XML 111 R94.htm IDEA: XBRL DOCUMENT
v3.19.1

Regulatory Matters - Summary of Additional Virginia Power Electric Transmission Projects Approved and Applied (Detail) - Virginia Electric and Power Company - Virginia Regulation $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 USD ($) kV mi
Partial Rebuild of Overhead Transmission Lines in Alleghany County, Virginia and Covington, Virginia |
Public Utilities General Disclosures [Line Items] |
Application Date | 2018-08
Approval Date | 2019-04
Type of Line | kV | 138
Miles of Lines | mi | 5
Cost Estimate (millions) | $ | $ 15
Rebuild and Operate Between Lanexa and Northern Neck in Virginia |
Public Utilities General Disclosures [Line Items] |
Application Date | 2018-06
Approval Date | 2019-02
Type of Line | kV | 230
Miles of Lines | mi | 3
Cost Estimate (millions) | $ | $ 30
Rebuild and Operate Glebe Substation and Relocate and Operate in Arlington County, Virginia and City of Alexandria, Virginia Existing Overhead Line Underground |
Public Utilities General Disclosures [Line Items] |
Application Date | 2019-03
Type of Line | kV | 230
Cost Estimate (millions) | $ | $ 125
Rebuild and Operate Glebe Substation and Relocate and Operate in Arlington County, Virginia and City of Alexandria, Virginia Existing Overhead Line Underground | Maximum [Member] |
Public Utilities General Disclosures [Line Items] |
Miles of Lines | mi | 1
Rebuild and Operate Between Valley, Virginia and Mt. Storm, West Virginia |
Public Utilities General Disclosures [Line Items] |
Application Date | 2019-04
Type of Line | kV | 500
Miles of Lines | mi | 65
Cost Estimate (millions) | $ | $ 290

X
- Definition Application date of public utilities transmission. + References No definition available. + Details
Name: | d_ApplicationDateOfPublicUtilitiesTransmission
Namespace Prefix: | d_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

X
- Definition Approval date of public utilities transmission. + References No definition available. + Details
Name: | d_ApprovalDateOfPublicUtilitiesTransmission
Namespace Prefix: | d_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

X
- Definition Kilo Volt Line + References No definition available. + Details
Name: | d_KiloVoltLine
Namespace Prefix: | d_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public utilities, length of transmission line. + References No definition available. + Details
Name: | d_PublicUtilitiesLengthOfTransmissionLine
Namespace Prefix: | d_
Data Type: | num:lengthItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public utilities, property, plant and equipment, expected cost of construction. + References No definition available. + Details
Name: | d_PublicUtilitiesPropertyPlantAndEquipmentExpectedCostOfConstruction
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_PublicUtilitiesGeneralDisclosuresLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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

X
- Details
Name: | us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=d_TransmissionLineInAlleghanyCountryVirginiaAndCovingtonVirginiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=d_TransmissionLinesBetweenLanexaAndNorthernNeckInVirginiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=d_TransmissionLinesBetweenGlebeSubstationAndArlingtonCountryVirginiaAndCityOfAlexandriaVirginiaExistingOverheadLineUndergroundMember
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_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=d_TransmissionLinesBetweenValleyVirginiaAndMtStormWestVirginiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |