Income Taxes (Reconciliation of Income Taxes at the U.S. Statutory Federal Income Tax Rate) (Detail)	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2017
Effective Income Tax Computation [Line Items]
U.S. statutory rate	21.00%	21.00%	21.00%	35.00%
Increases (reductions) resulting from:
State taxes, net of federal benefit	2.60%	2.00%	1.50%
Investment tax credits	(3.20%)	(9.60%)	(11.40%)
Production tax credits	(0.40%)	(0.70%)	(2.10%)
Valuation allowances	0.10%	0.90%	0.50%
Reversal of excess deferred income taxes	(3.20%)	(5.40%)	(3.20%)
State legislative change	(0.70%)	0.00%	0.00%
Write-off of regulatory assets	0.00%	0.00%	21.70%
Change in tax status	0.00%	(1.70%)	(5.50%)
AFUDC—equity	(0.40%)	(0.20%)	(0.20%)
Changes in state deferred taxes associated with assets held for sale	(0.30%)	(3.20%)	0.00%
Absence of tax on noncontrolling interest	(0.10%)	3.80%	(0.20%)
Settlements of uncertain tax positions	(1.20%)	0.00%	0.00%
Employee stock ownership plan deduction	(0.30%)	(0.90%)	(1.40%)
Nondeductible goodwill	0.00%	0.00%	1.80%
Other, net	(0.20%)	(0.10%)	1.50%
Effective tax rate	13.70%	5.90%	24.00%
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:
State taxes, net of federal benefit	4.60%	4.80%	4.50%
Investment tax credits	(3.00%)	(4.50%)	(2.90%)
Production tax credits	(0.60%)	(0.70%)	(0.70%)
Valuation allowances	0.00%	0.00%	0.00%
Reversal of excess deferred income taxes	(2.10%)	(2.20%)	(3.10%)
State legislative change	(0.70%)	0.00%	0.00%
Write-off of regulatory assets	0.00%	0.00%	0.00%
Change in tax status	0.00%	0.00%	0.00%
AFUDC—equity	(0.50%)	0.00%	0.00%
Changes in state deferred taxes associated with assets held for sale	0.00%	0.00%	0.00%
Absence of tax on noncontrolling interest	0.00%	0.00%	0.00%
Settlements of uncertain tax positions	0.00%	0.00%	0.00%
Employee stock ownership plan deduction	0.00%	0.00%	0.00%
Nondeductible goodwill	0.00%	0.00%	0.00%
Other, net	0.10%	(0.10%)	(0.20%)
Effective tax rate	18.80%	18.30%	18.60%

Effective income tax computation.

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- Definition

Effective income tax rate reconciliation allowance for funds used during construction equity.

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

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- Definition

Effective income tax rate reconciliation change in state legislation percent.

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Effective income tax rate reconciliation change in tax status.

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- Definition

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

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- Definition

Effective income tax rate reconciliation settlements of uncertain tax positions.

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- Definition

Effective Income Tax Rate Reconciliation Write Off Of Regulatory Assets

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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 http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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-Name Accounting Standards Codification
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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 changes in the valuation allowance for deferred tax assets.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
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-Section 50
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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 deduction for dividend paid to employee stock ownership plan.

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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 noncontrolling interest income (loss) exempt from income taxes.

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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 applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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