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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, 2020 | Jun. 30, 2019 | Dec. 31, 2017
Effective Income Tax Computation [Line Items] |  |  |  |
U.S. statutory rate |  | 21.00% | 21.00% | 35.00%
Increases (reductions) resulting from: |  |  |  |
State taxes, net of federal benefit |  | 5.60% | 0.70% |
Investment tax credits |  | 3.90% | (3.80%) |
Production tax credits |  | 0.30% | (1.10%) |
Reversal of excess deferred income taxes |  | 1.50% | (6.90%) |
Write-off of regulatory assets |  | (4.20%) | (41.60%) |
AFUDC - equity |  | 0.50% | (1.90%) |
Other, net |  | 0.90% | (0.30%) |
Effective tax rate |  | 29.50% | (33.90%) |
Virginia Electric and Power Company |  |  |  |
Effective Income Tax Computation [Line Items] |  |  |  |
U.S. statutory rate |  | 21.00% | 21.00% |
Increases (reductions) resulting from: |  |  |  |
State taxes, net of federal benefit |  | 4.90% | 4.70% |
Investment tax credits |  | (11.30%) | (5.20%) |
Production tax credits |  | (2.00%) | (0.80%) |
Reversal of excess deferred income taxes |  | (0.80%) | (4.20%) |
Write-off of regulatory assets |  | 0.00% | 0.00% |
AFUDC - equity |  | (0.60%) | (0.10%) |
Other, net |  | 1.10% | 0.40% |
Effective tax rate |  | 12.30% | 15.80% |
Dominion Energy Gas Holdings, LLC |  |  |  |
Effective Income Tax Computation [Line Items] |  |  |  |
U.S. statutory rate |  | 21.00% | 21.00% |
Increases (reductions) resulting from: |  |  |  |
State taxes, net of federal benefit |  | (255.30%) | 3.00% |
Investment tax credits |  | 0.00% | 0.00% |
Production tax credits |  | 0.00% | 0.00% |
Reversal of excess deferred income taxes |  | (68.40%) | (0.90%) |
Write-off of regulatory assets |  | 189.40% | 0.00% |
AFUDC - equity |  | (36.80%) | (0.50%) |
Other, net | [1] | (467.10%) | (4.30%) |
Effective tax rate |  | (617.20%) | 18.30% |
[1] | Includes (276.0)% and (4.0)% relating to the absence of tax on noncontrolling interest in 2020 and 2019, respectively

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