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Acquisitions and Dispositions (Schedule of Results of Operations of Disposal Groups Reported As Discontinued Operations) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Income tax expense (benefit) |  | $ 31 |  | $ 1,300 |  | $ 207 |
Net income (loss) attributable to Dominion Energy |  | 197 |  | (125) |  | 922 | [1]
Tredegar Solar Fund I, LLC |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Operating revenue |  |  |  | 15 |  |  |
Operating expense | [2] |  |  | 111 |  |  |
Other income (expense) |  |  |  | 0 |  |  |
Interest and related charges |  |  |  | 1 |  |  |
Income (loss) before income taxes |  |  |  | (97) |  |  |
Income tax expense (benefit) | [3] |  |  | (38) |  |  |
Net income (loss) attributable to Dominion Energy | [4] |  |  | (59) |  |  |
East Ohio | Enbridge |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Operating revenue |  | 229 | [5] | 1,037 |  | 1,043 |
Operating expense |  | 247 | [5],[6] | 701 | [2] | 702 | [7]
Other income (expense) |  | (17) | [5] | 30 |  | 28 |
Interest and related charges |  | 15 | [5] | 71 |  | 36 |
Income (loss) before income taxes |  | (50) | [5] | 295 |  | 333 |
Income tax expense (benefit) |  | 11 | [5] | 69 | [3] | 45 |
Net income (loss) attributable to Dominion Energy |  | (61) | [5],[8] | 226 | [4] | 288 | [9]
PSNC | Enbridge |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Operating revenue |  | 488 | [5] | 743 |  | 841 |
Operating expense |  | 313 | [5],[6] | 517 | [2] | 648 | [7]
Other income (expense) |  | 11 | [5] | 11 |  | 9 |
Interest and related charges |  | 44 | [5] | 52 |  | 43 |
Income (loss) before income taxes |  | 142 | [5] | 185 |  | 159 |
Income tax expense (benefit) |  | 44 | [5] | 431 | [3] | 34 |
Net income (loss) attributable to Dominion Energy |  | 98 | [5],[8] | (246) | [4] | 125 | [9]
Questar Gas and Wexpro | Enbridge |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Operating revenue |  | 894 | [5] | 1,679 |  | 1,341 |
Operating expense |  | 724 | [5],[6] | 1,554 | [2] | 1,043 | [7]
Other income (expense) |  | 2 | [5] | 8 |  | 37 |
Interest and related charges |  | 25 | [5] | 68 |  | 45 |
Income (loss) before income taxes |  | 147 | [5] | 65 |  | 290 |
Income tax expense (benefit) |  | 54 | [5] | 531 | [3] | 60 |
Net income (loss) attributable to Dominion Energy |  | 93 | [5],[8] | $ (466) | [4] | 230 | [9]
Other Sales |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Operating expense | [6] | (8) |  |  |  |  |
Income (loss) before income taxes |  | 8 |  |  |  |  |
Net income (loss) attributable to Dominion Energy | [8] | $ 8 |  |  |  |  |
Other Sales | Tredegar Solar Fund I, LLC |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  | 11 |
Operating expense | [7] |  |  |  |  | 118 |
Income (loss) before income taxes |  |  |  |  |  | (107) |
Income tax expense (benefit) |  |  |  |  |  | (28) |
Net income (loss) attributable to Dominion Energy | [9] |  |  |  |  | $ (79) |
[1] | As discussed in Note 19, effective in June 2022 through its redemption in September 2022, the Series A Preferred Stock was considered to be mandatorily redeemable and was classified in current liabilities.
[2] | East Ohio Transaction includes a charge of $50 million ($45 million after-tax) primarily for an impairment of associated goodwill, Questar Gas Transaction includes a charge of $236 million ($231 million after-tax) primarily for an impairment of associated goodwill and Other includes a charge of $68 million ($51 million after-tax) associated with the impairment of nonregulated solar generation facility development operations and a charge of $15 million ($11 million after-tax) associated with the impairment of certain nonregulated solar assets.
[3] | Includes amounts to reflect the recognition of deferred taxes on the outside basis of the applicable entities’ stock upon meeting the classification as held for sale.
[4] | Excludes $(3) million of income tax expense (benefit) attributable to consolidated state tax adjustments for the year ended December 31, 2023.
[5] | Represents amoun ts attributable to Dominion Energy prior to the closing of the East Ohio Transaction which closed on March 6, 2024, the PSNC Transaction w hich closed on September 30, 2024 and the Questar Gas Transaction which closed on May 31, 2024.
[6] | 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 22 for further information on these transactions.
[7] | Other includes a charge of $103 million ($76 million after-tax) associated with the impairment of a nonregulated solar generation asset.
[8] | Excludes $(69) million of income tax expense (benefit) attributable to consolidated state tax adjustments for the year ended December 31, 2024.
[9] | Excludes $(4) million of income tax expense (benefit) attributable to consolidated state tax adjustments for the year ended December 31, 2022.

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