XML 191 R169.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Commitments and Contingencies (Nuclear Insurance) (Parenthetical) (Detail) $ in Millions | Dec. 31, 2018 USD ($)
--- | ---
Surry and North Anna |
Guarantor Obligations [Line Items] |
Coverage amount | $ 200

X
- Definition Property And Casualty Insurance Blanket Property Limit + References No definition available. + Details
Name: | d_PropertyAndCasualtyInsuranceBlanketPropertyLimit
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_GuaranteeObligationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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