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Income Taxes (Reconciliation of Income Taxes at the U.S. Statutory Federal Income Tax Rate) (Detail) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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 |  | 3.00% | 2.00% | 2.40%
Investment tax credits |  | (1.90%) | (6.30%) | (11.70%)
Production tax credits |  | (0.70%) | (0.70%) | (0.80%)
Valuation allowances |  | 0.30% | 0.20% | 1.20%
Reversal of excess deferred income taxes |  | (2.00%) |  |
Federal legislative change |  | 1.50% | (27.50%) |
State legislative change |  | (0.60%) |  | (0.60%)
AFUDC-equity |  | (0.80%) | (1.40%) | (0.60%)
Employee stock ownership plan deduction |  | (0.40%) | (0.60%) | (0.60%)
Other, net |  | (0.90%) | (1.70%) | (1.40%)
Effective tax rate |  | 18.50% | (1.00%) | 22.90%
Virginia Electric and Power Company |  |  |  |
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 |  | 4.70% | 3.70% | 3.80%
Investment tax credits |  | (3.50%) | (0.80%) |
Production tax credits |  | (0.70%) | (0.40%) | (0.50%)
Valuation allowances |  |  |  | 0.10%
Reversal of excess deferred income taxes |  | (3.20%) |  |
Federal legislative change |  | 1.30% | (4.00%) |
AFUDC-equity |  | (0.50%) | (0.60%) | (0.60%)
Other, net |  | (0.10%) | 0.60% | (0.40%)
Effective tax rate |  | 19.00% | 33.50% | 37.40%
Dominion Energy Gas Holdings, LLC |  |  |  |
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 |  | 3.20% | 2.60% | 2.00%
Valuation allowances |  | 0.00% | 0.30% |
Reversal of excess deferred income taxes |  | (0.60%) |  |
Federal legislative change |  | (0.50%) | (41.00%) |
State legislative change |  | (2.00%) | (0.70%) |
AFUDC-equity |  | (0.30%) | (0.90%) | (0.20%)
Other, net | [1] | (4.40%) | (6.00%) | (5.20%)
Effective tax rate |  | 16.40% | (10.70%) | 31.60%
[1] | Includes (4.6)%, (6.7)% and (6.0)% relating to the absence of tax on noncontrolling interest in 2018, 2017 and 2016, respectively.

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