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Acquisitions and Dispositions (Results of Operations and Pro Forma Information) (Narrative) (Detail) - Dominion Energy Questar Corporation $ in Millions | 3 Months Ended
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Mar. 31, 2019 USD ($)
Business Acquisition [Line Items] |
Increase in operating revenue | $ 170
Decrease in net income | 1,100
Other operations and maintenance |
Business Acquisition [Line Items] |
Merger and integration related costs | 115
Interest and related charges |
Business Acquisition [Line Items] |
Merger and integration related costs | $ 9

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