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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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 | (74.70%) | 0.00% | 0.00%
Recognition of taxes - privatization intercompany gain | 0.00% | 0.00% | 0.00%
State taxes, net of federal benefit | (28.30%) | 1.80% | (0.40%)
Investment tax credits | 108.90% | (4.50%) | (18.60%)
Production tax credits | 12.00% | (0.60%) | (1.30%)
Valuation allowances | 0.00% | 0.20% | 1.70%
Reversal of excess deferred income taxes | 67.30% | (2.80%) | (5.90%)
State legislative change | 0.30% | (1.00%) | 0.00%
Change in tax status | 0.00% | 0.00% | (3.30%)
AFUDC - equity | 5.00% | (0.50%) | (0.10%)
Changes in state deferred taxes associated with assets held for sale | (4.10%) | 0.00% | (6.30%)
Absence of tax on noncontrolling interest | 0.00% | (0.20%) | 7.40%
Settlements of uncertain tax positions | 0.00% | (1.70%) | 0.00%
Employee stock ownership plan deduction | 6.80% | (0.40%) | (1.70%)
Other, net | 5.70% | (0.40%) | (0.70%)
Effective tax rate | 119.90% | 10.90% | (8.20%)
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 | 2.40% | 0.00% | 0.00%
State taxes, net of federal benefit | 4.60% | 4.60% | 4.80%
Investment tax credits | (9.10%) | (3.00%) | (4.50%)
Production tax credits | (1.00%) | (0.60%) | (0.70%)
Valuation allowances | 0.00% | 0.00% | 0.00%
Reversal of excess deferred income taxes | (3.80%) | (2.10%) | (2.20%)
State legislative change | 0.00% | (0.70%) | 0.00%
Change in tax status | 0.00% | 0.00% | 0.00%
AFUDC - equity | (0.40%) | (0.50%) | 0.00%
Settlements of uncertain tax positions | 0.00% | 0.00% | 0.00%
Other, net | (0.10%) | 0.10% | (0.10%)
Effective tax rate | 13.60% | 18.80% | 18.30%

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