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Acquisitions and Dispositions (Schedule of Acquisitions of Solar Projects) (Parenthetical) (Detail) | 1 Months Ended
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Apr. 30, 2017 MW
Business Combinations Discontinued Operations And Disposal Groups [Abstract] |
Discontinued efforts on acquisition of additional MW capacity | 20

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- Definition Additional capacity of facility of company owned solar distribution generation facilities in which acquisition efforts were discontinued. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Business combinations, discontinued operations and disposal groups. + References No definition available. + Details
Name: | d_BusinessCombinationsDiscontinuedOperationsAndDisposalGroupsAbstract
Namespace Prefix: | d_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration