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Acquisitions and Dispositions (Disposition of Gas Transmission & Storage Operations to BHE) (Narrative) (Detail) - USD ($) $ in Millions |  | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Nov. 30, 2020 | Sep. 30, 2020 | Nov. 01, 2020 | Oct. 31, 2020 | Jul. 31, 2020
Gas, Transmission & Storage | Subsequent Event |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |
Derivative payment |  |  |  | $ 165 |
Gas, Transmission & Storage | BHE | Dominion Energy Questar Pipeline |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |
Goodwill write-off |  | $ 191 |  |  |
Q-Pipe Transaction | BHE |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |
Disposal group, expects to recognize pre-tax gain upon closing |  | $ 500 |  |  |
Dominion Energy Gas Holdings, LLC | Gas, Transmission & Storage | BHE |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |
Disposal group, total value of consideration |  |  |  |  | $ 10,000
Disposal group, closing adjustments |  |  |  |  | $ 4,000
Percentage ownership in total units |  | 50.00% |  |  |
Dominion Energy Gas Holdings, LLC | Gas, Transmission & Storage | BHE | Subsequent Event |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |
Disposal group, total value of consideration | $ 2,700 |  |  |  |
Disposal group, closing adjustments | 200 |  |  |  |
Disposal group, expects to recognize pre-tax gain upon closing | 200 |  |  |  |
Goodwill write-off | $ 1,400 |  |  |  |
Dominion Energy Gas Holdings, LLC | Gas, Transmission & Storage | BHE | Subsequent Event | Dominion Energy Questar Pipeline |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |
Disposal group, cash consideration |  |  |  | $ 1,300 |
Dominion Energy Gas Holdings, LLC | Gas, Transmission & Storage | BHE | General Partner Interest |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |
Percentage ownership in total units |  |  |  |  | 100.00%
Dominion Energy Gas Holdings, LLC | Gas, Transmission & Storage | BHE | Limited Partner Interests |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |
Percentage ownership in total units |  |  |  |  | 25.00%
Dominion Energy Gas Holdings, LLC | Q-Pipe Transaction | BHE | Subsequent Event | Dominion Energy Questar Pipeline |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |
Disposal group, including discontinued operation, deposits |  |  | $ 1,300 |  |

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