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Acquisitions and Dispositions - (Schedule of Results of Operations of Disposal Groups Reported As Discontinued Operations) (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Income tax expense (benefit) | $ (10) | $ 1,200 |  | $ 22 |  | $ 1,300 |
Impairment of assets and other charges | 122 | 1 |  | 219 |  | 136 |
East Ohio, PSNC and Questar Gas |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Income tax expense (benefit) | $ 2 | 6 |  | (71) |  | 2 |
East Ohio | Enbridge |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Income tax expense (benefit) |  | $ 39 | [1] | 9 | [2] | $ 58 | [1]
Employee benefit plans |  |  |  | 45 |  |  |
Employee benefit plans after tax |  |  |  | 33 |  |  |
Other Sales |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Income tax expense (benefit) |  |  |  | 0 |  |  |
Other Sales | Nonregulated Solar Generation Facility |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  | 15 |  |  |
Impairment of assets and other charges after tax |  |  |  | $ 11 |  |  |
[1] | Includes amounts recorded in the third quarter of 2023 to reflect the recognition of deferred taxes on the outside basis of the applicable entities’ stock upon meeting the classification as held for sale.
[2] | Represents amounts attributable to Dominion Energy prior to the closing of the East Ohio Transaction which closed on March 6, 2024, the PSNC Transaction which closed on September 30, 2024 and the Questar Gas Transaction which closed on May 31, 2024.

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