncreaseDecreaseInAccruedLiabilities
Margin deposit assets and liabilities 111us-gaap_IncreaseDecreaseInMarginDepositsOutstanding 105us-gaap_IncreaseDecreaseInMarginDepositsOutstanding
Other operating assets and liabilities (51)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet 172us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Net cash provided by operating activities 1,131us-gaap_NetCashProvidedByUsedInOperatingActivities 753us-gaap_NetCashProvidedByUsedInOperatingActivities
Investing Activities    
Plant construction and other property additions (including nuclear fuel) (1,014)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (1,120)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Acquisition of solar development projects 0us-gaap_PaymentsToAcquireProjects (47)us-gaap_PaymentsToAcquireProjects
Acquisition of DCGT (495)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired 0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Proceeds from sales of securities 337us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities 442us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities
Purchases of securities (304)us-gaap_PaymentsToAcquireMarketableSecurities (441)us-gaap_PaymentsToAcquireMarketableSecurities
Proceeds from the sale of electric retail energy marketing business 0us-gaap_ProceedsFromDivestitureOfInterestInSubsidiariesAndAffiliates 187us-gaap_ProceedsFromDivestitureOfInterestInSubsidiariesAndAffiliates
Proceeds from the sale of assets to Blue Racer 0us-gaap_ProceedsFromSaleOfProductiveAssets 84us-gaap_ProceedsFromSaleOfProductiveAssets
Proceeds from assignments of Marcellus acreage 27us-gaap_ProceedsFromDivestitureOfBusinesses 0us-gaap_ProceedsFromDivestitureOfBusinesses
Other (50)us-gaap_PaymentsForProceedsFromOtherInvestingActivities (24)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash used in investing activities (1,499)us-gaap_NetCashProvidedByUsedInInvestingActivities (919)us-gaap_NetCashProvidedByUsedInInvestingActivities
Financing Activities    
Issuance of short-term debt, net 425us-gaap_ProceedsFromRepaymentsOfShortTermDebt 45us-gaap_ProceedsFromRepaymentsOfShortTermDebt
Issuance of long-term debt 0us-gaap_ProceedsFromIssuanceOfLongTermDebt 1,150us-gaap_ProceedsFromIssuanceOfLongTermDebt
Repayment and repurchase of long-term debt (3)us-gaap_RepaymentsOfLongTermDebt (608)us-gaap_RepaymentsOfLongTermDebt
Subsidiary preferred stock redemption 0us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock (125)us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock
Issuance of common stock 295us-gaap_ProceedsFromIssuanceOfCommonStock 0us-gaap_ProceedsFromIssuanceOfCommonStock
Common dividend payments (381)us-gaap_PaymentsOfDividendsCommonStock (349)us-gaap_PaymentsOfDividendsCommonStock
Distributions to Dominion Midstream public unitholders (3)d_PaymentsofDistributionstoUnitholders 0d_PaymentsofDistributionstoUnitholders
Subsidiary preferred dividend payments 0us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock (4)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock
Other (8)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities (31)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Net cash provided by financing activities 325us-gaap_NetCashProvidedByUsedInFinancingActivities 78us-gaap_NetCashProvidedByUsedInFinancingActivities
Decrease in cash and cash equivalents (43)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (88)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 318us-gaap_CashAndCashEquivalentsAtCarryingValue [1] 316us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period 275us-gaap_CashAndCashEquivalentsAtCarryingValue 228us-gaap_CashAndCashEquivalentsAtCarryingValue
Significant noncash investing activities:    
Accrued capital expenditures 353us-gaap_CapitalExpendituresIncurredButNotYetPaid 261us-gaap_CapitalExpendituresIncurredButNotYetPaid
Virginia Electric and Power Company    
Operating Activities    
Net income 269us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
324us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Adjustments to reconcile net income including noncontrolling interests to net cash provided by operating activities:    
Depreciation and amortization (including nuclear fuel) 281d_DepreciationDepletionAndAmortizationIncludingNuclearFuel
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
263d_DepreciationDepletionAndAmortizationIncludingNuclearFuel
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Deferred income taxes and investment tax credits 67us-gaap_IncreaseDecreaseInDeferredIncomeTaxes
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
203us-gaap_IncreaseDecreaseInDeferredIncomeTaxes
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Other adjustments (7)us-gaap_OtherNoncashIncomeExpense
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
(12)us-gaap_OtherNoncashIncomeExpense
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Changes in:    
Accounts receivable (20)us-gaap_IncreaseDecreaseInAccountsReceivable
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
(9)us-gaap_IncreaseDecreaseInAccountsReceivable
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Inventories 85us-gaap_IncreaseDecreaseInInventories
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
91us-gaap_IncreaseDecreaseInInventories
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Deferred fuel and purchased gas costs, net (54)us-gaap_IncreaseDecreaseInDeferredFuelCosts
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
(328)us-gaap_IncreaseDecreaseInDeferredFuelCosts
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Prepayments 214us-gaap_IncreaseDecreaseInPrepaidExpense
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
(15)us-gaap_IncreaseDecreaseInPrepaidExpense
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Accounts payable 3us-gaap_IncreaseDecreaseInAccountsPayable
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
34us-gaap_IncreaseDecreaseInAccountsPayable
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Accrued interest, payroll and taxes 116us-gaap_IncreaseDecreaseInAccruedLiabilities
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
10us-gaap_IncreaseDecreaseInAccruedLiabilities
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Other operating assets and liabilities 7us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
39us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Net cash provided by operating activities 961us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
600us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Investing Activities    
Plant construction and other property additions (including nuclear fuel) (583)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
(691)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Purchases of nuclear fuel (23)us-gaap_PaymentsForNuclearFuel
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
(68)us-gaap_PaymentsForNuclearFuel
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Proceeds from sales of securities 133us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
204us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Purchases of securities (138)us-gaap_PaymentsToAcquireMarketableSecurities
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
(215)us-gaap_PaymentsToAcquireMarketableSecurities
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Other (11)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
(6)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Net cash used in investing activities (622)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
(776)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Financing Activities    
Issuance of short-term debt, net 227us-gaap_ProceedsFromRepaymentsOfShortTermDebt
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
(339)us-gaap_ProceedsFromRepaymentsOfShortTermDebt
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Issuance (repayment) of affiliated current borrowings, net (417)us-gaap_ProceedsFromRepaymentsOfRelatedPartyDebt
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
62us-gaap_ProceedsFromRepaymentsOfRelatedPartyDebt
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Issuance of long-term debt 0us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
750us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Subsidiary preferred stock redemption 0us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
(125)us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Common dividend payments (149)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
(149)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Subsidiary preferred dividend payments 0us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
(4)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Other 1us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
(11)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Net cash provided by financing activities (338)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
184us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Decrease in cash and cash equivalents 1us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
8us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Cash and cash equivalents at beginning of period 15us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
[2] 16us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Cash and cash equivalents at end of period 16us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
24us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Significant noncash investing activities:    
Accrued capital expenditures 139us-gaap_CapitalExpendituresIncurredButNotYetPaid
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
203us-gaap_CapitalExpendituresIncurredButNotYetPaid
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Dominion Gas Holdings, LLC    
Operating Activities    
Net income 161us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
164us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
Adjustments to reconcile net income including noncontrolling interests to net cash provided by operating activities:    
Depreciation and amortization 51us-gaap_DepreciationDepletionAndAmortization
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
47us-gaap_DepreciationDepletionAndAmortization
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
Deferred income taxes and investment tax credits 36us-gaap_IncreaseDecreaseInDeferredIncomeTaxes
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
27us-gaap_IncreaseDecreaseInDeferredIncomeTaxes
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
Gains on the sale of assets and businesses (70)us-gaap_RealizedInvestmentGainsLosses
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
(59)us-gaap_RealizedInvestmentGainsLosses
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
Other adjustments 3us-gaap_OtherNoncashIncomeExpense
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
(2)us-gaap_OtherNoncashIncomeExpense
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
Changes in:    
Accounts receivable (24)us-gaap_IncreaseDecreaseInAccountsReceivable
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
(154)us-gaap_IncreaseDecreaseInAccountsReceivable
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
Deferred fuel and purchased gas costs, net 16us-gaap_IncreaseDecreaseInDeferredFuelCosts
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
29us-gaap_IncreaseDecreaseInDeferredFuelCosts
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
Prepayments 102us-gaap_IncreaseDecreaseInPrepaidExpense
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
10us-gaap_IncreaseDecreaseInPrepaidExpense
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
Accounts payable (33)us-gaap_IncreaseDecreaseInAccountsPayable
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
(16)us-gaap_IncreaseDecreaseInAccountsPayable
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
Accrued interest, payroll and taxes 49us-gaap_IncreaseDecreaseInAccruedLiabilities
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
73us-gaap_IncreaseDecreaseInAccruedLiabilities
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
Other operating assets and liabilities (18)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
(6)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
Net cash provided by operating activities 273us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
113us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
Investing Activities    
Plant construction and other property additions (including nuclear fuel) (128)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
(107)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
Proceeds from sale of assets to an affiliate 0d_ProceedsfromSaleofProductiveAssetstoAffiliate
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
30d_ProceedsfromSaleofProductiveAssetstoAffiliate
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
Proceeds from the sale of assets to Blue Racer 27us-gaap_ProceedsFromSaleOfProductiveAssets
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
0us-gaap_ProceedsFromSaleOfProductiveAssets
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
Other (1)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
(2)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
Net cash used in investing activities (102)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
(79)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
Financing Activities    
Issuance of short-term debt, net 280us-gaap_ProceedsFromShortTermDebt
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
0us-gaap_ProceedsFromShortTermDebt
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
Issuance (repayment) of affiliated current borrowings, net (345)us-gaap_ProceedsFromRepaymentsOfRelatedPartyDebt
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
51us-gaap_ProceedsFromRepaymentsOfRelatedPartyDebt
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
Distribution payments (95)us-gaap_PaymentsOfCapitalDistribution
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
(78)us-gaap_PaymentsOfCapitalDistribution
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
Other (1)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
(1)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
Net cash provided by financing activities (161)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
(28)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
Decrease in cash and cash equivalents 10us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
6us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
Cash and cash equivalents at beginning of period 9us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
[3] 8us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
Cash and cash equivalents at end of period 19us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
14us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
Significant noncash investing activities:    
Accrued capital expenditures 22us-gaap_CapitalExpendituresIncurredButNotYetPaid
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
24us-gaap_CapitalExpendituresIncurredButNotYetPaid
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
Proceeds from sale of assets to affiliate not yet received 0d_ProceedsfromSaleofAssetstoAffiliateNotyetReceived
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
17d_ProceedsfromSaleofAssetstoAffiliateNotyetReceived
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
Extinguishment of affiliated long-term debt in exchange for assets sold to affiliate $ 0us-gaap_NotesReduction
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
$ 67us-gaap_NotesReduction
/ dei_LegalEntityAxis
= d_DominionGasHoldingsLLCMember
[1] Dominion’s Consolidated Balance Sheet at December 31, 2014 has been derived from the audited Consolidated Financial Statements at that date.
[2] Virginia Power’s Consolidated Balance Sheet at December 31, 2014 has been derived from the audited Consolidated Financial Statements at that date.
[3] Dominion Gas’ Consolidated Balance Sheet at December 31, 2014 has been derived from the audited Consolidated Financial Statements at that date.