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Acquisitions and Dispositions (Dominion Energy Gas Restructuring) (Narrative) (Detail) | Sep. 30, 2019
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Cove Point, DECG And Dominion Energy Questar Pipeline [Member] |
Business Acquisition And Dispositions [Line Items] |
Percentage Of Controlling Ownership | 75.00%
White River Hub [Member] |
Business Acquisition And Dispositions [Line Items] |
Minority Interest Ownership Percentage By Parent | 50.00%
Iroquois [Member] |
Business Acquisition And Dispositions [Line Items] |
Minority Interest Ownership Percentage By Parent | 25.93%
Cove Point [Member] |
Business Acquisition And Dispositions [Line Items] |
Minority Interest Ownership Percentage By Noncontrolling Owners | 25.00%

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