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Commitments and Contingencies (Nuclear Operations) (Narrative) (Detail) - Kewaunee $ in Millions | Mar. 31, 2018 USD ($)
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Loss Contingencies [Line Items] |
Liability coverage | $ 100
Property insurance limit | $ 50

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- Definition Liability coverage limit. + References No definition available. + Details
Name: | d_LiabilityCoverageLimit
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Property insurance limit. + References No definition available. + Details
Name: | d_PropertyInsuranceLimit
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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

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