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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 | 8.70% | 0.00% | 0.00%
Recognition of taxes - privatization intercompany gain | 0.00% | 0.00% | 0.00%
State taxes, net of federal benefit | 3.90% | 2.60% | 2.00%
Investment tax credits | (12.70%) | (3.20%) | (9.60%)
Production tax credits | (1.40%) | (0.40%) | (0.70%)
Valuation allowances | 0.00% | 0.10% | 0.90%
Reversal of excess deferred income taxes | (11.50%) | (3.20%) | (5.40%)
State legislative change | (0.20%) | (0.70%) | 0.00%
Change in tax status | 0.00% | 0.00% | (1.70%)
AFUDC - equity | (0.70%) | (0.40%) | (0.20%)
Changes in state deferred taxes associated with assets held for sale | 0.50% | (0.30%) | (3.20%)
Absence of tax on noncontrolling interest | 0.00% | (0.10%) | 3.80%
Settlements of uncertain tax positions | 0.00% | (1.20%) | 0.00%
Employee stock ownership plan deduction | (0.80%) | (0.30%) | (0.90%)
Other, net | (0.30%) | (0.20%) | (0.10%)
Effective tax rate | 6.50% | 13.70% | 5.90%
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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