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Income Taxes (Reconciliation of Income Taxes at the U.S. Statutory Federal Income Tax Rate) (Parenthetical) (Detail) | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Effective Income Tax Computation [Line Items] |  |  |
Effective income tax rate reconcilation other adjustments |  | (2.20%) | (2.00%)
Dominion Energy Gas Holdings, LLC |  |  |
Effective Income Tax Computation [Line Items] |  |  |
Effective income tax rate reconcilation other adjustments | [1] | (4.80%) | (4.70%)
Noncontrolling Interest | Dominion Energy Gas Holdings, LLC |  |  |
Effective Income Tax Computation [Line Items] |  |  |
Effective income tax rate reconcilation other adjustments |  | (4.00%) | (4.90%)
[1] | Includes (4.0)% and (4.9)% relating to the absence of tax on noncontrolling interest in 2019 and 2018, respectively.

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- Definition Effective income tax computation. + References No definition available. + Details
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