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Acquisitions and Dispositions (Sale of Kewaunee) (Narrative) (Detail) - Dominion Energy Kewaunee, Inc - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Dec. 31, 2022 | May 31, 2021
Business Acquisition And Dispositions [Line Items] |  |  |
Percentage of equity interests expected to be sold |  |  | 100.00%
Disposal group, loss (gain) recorded | $ 649 |  |
Disposal group, loss (gain) recorded after tax | $ 513 |  |
Withdrawal to recover nuclear fuel and other permitted costs |  | $ 80 |

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- Details
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