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Income Taxes (Reconciliation of Income Taxes at the U.S. Statutory Federal Income Tax Rate) (Detail) | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023
Effective Income Tax Computation [Line Items] |  |
U.S. statutory rate | 21.00% | 21.00%
Increases (reductions) resulting from: |  |
State taxes, net of federal benefit | 3.30% | 3.90%
Investment tax credits | (1.20%) | (1.50%)
Production tax credits | (2.80%) | (0.60%)
Reversal of excess deferred income taxes | (2.40%) | (2.60%)
Changes in state deferred taxes associated with assets held for sale | 0.00% | 1.30%
AFUDC - equity | (0.60%) | (0.10%)
Other, net | (0.40%) | (0.80%)
Effective tax rate | 16.90% | 20.60%
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 | 4.40% | 4.60%
Investment tax credits | (0.80%) | (0.70%)
Production tax credits | (3.00%) | (0.90%)
Reversal of excess deferred income taxes | (1.80%) | (2.60%)
Changes in state deferred taxes associated with assets held for sale | 0.00% | 0.00%
AFUDC - equity | (0.60%) | 0.00%
Other, net | 0.30% | (0.30%)
Effective tax rate | 19.50% | 21.10%

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 + Details
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