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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: