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.

No definition available.

+ Details

Name:	us-gaap_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460

+ Details

Name:	us-gaap_BusinessCombinationAcquisitionRelatedCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Details

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Namespace Prefix:
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- Details

Name:	dei_LegalEntityAxis=d_DominionEnergyMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_RetirementPlanNameAxis=d_VoluntaryRetirementProgramMember
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Data Type:	na
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- Details

Name:	us-gaap_IncomeStatementLocationAxis=d_OtherOperationsAndMaintenanceExpenseMember
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- Details

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Acquisitions and Dispositions (Results of Operations and Pro Forma Information) (Narrative) (Detail) - SCANA [Member] - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Increase in operating revenue		$ 3,100
Decrease in net income		(1,100)
Merger and integration-related costs	$ 1,300	484
Dominion Energy [Member]
Business Acquisition [Line Items]
Merger and integration-related costs		646	$ 27
Dominion Energy [Member] \| Voluntary Retirement Program [Member]
Business Acquisition [Line Items]
Merger and integration-related costs		427
Dominion Energy [Member] \| Other operations and maintenance
Business Acquisition [Line Items]
Merger and integration-related costs		210
Dominion Energy [Member] \| Interest And Related Charges
Business Acquisition [Line Items]
Merger and integration-related costs		$ 9