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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Effective Income Tax Computation [Line Items] |  |  |  |
U.S. statutory rate | 21.00% | 21.00% | 21.00% | 35.00%
Increases (reductions) resulting from: |  |  |  |
State taxes, net of federal benefit | 2.00% | 1.50% | 4.30% |
Investment tax credits | (9.60%) | (11.40%) | (2.30%) |
Production tax credits | (0.70%) | (2.10%) | (0.80%) |
Valuation allowances | 0.90% | 0.50% | 0.40% |
Reversal of excess deferred income taxes | (5.40%) | (3.20%) | (2.30%) |
Federal legislative change | 0.00% | 0.00% | 1.80% |
State legislative change | 0.00% | 0.00% | (0.80%) |
Write-off of regulatory assets | 0.00% | 21.70% | 0.00% |
Change in tax status | (1.70%) | (5.50%) | 0.00% |
AFUDC—equity | (0.20%) | (0.20%) | (0.30%) |
Changes in state deferred taxes associated with assets held for sale | (3.20%) | 0.00% | 0.00% |
Absence of tax on noncontrolling interest | 3.80% | (0.20%) | (0.10%) |
Employee stock ownership plan deduction | (0.90%) | (1.40%) | (0.50%) |
Nondeductible goodwill | 0.00% | 1.80% | 0.00% |
Other, net | (0.10%) | 1.50% | (0.40%) |
Effective tax rate | 5.90% | 24.00% | 20.00% |
Virginia Electric and Power Company |  |  |  |
Effective Income Tax Computation [Line Items] |  |  |  |
U.S. statutory rate | 21.00% | 21.00% | 21.00% |
Increases (reductions) resulting from: |  |  |  |
State taxes, net of federal benefit | 4.80% | 4.50% | 4.70% |
Investment tax credits | (4.50%) | (2.90%) | (3.50%) |
Production tax credits | (0.70%) | (0.70%) | (0.70%) |
Valuation allowances | 0.00% | 0.00% | 0.00% |
Reversal of excess deferred income taxes | (2.20%) | (3.10%) | (3.20%) |
Federal legislative change | 0.00% | 0.00% | 1.30% |
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% | 0.00% | (0.50%) |
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% | 0.00% |
Employee stock ownership plan deduction | 0.00% | 0.00% |  |
Nondeductible goodwill | 0.00% | 0.00% | 0.00% |
Other, net | (0.10%) | (0.20%) | (0.10%) |
Effective tax rate | 18.30% | 18.60% | 19.00% |

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