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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 | 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 |
Net income (loss) attributable to Dominion Energy |  | (13) |  | (541) |  | 182 |  | (92) |
East Ohio | Enbridge |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  | 214 |  | 229 | [1] | 761 |
Operating expense |  |  |  | 128 | [2] | 254 | [1],[3] | 497 | [2]
Other income (expense) |  |  |  | 7 |  | (17) | [1] | 22 |
Interest and related charges |  |  |  | 19 |  | 15 | [1] | 51 |
Income (loss) before income taxes |  |  |  | 74 |  | (57) | [1] | 235 |
Income tax expense (benefit) |  |  |  | 39 | [4] | 9 | [1] | 58 | [4]
Net income (loss) attributable to Dominion Energy |  |  |  | 35 | [5] | (66) | [1],[6] | 177 | [5]
PSNC | Enbridge |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Operating revenue |  | 81 | [1] | 86 |  | 488 | [1] | 532 |
Operating expense |  | 91 | [1],[3] | 80 | [2] | 312 | [1],[3] | 386 | [2]
Other income (expense) |  | 5 | [1] | 3 |  | 11 | [1] | 8 |
Interest and related charges |  | 16 | [1] | 13 |  | 44 | [1] | 38 |
Income (loss) before income taxes |  | (21) | [1] | (4) |  | 143 | [1] | 116 |
Income tax expense (benefit) |  | (9) | [1] | 383 | [4] | 44 | [1] | 409 | [4]
Net income (loss) attributable to Dominion Energy |  | $ (12) | [1],[6] | (387) | [5] | 99 | [1],[6] | (293) | [5]
Questar Gas and Wexpro | Enbridge |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  | 150 |  | 894 | [1] | 1,151 |
Operating expense |  |  |  | 127 | [2] | 746 | [1],[3] | 939 | [2]
Other income (expense) |  |  |  | 3 |  | 2 | [1] | 6 |
Interest and related charges |  |  |  | 17 |  | 25 | [1] | 50 |
Income (loss) before income taxes |  |  |  | 9 |  | 125 | [1] | 168 |
Income tax expense (benefit) |  |  |  | 525 | [4] | 46 | [1] | 557 | [4]
Net income (loss) attributable to Dominion Energy |  |  |  | (516) | [5] | 79 | [1],[6] | (389) | [5]
Other Sales |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  | 0 |  |  |
Operating expense | [3] |  |  |  |  | (8) |  |  |
Other income (expense) |  |  |  |  |  | 0 |  |  |
Interest and related charges |  |  |  |  |  | 0 |  |  |
Income (loss) before income taxes |  |  |  |  |  | 8 |  |  |
Income tax expense (benefit) |  |  |  |  |  | 0 |  |  |
Net income (loss) attributable to Dominion Energy | [6] |  |  |  |  | $ 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 |  |  |  | 2 |  |  |  | 5 |
Operating expense | [2] |  |  | 7 |  |  |  | 29 |
Other income (expense) |  |  |  | 0 |  |  |  | 0 |
Interest and related charges |  |  |  | 0 |  |  |  | 1 |
Income (loss) before income taxes |  |  |  | (5) |  |  |  | (25) |
Income tax expense (benefit) | [4] |  |  | (2) |  |  |  | (7) |
Net income (loss) attributable to Dominion Energy | [5] |  |  | $ (3) |  |  |  | $ (18) |
[1] | 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.
[2] | Other includes a charge of $15 million ($11 million after-tax) recorded in the second quarter of 2023 associated with the impairment of certain nonregulated solar assets.
[3] | 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.
[4] | 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.
[5] | Excludes $6 million and $2 million of income tax expense attributable to consolidated state and interim period tax allocation adjustments for the three and nine months ended September 30, 2023, respectively.
[6] | Excludes $2 million and $(71) million of income tax expense (benefit) attributable to consolidated state adjustments for the three and nine months ended September 30, 2024, respectively.

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