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v3.20.2

Income Taxes (Reconciliation of Income Taxes at the U.S. Statutory Federal Income Tax Rate) (Detail) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 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 | 1.50% | (898.50%) |
Investment tax credits | (30.50%) | (325.20%) |
Production tax credits | (2.40%) | (66.30%) |
Reversal of excess deferred income taxes | (14.50%) | (375.60%) |
Write-off of regulatory assets | 0.00% | 16565.90% |
Change in tax status | (6.10%) | 0.00% |
AFUDC - equity | (1.10%) | (55.80%) |
Changes in state deferred taxes associated with assets held for sale | (11.60%) | 0.00% |
Absence of tax on noncontrolling interest | 14.10% | 0.00% |
Other, net | (1.80%) | (987.30%) |
Effective tax rate | (31.40%) | 13878.20% |
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 | 4.70% | 4.50% |
Investment tax credits | (5.60%) | (5.30%) |
Production tax credits | (0.90%) | (0.80%) |
Reversal of excess deferred income taxes | (1.90%) | (4.10%) |
Write-off of regulatory assets | 0.00% | 0.00% |
Change in tax status | 0.00% | 0.00% |
AFUDC - equity | (0.30%) | 0.00% |
Changes in state deferred taxes associated with assets held for sale | 0.00% | 0.00% |
Absence of tax on noncontrolling interest | 0.00% | 0.00% |
Other, net | 0.00% | (1.20%) |
Effective tax rate | 17.00% | 14.10% |

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