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Income Taxes (Reconciliation of Income Taxes at the U.S. Statutory Federal Income Tax Rate) (Detail)		6 Months Ended		12 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2017
Effective Income Tax Computation [Line Items]
U.S. statutory rate		21.00%	21.00%	35.00%
Increases (reductions) resulting from:
State taxes, net of federal benefit		5.60%	0.70%
Investment tax credits		3.90%	(3.80%)
Production tax credits		0.30%	(1.10%)
Reversal of excess deferred income taxes		1.50%	(6.90%)
Write-off of regulatory assets		(4.20%)	(41.60%)
AFUDC - equity		0.50%	(1.90%)
Other, net		0.90%	(0.30%)
Effective tax rate		29.50%	(33.90%)
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		4.90%	4.70%
Investment tax credits		(11.30%)	(5.20%)
Production tax credits		(2.00%)	(0.80%)
Reversal of excess deferred income taxes		(0.80%)	(4.20%)
Write-off of regulatory assets		0.00%	0.00%
AFUDC - equity		(0.60%)	(0.10%)
Other, net		1.10%	0.40%
Effective tax rate		12.30%	15.80%
Dominion Energy Gas Holdings, LLC
Effective Income Tax Computation [Line Items]
U.S. statutory rate		21.00%	21.00%
Increases (reductions) resulting from:
State taxes, net of federal benefit		(255.30%)	3.00%
Investment tax credits		0.00%	0.00%
Production tax credits		0.00%	0.00%
Reversal of excess deferred income taxes		(68.40%)	(0.90%)
Write-off of regulatory assets		189.40%	0.00%
AFUDC - equity		(36.80%)	(0.50%)
Other, net	[1]	(467.10%)	(4.30%)
Effective tax rate		(617.20%)	18.30%
[1] Includes (276.0)% and (4.0)% relating to the absence of tax on noncontrolling interest in 2020 and 2019, respectively

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Effective income tax computation.

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

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