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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
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Income tax expense (benefit) |  | $ 1,300 |  | $ 197 |  | $ 374 |
Net income (loss) attributable to Dominion Energy |  | (163) |  | 894 |  | 1,358 |
East Ohio | Enbridge |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Operating revenue |  | 1,037 |  | 1,043 |  | 908 |
Operating expense |  | 701 | [1] | 702 | [2] | 620 |
Other income (expense) |  | 30 |  | 28 |  | 25 |
Interest and related charges |  | 71 |  | 36 |  | 18 |
Income (loss) before income taxes |  | 295 |  | 333 |  | 295 |
Income tax expense (benefit) |  | 69 | [3] | 45 |  | 38 |
Net income (loss) attributable to Dominion Energy |  | 226 | [4] | 288 | [5] | 257 | [6]
PSNC | Enbridge |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Operating revenue |  | 743 |  | 841 |  | 613 |
Operating expense |  | 517 | [1] | 648 | [2] | 451 |
Other income (expense) |  | 11 |  | 9 |  | 11 |
Interest and related charges |  | 52 |  | 43 |  | 35 |
Income (loss) before income taxes |  | 185 |  | 159 |  | 138 |
Income tax expense (benefit) |  | 431 | [3] | 34 |  | 27 |
Net income (loss) attributable to Dominion Energy |  | (246) | [4] | 125 | [5] | 111 | [6]
Questar Gas and Wexpro | Enbridge |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Operating revenue |  | 1,679 |  | 1,341 |  | 1,020 |
Operating expense |  | 1,602 | [1] | 1,043 | [2] | 761 |
Other income (expense) |  | 8 |  |  |  | (1) |
Interest and related charges |  | 68 |  | 45 |  | 35 |
Income (loss) before income taxes |  | 17 |  | 253 |  | 223 |
Income tax expense (benefit) |  | 521 | [3] | 50 |  | 42 |
Net income (loss) attributable to Dominion Energy |  | (504) | [4] | 203 | [5] | 181 | [6]
Other Sales |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Operating revenue |  | 15 |  | 11 |  | 5 |
Operating expense |  | 111 | [1] | 118 | [2] | 6 |
Other income (expense) |  | 0 |  |  |  |  |
Interest and related charges |  | 1 |  |  |  |  |
Income (loss) before income taxes |  | (97) |  | (107) |  | (1) |
Income tax expense (benefit) |  | (38) | [3] | (28) |  | (1) |
Net income (loss) attributable to Dominion Energy |  | $ (59) | [4] | $ (79) | [5] |  |
Disposition of Gas Transportation & Storage Operations | Q-Pipe Group |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Operating revenue | [7] |  |  |  |  | 254 |
Operating expense | [7] |  |  |  |  | 76 |
Other income (expense) | [7],[8] |  |  |  |  | 28 |
Interest and related charges | [7] |  |  |  |  | 25 |
Income (loss) before income taxes | [7] |  |  |  |  | 181 |
Income tax expense (benefit) | [7] |  |  |  |  | 36 |
Net income (loss) attributable to Dominion Energy | [7],[9] |  |  |  |  | $ 145 |
[1] | 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 $284 million ($279 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.
[2] | Other includes a charge of $103 million ($76 million after-tax) associated with the impairment of a nonregulated solar generation asset.
[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] | Excludes $(3) million of income tax expense (benefit) attributable to consolidated state tax adjustments for the year ended December 31, 2022.
[6] | Excludes $19 million of income tax expense (benefit) attributable to consolidated state tax adjustments for the year ended December 31, 2021.
[7] | Operations associated with the Q-Pipe Group are through the December 31, 2021 closing date.
[8] | Q-Pipe Group includes a $25 million benefit associated with the termination of the Q-Pipe Transaction in 2021.
[9] | Excludes $19 million of income tax expense (benefit) attributable to consolidated state and interim period tax allocation adjustments for the year ended December 31, 2021.

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