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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, 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 |
Net income (loss) attributable to Dominion Energy | 114 |  | 281 |
East Ohio | Enbridge |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Operating revenue | 229 | [1] | 312 |
Operating expense | 254 | [1],[2] | 216 |
Other income (expense) | (17) | [1] | 8 |
Interest and related charges | 15 | [1] | 15 |
Income (loss) before income taxes | (57) | [1] | 89 |
Income tax expense (benefit) | 9 | [1] | 13 |
Net income (loss) attributable to Dominion Energy | (66) | [1],[3] | 76 | [4]
PSNC | Enbridge |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Operating revenue | 298 |  | 326 |
Operating expense | 158 | [2] | 208 |
Other income (expense) | 3 |  | 2 |
Interest and related charges | 14 |  | 13 |
Income (loss) before income taxes | 129 |  | 107 |
Income tax expense (benefit) | 31 |  | (24) |
Net income (loss) attributable to Dominion Energy | 98 | [3] | 83 | [4]
Questar Gas and Wexpro | Enbridge |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Operating revenue | 695 |  | 730 |
Operating expense | 575 | [2] | 579 |
Other income (expense) | 1 |  | 1 |
Interest and related charges | 16 |  | 16 |
Income (loss) before income taxes | 105 |  | 136 |
Income tax expense (benefit) | 82 |  | 29 |
Net income (loss) attributable to Dominion Energy | 23 | [3] | 107 | [4]
Other Sales | Tredegar Solar Fund I, LLC |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Operating revenue | 0 |  | 1 |
Operating expense | 1 | [2] | 3 |
Income (loss) before income taxes | (1) |  | (2) |
Income tax expense (benefit) | 0 |  | (1) |
Net income (loss) attributable to Dominion Energy | $ (1) | [3] | $ (1) | [4]
[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.
[4] | Excludes $(9) million of income tax expense (benefit) attributable to consolidated state and interim period tax allocation adjustments for three months ended March 31, 2023.

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