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Debt instrument maturity month and year.

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Disposal group including discontinued operation cash consideration.

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Disposal group, including discontinued operation, deposits.

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Disposal group including discontinued operation initial fair value.

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Nominal or face amount used to calculate payment on derivative.

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The excess amount received or due over net assets in a transaction accounted for as a divestiture where a subsidiary, business or operating assets are "sold" by the entity to a newly formed, thinly capitalized, highly leveraged buyer. This gain is not yet recognized and is disclosed on the balance sheet as an offset against the carrying amount of the securities received.

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Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

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Description of the facts and circumstances leading to the completed or expected disposal, and the manner and timing of that disposal.

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Amount of revenue attributable to disposal group, including, but not limited to, discontinued operation.

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Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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Acquisitions and Dispositions (Disposition of Gas Transmission & Storage Operations) (Narrative) (Detail) - USD ($)		1 Months Ended		12 Months Ended
	Nov. 30, 2020	Dec. 31, 2021	Jul. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Oct. 31, 2021	Oct. 31, 2020	Jul. 31, 2020
Business Acquisition And Dispositions [Line Items]
Income tax expense	$ 336,000,000	$ 173,000,000		$ 425,000,000	$ 83,000,000	$ 209,000,000
Term Loan Credit Agreement
Business Acquisition And Dispositions [Line Items]
Credit facility, amount borrowed			$ 1,300,000,000
Credit facility, description				The agreement matured in December 2021 and bore interest at a variable rate.
Debt, maturity month and year			2021-12
GT&S Transaction
Business Acquisition And Dispositions [Line Items]
Operating revenue				$ 5,000,000	4,000,000	$ 6,000,000
Derivative payment								$ 165,000,000
GT&S Transaction \| BHE
Business Acquisition And Dispositions [Line Items]
Disposal group, total value of consideration									$ 10,000,000,000
Disposal group, cash consideration					222,000,000				$ 4,000,000,000.0
Cash proceeds received	2,700,000,000
Disposal group, recognized a pre-tax gain upon closing	127,000,000
Goodwill write-off	$ 1,400,000,000
GT&S Transaction \| BHE \| Transition Service Agreement
Business Acquisition And Dispositions [Line Items]
Operating revenue				$ 21,000,000	$ 4,000,000
Disposal group, administrative services description				Dominion Energy will continue to provide specified administrative services to support the operations of the disposed business for up to 24 months after closing, subsequently extended through June 2023 for certain services.
GT&S Transaction \| BHE \| Cove Point
Business Acquisition And Dispositions [Line Items]
Percentage ownership in total units	50.00%
Disposal group, initial fair value	$ 2,800,000,000
GT&S Transaction \| BHE \| General Partner Interest
Business Acquisition And Dispositions [Line Items]
Percentage ownership in total units									100.00%
GT&S Transaction \| BHE \| Limited Partner Interests
Business Acquisition And Dispositions [Line Items]
Percentage ownership in total units									25.00%
Q-Pipe Group \| BHE
Business Acquisition And Dispositions [Line Items]
Disposal group, cash consideration								$ 1,300,000,000
Q-Pipe Group \| Southwest Gas
Business Acquisition And Dispositions [Line Items]
Disposal group, total value of consideration							$ 2,000,000,000
Disposal group, cash consideration							$ 1,500,000,000
Cash proceeds received		1,500,000,000
Disposal group, recognized a pre-tax gain upon closing		666,000,000		$ 666,000,000
Goodwill write-off		$ 191,000,000
Disposal group, administrative services description				Dominion Energy will continue to provide specified administrative services to support the operations of the disposed businesses for up to 12 months after closing, subject to extension.
Q-Pipe Transaction \| BHE
Business Acquisition And Dispositions [Line Items]
Disposal group, including discontinued operation, deposits	$ 1,300,000,000