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Acquisitions and Dispositions (Disposition of Gas Transmission & Storage Operations to BHE) (Narrative) (Detail) - Gas, Transmission & Storage - BHE - USD ($) $ in Millions | 3 Months Ended |
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Sep. 30, 2020 | Jul. 31, 2020
Dominion Energy | Scenario Forecast |  |
Business Acquisition And Dispositions [Line Items] |  |
Expect to record pre-tax losses | $ 225 |
Dominion Energy Gas Holdings, LLC | Scenario Forecast |  |
Business Acquisition And Dispositions [Line Items] |  |
Expect to record pre-tax losses | $ 140 |
Dominion Energy Gas Holdings, LLC | Subsequent Event |  |
Business Acquisition And Dispositions [Line Items] |  |
Disposal group, total value of consideration |  | $ 10,000
Disposal group, cash consideration |  | $ 4,000
Percentage ownership in total units |  | 50.00%
Disposal group, expects to recognize pre-tax gain upon closing |  | $ 1,000
Disposal group, decrease in cash consideration |  | $ 2,700
Dominion Energy Gas Holdings, LLC | General Partner Interest | Subsequent Event |  |
Business Acquisition And Dispositions [Line Items] |  |
Percentage ownership in total units |  | 100.00%
Dominion Energy Gas Holdings, LLC | Limited Partner Interests | Subsequent Event |  |
Business Acquisition And Dispositions [Line Items] |  |
Percentage ownership in total units |  | 25.00%

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