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Income Taxes (Reconciliation of Income Taxes at the U.S. Statutory Federal Income Tax Rate) (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Effective Income Tax Computation [Line Items] |  |  |
U.S. statutory rate | 21.00% | 21.00% | 21.00%
Increases (reductions) resulting from: |  |  |
Recognition of taxes - sale of subsidiary stock | 0.00% | 0.00% | 28.00%
State taxes, net of federal benefit | 3.60% | 3.90% | 15.90%
Investment tax credits | (1.60%) | (1.00%) | (12.60%)
Production tax credits | (4.80%) | (0.60%) | (4.50%)
Reversal of excess deferred income taxes | (3.10%) | (2.60%) | (25.20%)
State legislative change | 0.00% | (0.10%) | (0.10%)
AFUDC - equity | (0.80%) | 0.00% | (1.90%)
Changes in state deferred taxes associated with assets held for sale | 0.00% | 1.10% | 0.90%
Settlements of uncertain tax positions | (0.70%) | (0.40%) | 0.00%
Employee stock ownership plan deduction | (0.30%) | (0.30%) | (2.50%)
Other, net | 0.80% | (0.10%) | (0.90%)
Effective tax rate | 14.10% | 20.90% | 18.10%
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: |  |  |
Recognition of taxes - privatization intercompany gain | 0.00% | 0.00% | 2.40%
State taxes, net of federal benefit | 4.50% | 4.70% | 4.60%
Investment tax credits | (0.90%) | (0.80%) | (2.00%)
Production tax credits | (4.50%) | (0.80%) | (1.00%)
Reversal of excess deferred income taxes | (2.00%) | (2.60%) | (3.80%)
State legislative change | 0.00% | 0.00% | 0.00%
AFUDC - equity | (0.70%) | 0.00% | (0.40%)
Settlements of uncertain tax positions | 0.00% | 0.00% | 0.00%
Other, net | 0.60% | (0.40%) | 0.10%
Effective tax rate | 18.00% | 21.10% | 20.90%

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