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Acquisitions and Dispositions (Dominion Energy Gas Restructuring) (Narrative) (Detail) | Dec. 31, 2019
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Cove Point |
Business Acquisition And Dispositions [Line Items] |
Percentage Of Controlling Ownership | 75.00%
White River Hub |
Business Acquisition And Dispositions [Line Items] |
Minority Interest Ownership Percentage By Parent | 50.00%
Iroquois |
Business Acquisition And Dispositions [Line Items] |
Minority Interest Ownership Percentage By Parent | 25.93%
Cove Point |
Business Acquisition And Dispositions [Line Items] |
Minority Interest Ownership Percentage By Parent | 25.00%

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