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Acquisitions and Dispositions (Sale of Kewaunee) (Narrative) (Detail) - Dominion Energy Kewaunee, Inc - USD ($) $ in Millions | 3 Months Ended |
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Mar. 31, 2022 | May 31, 2021
Business Acquisition And Dispositions [Line Items] |  |
Percentage of equity interests expected to be sold |  | 100.00%
Disposal group, expected to recognized a loss | $ 660 |
Disposal group, expected to recognized a loss after tax | $ 520 |

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- Definition Business acquisition and dispositions line items. + References No definition available. + Details
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- Definition Disposal group including discontinued operation gain (loss) on disposal. + References No definition available. + Details
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- Definition Disposal group including discontinued operation gain (loss) on disposal after tax. + References No definition available. + Details
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- Definition Percentage of equity interests expected to be sold. + References No definition available. + Details
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- Details
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