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.