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Income Taxes (Reconciliation of Income Taxes at the U.S. Statutory Federal Income Tax Rate) (Detail) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | 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 | 0.20% | 3.30% |
Investment tax credits | (5.70%) | (0.90%) |
Production tax credits | (1.20%) | (0.70%) |
Reversal of excess deferred income taxes | (6.80%) | (1.50%) |
Federal legislative change |  | 2.00% |
State legislative change |  | (0.80%) |
Write-off of regulatory assets | 33.50% |  |
AFUDC - equity | (2.00%) | (0.90%) |
Other, net | (2.70%) | (1.00%) |
Effective tax rate | 36.30% | 20.50% |
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 | 4.50% | 4.60% |
Investment tax credits | (5.30%) | (1.40%) |
Production tax credits | (0.80%) | (0.70%) |
Reversal of excess deferred income taxes | (4.10%) | (1.90%) |
Federal legislative change |  | (0.20%) |
AFUDC - equity |  | (0.50%) |
Other, net | (1.20%) | (0.30%) |
Effective tax rate | 14.10% | 20.60% |
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 | 4.20% | 3.90% |
Reversal of excess deferred income taxes | (1.10%) | (1.30%) |
Federal legislative change |  | 2.00% |
State legislative change |  | 0.10% |
AFUDC - equity | (0.60%) | (0.40%) |
Other, net | (1.30%) | 0.70% |
Effective tax rate | 22.20% | 26.00% |

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