Asset early retirement expense.

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Asset early retirement expense after tax.

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Benefit from revision of environmental remediation expense.

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Benefit from revision of environmental remediation expense after tax.

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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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Customer refundable fees refund payments after tax.

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Litigation settlement expense net of tax.

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Operating revenue recorded charge.

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Operating revenue recorded charge after tax.

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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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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 after tax and reclassification adjustments of other comprehensive income (loss).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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 (Narrative) (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Dec. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Gain loss on investments held in nuclear decommissioning trust funds, after tax		$ (225.0)	$ (31.0)
SCANA
Segment Reporting Information [Line Items]
Litigation settlement expense	$ 192.5
Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Asset early retirement expense after tax			119.0
Gain loss on investments held in nuclear decommissioning trust funds, after tax		(46.0)	(5.0)
Benefit from revision of future closure costs			113.0
Benefit from revision of future closure costs, after tax			84.0
Asset early retirement expense			160.0
Operating Segments
Segment Reporting Information [Line Items]
After- tax net expenses		1,000.0	1,300.0
Gain loss on investments held in nuclear decommissioning trust funds		538.0
Gain loss on investments held in nuclear decommissioning trust funds, after tax		410.0	197.0
Operating Segments \| Virginia Electric and Power Company
Segment Reporting Information [Line Items]
After- tax net expenses		634.0	324.0
Asset early retirement expense after tax		561.0	275.0
Gain loss on investments held in nuclear decommissioning trust funds		62.0
Gain loss on investments held in nuclear decommissioning trust funds, after tax		46.0
Asset early retirement expense		754.0	369.0
Operating revenue recorded charge			29.0
Operating revenue recorded charge, after tax			22.0
Corporate and Other \| Operating Segments
Segment Reporting Information [Line Items]
After- tax net expenses		1,200.0	1,600.0
Corporate and Other \| Operating Segments \| Virginia Electric and Power Company
Segment Reporting Information [Line Items]
After- tax net expenses		700.0	344.0
Dominion Energy South Carolina Inc
Segment Reporting Information [Line Items]
Charge for refund of amounts from customers			1,000.0
Charge for refund of amounts from customers, after tax			756.0
Dominion Energy South Carolina Inc \| SCANA
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
Litigation settlement expense			178.0
Litigation settlement expense, after tax			133.0
Merger and integration-related costs			106.0
Merger and integration-related costs, after tax			81.0
Charge for property, plant and equipment acquired but committed to forgo recovery			105.0
Charge for property, plant and equipment acquired but committed to forgo recovery, after tax			79.0
Dominion Energy Virginia \| Virginia Electric and Power Company \| 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 \| Virginia Electric and Power Company \| 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 \| Operating Segments
Segment Reporting Information [Line Items]
Gain loss on investments held in nuclear decommissioning trust funds			253.0
Gain loss on investments held in nuclear decommissioning trust funds, after tax		46.0	22.0
Dominion Energy Virginia \| Operating Segments \| Virginia Electric and Power Company \| Electric Generation Facilities
Segment Reporting Information [Line Items]
Asset early retirement expense		754.0	369.0
Asset early retirement expense after tax		566.0	275.0
Contracted Generation \| Operating Segments
Segment Reporting Information [Line Items]
Gain loss on investments held in nuclear decommissioning trust funds, after tax		$ 364.0	$ 175.0