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v3.23.1

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, 2023 | Mar. 31, 2022
Effective Income Tax Computation [Line Items] |  |
U.S. statutory rate | 21.00% | 21.00%
Increases (reductions) resulting from: |  |
Recognition of taxes - sale of subsidiary stock | 0.00% | 9.40%
State taxes, net of federal benefit | 3.40% | 3.30%
Investment tax credits | (2.30%) | (3.90%)
Production tax credits | (0.40%) | (0.40%)
Reversal of excess deferred income taxes | (2.70%) | (4.10%)
Changes in state deferred taxes associated with assets held for sale | 0.00% | 0.50%
AFUDC - equity | (0.10%) | (0.60%)
Other, net | (0.80%) | 0.20%
Effective tax rate | 18.10% | 25.40%
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 | 4.60% | 4.40%
Investment tax credits | (0.30%) | (6.70%)
Production tax credits | (0.70%) | (0.80%)
Reversal of excess deferred income taxes | (2.70%) | (3.00%)
AFUDC - equity | 0.20% | (0.90%)
Other, net | (0.20%) | 0.60%
Effective tax rate | 21.90% | 14.60%

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + 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 applicable to state and local income tax expense (benefit), net of federal tax expense (benefit). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI https://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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