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Acquisitions and Dispositions (Disposition of Gas Transmission & Storage Operations) (Narrative) (Detail) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2021 | Jul. 31, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Oct. 31, 2021 | Nov. 30, 2020 | Oct. 31, 2020 | Jul. 31, 2020
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |
Income tax expense |  | $ 173 |  | $ 575 | $ 113 | $ (181) |  |  |  |
Goodwill write-off | [1] |  |  |  | 110 |  |  |  |  |
Disposal group, including discontinued operation, deposits |  |  | $ 1,300 |  |  |  |  |  |  |
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 | BHE | Transition Service Agreement |  |  |  |  |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  | $ 9 | 20 | 21 |  |  |  |
Disposal group, administrative services description |  |  |  | Dominion Energy provided specified administrative services to support the operations of the disposed business 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% |  |
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 |
Q-Pipe Group | Southwest Gas |  |  |  |  |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |
Disposal group, total value of consideration |  |  |  |  |  |  | $ 2,000 |  |  |
Disposal group, cash consideration |  |  |  |  |  |  | $ 1,500 |  |  |
Cash proceeds received |  | 1,500 |  |  |  |  |  |  |  |
Disposal group, recognized a pre-tax gain |  | 666 |  |  |  | $ 666 |  |  |  |
Gain (loss) on held for sale |  |  |  |  | 27 |  |  |  |  |
Gain (loss) on held for sale, after tax |  |  |  |  | 20 |  |  |  |  |
Goodwill write-off |  | $ 191 |  |  |  |  |  |  |  |
Q-Pipe Group | Southwest Gas | Transition Service Agreement |  |  |  |  |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  | $ 5 | $ 6 |  |  |  |  |
Disposal group, administrative services description |  |  |  | Dominion Energy provided specified administrative services to support the operations of the disposed businesses through July 2023 for certain services. Dominion Energy recorded $5 million and $6 million associated with the transition services agreement in operating revenue in the Consolidated Statements of Income for the years ended December 31, 2023 and 2022, respectively. |  |  |  |  |  |
Q-Pipe Transaction | BHE | Term Loan Credit Agreement |  |  |  |  |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |
Credit facility, amount borrowed |  |  | $ 1,300 |  |  |  |  |  |  |
[1] | See Note 3 for additional information.

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