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Nature of Operations (Narrative) (Detail) | 12 Months Ended
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Dec. 31, 2018 Segments
Subsidiary, Sale of Stock [Line Items] |  |
Number of operating segments | 3 |
Iroquois |  |
Subsidiary, Sale of Stock [Line Items] |  |
Ownership percentage | 50.00% | [1]
Iroquois | Partnership Interest | Dominion Energy Midstream Partners, LP |  |
Subsidiary, Sale of Stock [Line Items] |  |
Noncontrolling partnership percentage interest | 25.93% |
Common and Subordinated Units | Dominion Energy Midstream Partners, LP |  |
Subsidiary, Sale of Stock [Line Items] |  |
Ownership interest percentage of limited partner interests | 60.90% |
Convertible Preferred Units | Dominion Energy Midstream Partners, LP |  |
Subsidiary, Sale of Stock [Line Items] |  |
Ownership interest percentage of limited partner interests | 37.50% |
Virginia Electric and Power Company |  |
Subsidiary, Sale of Stock [Line Items] |  |
Number of operating segments | 2 |
Dominion Energy Gas Holdings, LLC |  |
Subsidiary, Sale of Stock [Line Items] |  |
Number of operating segments | 1 |
Dominion Energy Gas Holdings, LLC | Iroquois |  |
Subsidiary, Sale of Stock [Line Items] |  |
Ownership percentage | 50.00% |
Dominion Energy Gas Holdings, LLC | White River Hub |  |
Subsidiary, Sale of Stock [Line Items] |  |
Ownership percentage | 50.00% |
[1] | Comprised of Dominion Energy Midstream’s interest of 25.93% and Dominion Energy Gas’ interest of 24.07%. See Note 15 for more information.

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