XML 134 R179.htm IDEA: XBRL DOCUMENT
v3.19.3

Commitments and Contingencies (Nuclear Operations) (Narrative) (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2015 | Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Loss Contingencies [Line Items] |  |  |  |  |  |  |
NRC minimum requirement for nuclear power plant licensees |  | $ 1,060,000,000.00 |  |  | $ 1,060,000,000.00 |  |
Maximum assessment for premiums on insurance policy | $ 50,000,000 |  |  |  | 83,000,000 |  |
Maximum assessment for insurance policy |  |  |  |  | 21,000,000 |  |
Spent Nuclear Fuel |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Receivables |  | 49,000,000 |  |  | 49,000,000 | $ 46,000,000 |
Maximum |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Amount that could be assessed for each licensed reactor |  | 138,000,000 |  |  | 138,000,000 |  |
Amount that could be assessed for each licensed reactor per reactor |  | 21,000,000 |  |  | $ 21,000,000 |  |
Nuclear Obligations |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Maximum liability protection per nuclear incident amount |  | 14,100,000,000 | $ 13,100,000,000 | $ 13,400,000,000 |  |  |
Inflationary provision adjustment period |  |  |  |  | 5 years |  |
Virginia Electric and Power Company |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Maximum assessment for premiums on insurance policy |  |  |  |  | $ 51,000,000 |  |
Maximum assessment for insurance policy |  |  |  |  | 10,000,000 |  |
Virginia Electric and Power Company | Spent Nuclear Fuel |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Receivables |  | 30,000,000 |  |  | 30,000,000 | 30,000,000 |
Dominion Energy and Virginia Electric and Power |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Amount of coverage purchased from commercial insurance pools |  | 450,000,000 |  |  | 450,000,000 |  |
Surry and North Anna |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Settlement amount |  |  |  |  | 16,000,000 | 22,000,000 | $ 30,000,000
Millstone |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Settlement amount |  |  |  |  | 13,000,000 | $ 14,000,000 | $ 22,000,000
Millstone Unit 1 |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Minimum financial assurance |  | 2,700,000,000 |  |  | 2,700,000,000 |  |
Kewaunee | Nuclear Obligations |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Maximum liability protection per nuclear incident amount |  |  |  |  | 100,000,000 |  |
Kewaunee | Virginia Electric and Power Company |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Minimum financial assurance |  | $ 1,800,000,000 |  |  | $ 1,800,000,000 |  |

X
- Definition Estimated insurance recoveries per year per reactor. + References No definition available. + Details
Name: | d_EstimatedInsuranceRecoveriesPerYearPerReactor
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Inflationary provision adjustment period. + References No definition available. + Details
Name: | d_InflationaryProvisionAdjustmentPeriod
Namespace Prefix: | d_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum liability protection per nuclear incident amount. + References No definition available. + Details
Name: | d_MaximumLiabilityProtectionPerNuclearIncidentAmount
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Maximum retrospective premium assessment for nuclear power plant licensees. + References No definition available. + Details
Name: | d_MaximumRetrospectivePremiumAssessmentForNuclearPowerPlantLicensees
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Maximum retrospective premium assessment for replacement power costs. + References No definition available. + Details
Name: | d_MaximumRetrospectivePremiumAssessmentForReplacementPowerCosts
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Minimum Nuclear Insurance Required Per Site + References No definition available. + Details
Name: | d_MinimumNuclearInsuranceRequiredPerSite
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Receivables for spent nuclear fuel related costs. + References No definition available. + Details
Name: | d_ReceivablesForSpentNuclearFuelRelatedCosts
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Carrying amount as of the balance sheet date of amounts expected to be recovered under the terms of insurance contracts. + 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 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_EstimatedInsuranceRecoveries
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount awarded from other party in judgment or settlement of litigation. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementAmountAwardedFromOtherParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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 Amount of asset related to consideration paid in advance for insurance that provides economic benefits within a future period of one year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 10 -Section 05 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68074540&loc=d3e5865-108316 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6787-107765 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 10 -Section 05 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=68074540&loc=d3e5879-108316 + Details
Name: | us-gaap_PrepaidInsurance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of an asset, typically cash, provided to a counterparty to provide certain assurance of performance by the entity pursuant to the terms of a written or oral agreement, such as a lease. + 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 210.5-02.8,17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_SecurityDeposit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=d_SpentNuclearFuelMember
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: | us-gaap_PublicUtilityAxis=us-gaap_NuclearPlantMember
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: | dei_LegalEntityAxis=d_DominionEnergyAndVirginiaElectricAndPowerCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | us-gaap_EnvironmentalExitCostByPropertyAxis=d_MillstoneUnit1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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