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Income Taxes (Reconciliation of Income Taxes at the U.S. Statutory Federal Income Tax Rate) (Detail)	6 Months Ended
	Jun. 30, 2023	Jun. 30, 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%	25.00%
State taxes, net of federal benefit	3.30%	7.90%
Investment tax credits	(2.60%)	(9.80%)
Production tax credits	(0.40%)	(1.10%)
Reversal of excess deferred income taxes	(2.60%)	(10.20%)
Changes in state deferred taxes associated with assets held for sale	0.00%	1.40%
AFUDC - equity	(0.10%)	(1.30%)
Other, net	(0.90%)	0.20%
Effective tax rate	17.70%	33.10%
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	4.60%	4.40%
Investment tax credits	(0.30%)	(6.90%)
Production tax credits	(0.80%)	(1.00%)
Reversal of excess deferred income taxes	(2.30%)	(3.90%)
AFUDC - equity	(0.10%)	(1.00%)
Other, net	(0.50%)	0.60%
Effective tax rate	21.60%	13.20%

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- Definition

Effective income tax computation.

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Effective income tax rate reconciliation change in state deferred taxes associated with assets held for sale.

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Effective income tax rate reconciliation recognition of taxes sale of subsidiary stock.

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Effective income tax rate reconciliation reversal of excess deferred income taxes.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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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.

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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 investment tax credit.

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