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Income Taxes (Earliest Tax Year) (Detail) | 12 Months Ended
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Dec. 31, 2017
Pennsylvania |  |
Operation In Major Geographical Areas Tax Year [Line Items] |  |
Earliest Open Tax Year | 2012 | [1]
Connecticut |  |
Operation In Major Geographical Areas Tax Year [Line Items] |  |
Earliest Open Tax Year | 2014 |
Virginia |  |
Operation In Major Geographical Areas Tax Year [Line Items] |  |
Earliest Open Tax Year | 2014 | [2]
West Virginia |  |
Operation In Major Geographical Areas Tax Year [Line Items] |  |
Earliest Open Tax Year | 2014 | [1]
New York |  |
Operation In Major Geographical Areas Tax Year [Line Items] |  |
Earliest Open Tax Year | 2011 | [1]
Utah |  |
Operation In Major Geographical Areas Tax Year [Line Items] |  |
Earliest Open Tax Year | 2014 |
[1] | Considered a major state for Dominion Energy Gas' operations.
[2] | Considered a major state for Virginia Power's operations.

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