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Income Taxes (Reconciliation of Income Taxes at the U.S. Statutory Federal Income Tax Rate) (Detail) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Effective Income Tax Computation [Line Items] |  |  |
U.S. statutory rate | 21.00% | 35.00% | 35.00%
Increases (reductions) resulting from: |  |  |
State taxes, net of federal benefit | 3.80% | 2.80% |
Investment tax credits | (0.90%) | (5.50%) |
Production tax credits | (0.70%) | (0.80%) |
Reversal of excess deferred income taxes | (1.50%) |  |
State legislative change | (1.60%) |  |
AFUDC - equity | (1.00%) | (1.40%) |
Other, net | (1.00%) | (2.60%) |
Effective tax rate | 18.10% | 27.50% |
Virginia Electric and Power Company |  |  |
Effective Income Tax Computation [Line Items] |  |  |
U.S. statutory rate | 21.00% | 35.00% |
Increases (reductions) resulting from: |  |  |
State taxes, net of federal benefit | 4.50% | 3.70% |
Investment tax credits | (1.40%) | (0.80%) |
Production tax credits | (0.70%) | (0.50%) |
Reversal of excess deferred income taxes | (2.00%) |  |
AFUDC - equity | (0.50%) | (0.60%) |
Other, net | 0.30% | (0.10%) |
Effective tax rate | 21.20% | 36.70% |
Dominion Energy Gas Holdings, LLC |  |  |
Effective Income Tax Computation [Line Items] |  |  |
U.S. statutory rate | 21.00% | 35.00% |
Increases (reductions) resulting from: |  |  |
State taxes, net of federal benefit | 3.60% | 1.50% |
Reversal of excess deferred income taxes | (1.20%) |  |
State legislative change | 0.30% |  |
AFUDC - equity | (0.40%) | (1.00%) |
Other, net | 0.20% |  |
Effective tax rate | 23.50% | 35.50% |

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