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Benefit from revision of environmental remediation expense.

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Business combination acquisition related costs net of tax.

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Charge for property, plant and equipment acquired but committed to forgo recovery.

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Charge for property, plant and equipment acquired but committed to forgo recovery, after tax.

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Variable interest entities payments for contract termination.

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Variable interest entities payments for contract termination after tax.

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Voluntary retirement program expenses.

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Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Amount of liability for consideration received or receivable from customer which is not included in transaction price, when consideration is expected to be refunded to customer, classified as current.

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Amount of deferred tax liability attributable to taxable temporary differences from regulatory assets.

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The adjustment to expense previously capitalized costs of drilling exploratory wells when proved reserves are not found or when the entity obtains information that raises substantial doubt about the economic or operational viability of the project.

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Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees.

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The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).

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Amount before tax, after reclassification adjustments of other comprehensive income (loss).

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Amount of income tax expense (benefit) for remeasurement of deferred tax from change in tax rate pursuant to Tax Cuts and Jobs Act.

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Operating Segments - Dominion Energy (Narrative) (Detail) - USD ($) $ in Millions	1 Months Ended		3 Months Ended		6 Months Ended
	Dec. 31, 2019	May 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2019
Segment Reporting Information [Line Items]
Asset early retirement expense			$ 89.0
Gain loss on investments held in nuclear decommissioning trust funds, after tax			38.0	$ 48.0	$ (187.0)	$ 17.0
Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Charge related to a voluntary retirement program						192.0
Charge related to a voluntary retirement program, after-tax						143.0
Cancellation abandonment expense						62.0
Cancellation abandonment expense, after tax						46.0
Asset early retirement expense after tax						275.0
Gain loss on investments held in nuclear decommissioning trust funds, after tax			$ 5.0	(9.0)	(41.0)	(14.0)
Benefit from revision of future closure costs						113.0
Benefit from revision of future closure costs, after tax						84.0
Variable Interest Entity (VIE) or Potential VIE, Information Unavailability \| Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Payment for contract termination		$ 135.0		135.0		135.0
Payment for contract termination after tax				100.0		100.0
SCANA
Segment Reporting Information [Line Items]
Merger and integration-related costs						446.0
Merger and integration-related costs, after tax						339.0
Charge related to a voluntary retirement program						425.0
Charge related to a voluntary retirement program, after-tax						317.0
Litigation settlement expense	$ 192.5
Operating Segments
Segment Reporting Information [Line Items]
After- tax net expenses					2,900.0	1,800.0
Gain loss on investments held in nuclear decommissioning trust funds					145.0	336.0
Gain loss on investments held in nuclear decommissioning trust funds, after tax					115.0	251.0
Operating Segments \| Virginia Electric and Power Company
Segment Reporting Information [Line Items]
After- tax net expenses					654.0	607.0
Asset early retirement expense after tax					559.0
Corporate and Other \| Operating Segments
Segment Reporting Information [Line Items]
After- tax net expenses					3,100.0	2,100.0
Corporate and Other \| Operating Segments \| Virginia Electric and Power Company
Segment Reporting Information [Line Items]
After- tax net expenses					654.0	652.0
Dominion Energy South Carolina Inc \| SCANA
Segment Reporting Information [Line Items]
Charge for refund of amounts from customers				1,000.0		1,000.0	$ 1,000.0
Charge for refund of amounts from customers, after tax						756.0
Charge related to a voluntary retirement program, after-tax						64.0
Litigation settlement expense						278.0
Litigation settlement expense, after tax						209.0
Charge for property, plant and equipment acquired but committed to forgo recovery						114.0
Charge for property, plant and equipment acquired but committed to forgo recovery, after tax						86.0
Dominion Energy South Carolina Inc \| SCANA \| NND Project
Segment Reporting Information [Line Items]
Tax benefit resulting from re-measurement of deferred income taxes as a result of the 2017 Tax Reform Act						198.0
Income tax related to regulatory assets acquired				$ 264.0		264.0
Dominion Energy Virginia \| Virginia Legislation
Segment Reporting Information [Line Items]
Benefit from revision of future closure costs						113.0
Benefit from revision of future closure costs, after tax						84.0
Dominion Energy Virginia \| Automated Meter Reading Program
Segment Reporting Information [Line Items]
Asset early retirement expense						160.0
Asset early retirement expense after tax						119.0
Dominion Energy Virginia \| SCANA
Segment Reporting Information [Line Items]
Charge related to a voluntary retirement program, after-tax						145.0
Dominion Energy Virginia \| Operating Segments
Segment Reporting Information [Line Items]
Gain loss on investments held in nuclear decommissioning trust funds, after tax					15.0	29.0
Dominion Energy Virginia \| Operating Segments \| Electric Generation Facilities
Segment Reporting Information [Line Items]
Asset early retirement expense					751.0	369.0
Asset early retirement expense after tax					564.0	275.0
Gas, Transmission & Storage \| Atlantic Coast Pipeline \| Supply Header Project
Segment Reporting Information [Line Items]
Cancellation abandonment expense					2,800.0
Cancellation abandonment expense, after tax					2,200.0
Gas, Transmission & Storage \| SCANA
Segment Reporting Information [Line Items]
Charge related to a voluntary retirement program, after-tax						39.0
Gas Distribution \| SCANA
Segment Reporting Information [Line Items]
Charge related to a voluntary retirement program, after-tax						53.0
Contracted Generation \| SCANA
Segment Reporting Information [Line Items]
Charge related to a voluntary retirement program, after-tax						38.0
Contracted Generation \| Operating Segments
Segment Reporting Information [Line Items]
Gain loss on investments held in nuclear decommissioning trust funds, after tax					$ 100.0	$ 222.0