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Acquisitions and Dispositions - (Schedule of Results of Operations of Disposal Groups Reported As Discontinued Operations) (Parenthetical) (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2024 | Mar. 31, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Income tax expense (benefit) |  | $ 51 |  | $ 56
Impairment of assets and other charges |  | 30 |  | 98
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) |  | (69) |  | (9)
East Ohio | Enbridge |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Income tax expense (benefit) |  | $ 9 | [1] | $ 13
Employee benefit plans | $ 45 |  |  |
Employee benefit plans after tax | $ 33 |  |  |
[1] | Represents amounts attributable to Dominion Energy prior to the closing of the East Ohio Transaction which closed on March 6, 2024.

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