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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, 2019 | Dec. 31, 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 |  | 1.30% | 3.00% | 2.00%
Investment tax credits |  | (5.70%) | (1.90%) | (6.30%)
Production tax credits |  | (1.10%) | (0.70%) | (0.70%)
Valuation allowances |  | 0.10% | 0.30% | 0.20%
Reversal of excess deferred income taxes |  | (2.00%) | (2.00%) | 0.00%
Federal legislative change |  | 0.00% | 1.50% | (27.50%)
State legislative change |  | 0.00% | (0.60%) | 0.00%
Write-off of regulatory assets |  | 10.90% | 0.00% | 0.00%
Change in tax status |  | (2.80%) | 0.00% | 0.00%
AFUDC-equity |  | (1.80%) | (0.80%) | (1.40%)
Employee stock ownership plan deduction |  | (0.70%) | (0.40%) | (0.60%)
Other, net |  | 1.10% | (0.90%) | (1.70%)
Effective tax rate |  | 20.30% | 18.50% | (1.00%)
Virginia Electric and Power Company |  |  |  |
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 |  | 4.50% | 4.70% | 3.70%
Investment tax credits |  | (2.90%) | (3.50%) | (0.80%)
Production tax credits |  | (0.70%) | (0.70%) | (0.40%)
Valuation allowances |  | 0.00% | 0.00% | 0.00%
Reversal of excess deferred income taxes |  | (3.10%) | (3.20%) | 0.00%
Federal legislative change |  | 0.00% | 1.30% | (4.00%)
State legislative change |  | 0.00% | 0.00% | 0.00%
Write-off of regulatory assets |  | 0.00% | 0.00% | 0.00%
Change in tax status |  | 0.00% | 0.00% | 0.00%
AFUDC-equity |  | 0.00% | (0.50%) | (0.60%)
Employee stock ownership plan deduction |  | 0.00% | 0.00% | 0.00%
Other, net |  | (0.20%) | (0.10%) | 0.60%
Effective tax rate |  | 18.60% | 19.00% | 33.50%
Dominion Energy Gas Holdings, LLC |  |  |  |
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 |  | 2.50% | 3.20% | 2.60%
Investment tax credits |  | 0.00% | 0.00% | 0.00%
Production tax credits |  | 0.00% | 0.00% | 0.00%
Valuation allowances |  | (0.20%) | 0.00% | 0.30%
Reversal of excess deferred income taxes |  | (0.80%) | (0.60%) | 0.00%
Federal legislative change |  | 0.00% | (0.50%) | (41.00%)
State legislative change |  | 0.00% | (2.00%) |
Write-off of regulatory assets |  | 0.00% | 0.00% | 0.00%
Change in tax status |  | (6.00%) | 0.00% | 0.00%
AFUDC-equity |  | (0.50%) | (0.30%) | (0.90%)
Employee stock ownership plan deduction |  | 0.00% | 0.00% | 0.00%
Other, net | [1] | (3.40%) | (4.40%) | (6.00%)
Effective tax rate |  | 12.60% | 16.40% | (10.70%)
[1] | Includes (3.2)%, (4.6)% and (6.7)% relating to the absence of tax on noncontrolling interest in 2019, 2018 and 2017, respectively.

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