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Income Taxes (Reconciliation of Income Taxes at the U.S. Statutory Federal Income Tax Rate) (Detail) | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 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 | 3.40% | 3.80%
Investment tax credits | (1.30%) | (1.10%)
Production tax credits | (1.00%) | (0.40%)
Reversal of excess deferred income taxes | (2.10%) | (2.00%)
AFUDC - equity | (0.70%) | (0.10%)
Other, net | 0.10% | (1.10%)
Effective tax rate | 19.40% | 20.10%
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 | (0.70%) | (0.80%)
Production tax credits | (0.90%) | (0.70%)
Reversal of excess deferred income taxes | (1.70%) | (2.70%)
AFUDC - equity | (0.70%) | 0.20%
Other, net | 0.20% | (0.20%)
Effective tax rate | 21.60% | 21.40%

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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 + Details
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479360/740-10-S99-1 + Details
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