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Acquisitions and Dispositions - (Schedule of Results of Operations of Disposal Groups Reported As Discontinued Operations) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Income tax expense (benefit) |  | $ (1) | $ 54
Net income (loss) attributable to Dominion Energy |  | $ (1) | 118
East Ohio | Enbridge |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Operating revenue | [1] |  | 229
Operating expense | [1],[2] |  | 247
Other income (expense) | [1] |  | (17)
Interest and related charges | [1] |  | 15
Income (loss) before income taxes | [1] |  | (50)
Income tax expense (benefit) | [1] |  | 11
Net income (loss) attributable to Dominion Energy | [1],[3] |  | (61)
PSNC | Enbridge |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Operating revenue | [1] |  | 298
Operating expense | [1],[2] |  | 158
Other income (expense) | [1] |  | 3
Interest and related charges | [1] |  | 14
Income (loss) before income taxes | [1] |  | 129
Income tax expense (benefit) | [1] |  | 31
Net income (loss) attributable to Dominion Energy | [1],[3] |  | 98
Questar Gas and Wexpro | Enbridge |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Operating revenue | [1] |  | 695
Operating expense | [1],[2] |  | 575
Other income (expense) | [1] |  | 1
Interest and related charges | [1] |  | 16
Income (loss) before income taxes | [1] |  | 105
Income tax expense (benefit) | [1] |  | 84
Net income (loss) attributable to Dominion Energy | [1],[3] |  | 21
Other Sales |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Operating revenue |  |  | 0
Operating expense | [2] |  | 1
Other income (expense) |  |  | 0
Interest and related charges |  |  | 0
Income (loss) before income taxes |  |  | (1)
Income tax expense (benefit) |  |  | 0
Net income (loss) attributable to Dominion Energy | [3] |  | $ (1)
[1] | Represents amounts attributable to Dominion Energy prior to the closing of the East Ohio Transaction which closed on March 6, 2024.
[2] | East Ohio Transaction includes a charge of $45 million ($33 million after-tax) associated with an increase to certain pension retirement benefits attributable to a plan amendment and a contribution to the defined contribution employee savings plan. See Note 20 for further information on these transactions.
[3] | Excludes $(69) million of income tax expense (benefit) attributable to consolidated state adjustments for the three months ended March 31, 2024.

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