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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Oct. 31, 2021 | Oct. 31, 2020 | Jul. 31, 2020
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |
Income tax expense |  | $ 336,000,000 | $ 173,000,000 |  | $ (148,000,000) | $ 239,000,000 | $ (59,000,000) |  |  |
Goodwill write-off | [1] |  |  |  | $ 110,000,000 |  |  |  |  |
Disposal group, including discontinued operation, deposits |  |  |  | $ 1,300,000 |  |  |  |  |  |
Term Loan Credit Agreement |  |  |  |  |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |
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
Cash proceeds received |  | 2,700,000,000 |  |  |  |  |  |  |  |
Disposal group, recognized a pre-tax gain |  | 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 |  |  |  |  | $ 20,000,000 | 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 |  |  | 666,000,000 |  |  | $ 666,000,000 |  |  |  |
Gain (loss) on held for sale |  |  |  |  | $ 27,000,000 |  |  |  |  |
Gain (loss) on held for sale, after tax |  |  |  |  | $ 20,000,000 |  |  |  |  |
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, subsequently extended through July 2023 for certain services. Dominion Energy recorded $6 million associated with the transition services agreement in operating revenue in the Consolidated Statements of Income for the year ended December 31, 2022. |  |  |  |  |
Q-Pipe Transaction | BHE | Term Loan Credit Agreement |  |  |  |  |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |
Credit facility, amount borrowed |  |  |  | $ 1,300,000,000 |  |  |  |  |  |
[1] | See Note 3 for more information

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