XML 123 R106.htm IDEA: XBRL DOCUMENT
v3.19.1

Commitments and Contingencies (Narrative) (Detail) MMcf in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2019 USD ($) site MMcf | Aug. 31, 2018 USD ($) | Jul. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Sep. 30, 2017 Petition | Jun. 30, 2017 | Apr. 30, 2017 Petition station | Aug. 31, 2016 T | Apr. 30, 2015 Facility | Mar. 31, 2019 USD ($) Facility Indicator site gal MMcf | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) GasFiredUnit | Oct. 31, 2017 USD ($) | Oct. 31, 2015 ppb
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental Remediation Expense |  |  |  |  |  |  |  |  |  | $ (113) |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  | 835 | $ 1 |  |  |  |
Liabilities recorded | $ 72,455 |  |  |  |  |  |  |  |  | 72,455 |  | $ 55,866 | [1] |  |
Regulatory liability | 11,411 |  |  |  |  |  |  |  |  | 11,411 |  | 7,196 |  |  |
SCANA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory liability | 1,000 |  |  |  |  |  |  |  |  | 1,000 |  |  |  | $ 1,100 |
SCANA | DESC Ratepayer Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Escrow account |  |  |  |  |  |  |  |  |  |  |  | 2,000 |  |  |
Credit in future electric rate relief |  |  |  |  |  |  |  |  |  |  |  | 2,000 |  |  |
Cash payment |  |  |  |  |  |  |  |  |  |  |  | 115 |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  | 169 |  |  |  |  |
Asset impairment charges after tax |  |  |  |  |  |  |  |  |  | 126 |  |  |  |  |
DESC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities recorded | $ 20 |  |  |  |  |  |  |  |  | $ 20 |  |  |  |  |
Equity method investment, ownership percentage | 55.00% |  |  |  |  |  |  |  |  | 55.00% |  |  |  |  |
Contesting amount for filed liens in Fairfield country |  | $ 285 |  |  |  |  |  |  |  |  |  |  |  |  |
DESC | SCDOR [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportional share with NND project |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Proposed assessment amount from audit |  |  |  | $ 410 |  |  |  |  |  |  |  |  |  |  |
DESC | SOUTH CAROLINA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount claimed by plaintiffs in legal matter |  |  | $ 75 |  |  |  |  |  |  |  |  |  |  |  |
Proportional share with NND project |  |  | 55.00% |  |  |  |  |  |  |  |  |  |  |  |
Minimum | SCANA | DESC Ratepayer Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of property |  |  |  |  |  |  |  |  |  |  |  | 60 |  |  |
Maximum [Member] | SCANA | DESC Ratepayer Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of property |  |  |  |  |  |  |  |  |  |  |  | 85 |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental Remediation Expense |  |  |  |  |  |  |  |  |  | $ (113) |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  | 546 |  |  |  |  |
Liabilities recorded | $ 26,330 |  |  |  |  |  |  |  |  | 26,330 |  | 23,833 | [2] |  |
Regulatory liability | 5,089 |  |  |  |  |  |  |  |  | $ 5,089 |  | 4,946 |  |  |
Virginia Electric and Power Company | Cost of Landfills and Beneficial Reuse |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ARO incurred | 2,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Increase In Property Plant And Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ARO incurred | 1,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Future Ash Pond and Landfill Closure Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ARO incurred | 202 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Other operations and maintenance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ARO incurred | 113 |  |  |  |  |  |  |  |  |  |  |  |  |  |
ARO incurred, after tax | $ 84 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legislation requires for coal combustion residual | MMcf | 6.8 |  |  |  |  |  |  |  |  | 6.8 |  |  |  |  |
Virginia Electric and Power Company | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed revenue requirement | $ 225 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities recorded | 8,023 |  |  |  |  |  |  |  |  | $ 8,023 |  | 7,954 | [3] |  |
Regulatory liability | 1,317 |  |  |  |  |  |  |  |  | 1,317 |  | $ 1,306 |  |  |
Federal Energy Regulatory Commission | Virginia Electric and Power Company | Pending Litigation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory liability | $ 14 |  |  |  |  |  |  |  |  | $ 14 |  |  |  |  |
CWA | EPA | Final Rule to Revise Effluent Limitations Guidelines for Steam Electric Power Generating Category |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compliance date |  |  |  |  | 2023-12 |  |  |  |  |  |  |  |  |  |
CWA | EPA | 2015 Effluent Limitations Guidelines Rule for Steam Electric Power Generating Category |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compliance date |  |  |  |  | 2020-11 |  |  |  |  |  |  |  |  |  |
CCR | EPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of petition agreed for reconsideration | Petition |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |
Unfavorable Regulatory Action | EPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant emission rate per rear CO2 equivalent | T |  |  |  |  |  |  |  | 75,000 |  |  |  |  |  |  |
Electric generating station facilities heightened entrainment analysis per day | gal |  |  |  |  |  |  |  |  |  | 125,000,000 |  |  |  |  |
Unfavorable Regulatory Action | MATS | EPA | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of effective days to operate power station units |  |  |  |  |  | 90 days |  |  |  |  |  |  |  |  |
Unfavorable Regulatory Action | Ozone Standards | EPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Standard emission level prior to revision | ppb |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75
Revised emission standard level | ppb |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 70
Unfavorable Regulatory Action | Ozone Standards | EPA | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated compliance costs |  |  |  |  |  |  |  |  |  |  |  |  |  | 25 |
Unfavorable Regulatory Action | Ozone Standards | EPA | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated compliance costs |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 35 |
Unfavorable Regulatory Action | Ozone Standards | EPA | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of natural gas fired units to place at facility | GasFiredUnit |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |
Unfavorable Regulatory Action | CWA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities that may be subject to final regulations | Facility |  |  |  |  |  |  |  |  |  | 14 |  |  |  |  |
Unfavorable Regulatory Action | CWA | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of mandatory facility-specific factors | Indicator |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |
Number of optional facility-specific factors | Indicator |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |
Number of facilities that may be subject to final regulations | Facility |  |  |  |  |  |  |  |  |  | 8 |  |  |  |  |
Unfavorable Regulatory Action | CWA | Virginia Electric and Power Company | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric generating stations with water withdrawals per day | gal |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  |
Unfavorable Regulatory Action | CWA | EPA | Final Rule to Revise Effluent Limitations Guidelines for Steam Electric Power Generating Category |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of separate petitions for reconsideration granted | Petition |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
Unfavorable Regulatory Action | Coal Tar and Other Potentially Harmful Materials | EPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of former manufactured gas plant sites | site | 22 |  |  |  |  |  |  |  |  | 22 |  |  |  |  |
Unfavorable Regulatory Action | Coal Tar and Other Potentially Harmful Materials | EPA | Former Gas Plant Site with Post Closure Groundwater Monitoring Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of former sites | site |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Unfavorable Regulatory Action | Coal Tar and Other Potentially Harmful Materials | EPA | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of former manufactured gas plant sites | site | 3 |  |  |  |  |  |  |  |  | 3 |  |  |  |  |
Unfavorable Regulatory Action | Coal Tar and Other Potentially Harmful Materials | EPA | Virginia Electric and Power Company | Former Gas Plant Site with Post Closure Groundwater Monitoring Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated compliance costs |  |  |  | 18 |  |  |  |  |  |  |  |  |  |  |
Unfavorable Regulatory Action | Coal Tar and Other Potentially Harmful Materials | EPA | Virginia Electric and Power Company | Former Gas Plant Site with Post Closure Groundwater Monitoring Program | Other operations and maintenance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental Remediation Expense |  |  |  | 16 |  |  |  |  |  |  |  |  |  |  |
Environmental Remediation Expense, net of tax |  |  |  | $ 12 |  |  |  |  |  |  |  |  |  |  |
Unfavorable Regulatory Action | Coal Tar and Other Potentially Harmful Materials | EPA | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of former manufactured gas plant sites | site | 12 |  |  |  |  |  |  |  |  | 12 |  |  |  |  |
Unfavorable Regulatory Action | Coal Tar and Other Potentially Harmful Materials | EPA | SCANA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated compliance costs | $ 10 |  |  |  |  |  |  |  |  | $ 10 |  |  |  |  |
Number of sites under investigation, remediation and monitoring | site |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |
Number of sites with an updated remediation work plan | site |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Updated remediation work plan, cost increase |  |  |  |  |  |  |  |  |  | $ 8 |  |  |  |  |
Unfavorable Regulatory Action | CCR | EPA | Environmental Protection Agency Final Rule Regulating Management of CCRs | Facilities Subject to Coal Combustion Residual Final Rule |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities with CCR | Facility |  |  |  |  |  |  |  |  | 11 |  |  |  |  |  |
Unfavorable Regulatory Action | CCR | EPA | Virginia Electric and Power Company | Environmental Protection Agency Final Rule Regulating Management of CCRs | Facilities Subject to Coal Combustion Residual Final Rule |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities with CCR | Facility |  |  |  |  |  |  |  |  | 8 |  |  |  |  |  |
Number of stations | station |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |
[1] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.
[2] | Virginia Power’s Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.
[3] | Dominion Energy Gas’ Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.

X
- Definition Asset Impairment Charges After Tax + References No definition available. + Details
Name: | d_AssetImpairmentChargesAfterTax
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Asset retirement obligation liabilities incurred net of tax. + References No definition available. + Details
Name: | d_AssetRetirementObligationLiabilitiesIncurredNetOfTax
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Cash Payment For Settlements + References No definition available. + Details
Name: | d_CashPaymentForSettlements
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Contesting amount for filed liens. + References No definition available. + Details
Name: | d_ContestingAmountForFiledLiens
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Effective term to operate power station units. + References No definition available. + Details
Name: | d_EffectiveTermToOperatePowerStationUnits
Namespace Prefix: | d_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Environmental remediation expense, net of tax. + References No definition available. + Details
Name: | d_EnvironmentalRemediationExpenseNetofTax
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Estimated Proceeds From Sale Of Property Plant And Equipment + References No definition available. + Details
Name: | d_EstimatedProceedsFromSaleOfPropertyPlantAndEquipment
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Increase in environmental remediation expense. + References No definition available. + Details
Name: | d_IncreaseInEnvironmentalRemediationExpense
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Legislation requires for coal combustion residual. + References No definition available. + Details
Name: | d_LegislationRequiresForCoalCombustionResidual
Namespace Prefix: | d_
Data Type: | num:volumeItemType
Balance Type: | na
Period Type: | instant

X
- Definition Loss contingency compliance date + References No definition available. + Details
Name: | d_LossContingencyComplianceDate
Namespace Prefix: | d_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

X
- Definition Loss contingency number of facilities that may be subject to final regulations. + References No definition available. + Details
Name: | d_LossContingencyNumberOfFacilitiesThatMayBeSubjectToFinalRegulations
Namespace Prefix: | d_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Loss contingency number of separate petitions for reconsideration granted. + References No definition available. + Details
Name: | d_LossContingencyNumberOfSeparatePetitionsForReconsiderationGranted
Namespace Prefix: | d_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum credit amount in future electric rate relief. + References No definition available. + Details
Name: | d_MaximumCreditAmountInFutureElectricRateRelief
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of former manufactured gas plant sites. + References No definition available. + Details
Name: | d_NumberOfFormerManufacturedGasPlantSites
Namespace Prefix: | d_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of mandatory facility-specific factors + References No definition available. + Details
Name: | d_NumberOfMandatoryFacilitySpecificFactors
Namespace Prefix: | d_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of natural gas fired units to place at facility. + References No definition available. + Details
Name: | d_NumberOfNaturalGasFiredUnitsToPlaceAtFacility
Namespace Prefix: | d_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of optional facility-specific factors. + References No definition available. + Details
Name: | d_NumberOfOptionalFacilitySpecificFactors
Namespace Prefix: | d_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of petition agreed for reconsideration. + References No definition available. + Details
Name: | d_NumberOfPetitionAgreedForReconsideration
Namespace Prefix: | d_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of sites where investigations are in progress. + References No definition available. + Details
Name: | d_NumberOfSitesWhereInvestigationsAreInProgress
Namespace Prefix: | d_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of sites with updated remediation work plan. + References No definition available. + Details
Name: | d_NumberOfSitesWithUpdatedRemediationWorkPlan
Namespace Prefix: | d_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Proportional share percentage in settlement amount. + References No definition available. + Details
Name: | d_ProportionalSharePercentageInSettlementAmount
Namespace Prefix: | d_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public Utilities Electric Generating Station Facilities, Governed Under Rule, Water Withdrawals Levels + References No definition available. + Details
Name: | d_PublicUtilitiesElectricGeneratingStationFacilitiesGovernedUnderRuleWaterWithdrawalsLevels
Namespace Prefix: | d_
Data Type: | num:volumeItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public utilities electric generating station facilities heightened entrainment analysis. + References No definition available. + Details
Name: | d_PublicUtilitiesElectricGeneratingStationFacilitiesHeightenedEntrainmentAnalysis
Namespace Prefix: | d_
Data Type: | num:volumeItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public utilities number of facilities with coal combustion residual. + References No definition available. + Details
Name: | d_PublicUtilitiesNumberOfFacilitiesWithCoalCombustionResidual
Namespace Prefix: | d_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public utilities, number of stations with coal combustion residual. + References No definition available. + Details
Name: | d_PublicUtilitiesNumberOfStationsWithCoalCombustionResidual
Namespace Prefix: | d_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public Utilities, Requested Rate, Amount + References No definition available. + Details
Name: | d_PublicUtilitiesRequestedRateAmount
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Public utilities significant emission rate per year CO2 equivalent. + References No definition available. + Details
Name: | d_PublicUtilitiesSignificantEmissionRatePerYearCO2Equivalent
Namespace Prefix: | d_
Data Type: | num:massItemType
Balance Type: | na
Period Type: | duration

X
- Definition Revised standard level emission parts per billion. + References No definition available. + Details
Name: | d_RevisedEmissionStandardLevelPartsPerBillion
Namespace Prefix: | d_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Site contingency number of sites. + References No definition available. + Details
Name: | d_SiteContingencyNumberOfSites
Namespace Prefix: | d_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Standard emission level parts per billon prior to revision. + References No definition available. + Details
Name: | d_StandardEmissionLevelPartsPerBillionPriorToRevision
Namespace Prefix: | d_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
Name: | us-gaap_AssetImpairmentCharges
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of asset retirement obligations incurred during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
Name: | us-gaap_AssetRetirementObligationLiabilitiesIncurred
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109237650&loc=d3e13064-110858 Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13296-110859 + Details
Name: | us-gaap_EnvironmentalRemediationExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_EscrowDeposit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of estimated penalties recognized in the period arising from income tax examinations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
Name: | us-gaap_IncomeTaxExaminationPenaltiesExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19-26) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_Liabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The value (monetary amount) of the award the plaintiff seeks in the legal matter. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
Name: | us-gaap_LossContingencyDamagesSoughtValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12021-110248 + Details
Name: | us-gaap_LossContingencyEstimateOfPossibleLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
Name: | us-gaap_RegulatoryLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=d_SCANAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_LitigationCaseAxis=d_DESCRatepayerCaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=d_DESCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_CaliforniaFranchiseTaxBoardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=stpr_SC
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=d_VirginiaElectricAndPowerCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EnvironmentalExitCostByPropertyAxis=d_CostOfLandfillsAndBeneficialReuseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EnvironmentalExitCostByPropertyAxis=d_IncreaseInPropertyPlantAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EnvironmentalExitCostByPropertyAxis=d_FutureAshPondAndLandfillClosureCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=d_OtherOperationsAndMaintenanceExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=d_DominionEnergyGasHoldingsLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAgencyAxis=d_FederalEnergyRegulatoryCommissionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LitigationStatusAxis=us-gaap_PendingLitigationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EnvironmentalRemediationContingencyAxis=d_CleanWaterActMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAgencyAxis=d_EnvironmentalProtectionAgencyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=d_FinalRuleToReviseEffluentLimitationsGuidelinesForSteamElectricPowerGeneratingCategoryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=d_TwoThousandFifteenEffluentLimitationsGuidelinesRuleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EnvironmentalRemediationContingencyAxis=d_CoalCombustionResidualMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_UnfavorableRegulatoryActionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EnvironmentalRemediationContingencyAxis=d_UtilityMercuryAndAirToxicsStandardRuleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EnvironmentalRemediationContingencyAxis=d_OzoneStandardsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EnvironmentalRemediationContingencyAxis=d_CoalTarAndOtherPotentiallyHarmfulMaterialsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EnvironmentalRemediationSiteAxis=d_FormerGasPlantSiteWithPostClosureGroundwaterMonitoringProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=d_SCANAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=d_EnvironmentalProtectionAgencyFinalRuleRegulatingManagementOfCoalCombustionResidualMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EnvironmentalRemediationSiteAxis=d_FacilitiesSubjectToCoalCombustionResidualFinalRuleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |