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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 | 12 Months Ended
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Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | $ 225 |  | $ 374 |  | $ (61) |
Net income (loss) including noncontrolling interests |  | $ 197 | $ 152 | $ 212 | $ 411 | $ 717 | $ 170 | $ 155 | $ 315 | 972 | [1],[2] | 1,357 | [1],[2] | (1,334) | [1],[2]
Net income (loss) attributable to Dominion Energy |  |  |  |  |  |  |  |  |  | 972 |  | 1,357 |  | (1,440) |
Disposition of GTS Operations | GT&S Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue | [3] |  |  |  |  |  |  |  |  |  |  |  |  | 1,710 |
Operating expense | [3],[4] |  |  |  |  |  |  |  |  |  |  |  |  | 1,289 |
Other income (expense) | [3] |  |  |  |  |  |  |  |  |  |  |  |  | 88 |
Interest and related charges (benefit) | [3],[5] |  |  |  |  |  |  |  |  |  |  |  |  | 372 |
Income (loss) before income taxes | [3] |  |  |  |  |  |  |  |  |  |  |  |  | 137 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  |  | 17 |  | 334 | [3],[6]
Net income (loss) including noncontrolling interests | [3] |  |  |  |  |  |  |  |  |  |  |  |  | (197) |
Noncontrolling interests | [3] |  |  |  |  |  |  |  |  |  |  |  |  | 106 |
Net income (loss) attributable to Dominion Energy | [3],[7] |  |  |  |  |  |  |  |  |  |  |  |  | (303) |
Disposition of GTS Operations | Q-Pipe Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  |  |  | 254 | [8] | 246 |
Operating expense |  |  |  |  |  |  |  |  |  |  |  | 76 | [8] | 96 | [4]
Other income (expense) |  |  |  |  |  |  |  |  |  |  |  | 28 | [8],[9] | 1 |
Interest and related charges (benefit) |  |  |  |  |  |  |  |  |  |  |  | 25 | [8] | 20 | [5]
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  |  | 181 | [8] | 131 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  |  | 36 | [8] | (9) | [6]
Net income (loss) including noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  | 140 |
Net income (loss) attributable to Dominion Energy |  |  |  |  |  |  |  |  |  |  |  | 145 | [8],[10] | 140 | [7]
Business Review Dispositions | East Ohio Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 1,043 |  | 908 |  | 771 |
Operating expense |  |  |  |  |  |  |  |  |  | 702 |  | 620 |  | 540 | [4]
Other income (expense) |  |  |  |  |  |  |  |  |  | 28 |  | 25 | [9] | 20 |
Interest and related charges (benefit) |  |  |  |  |  |  |  |  |  | 36 |  | 18 |  | (32) | [5]
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  | 333 |  | 295 |  | 283 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 45 |  | 38 |  | 35 | [6]
Net income (loss) including noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  | 248 |
Net income (loss) attributable to Dominion Energy |  |  |  |  |  |  |  |  |  | 288 | [11] | 257 | [10] | 248 | [7]
Business Review Dispositions | PSNC Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 841 |  | 613 |  | 539 |
Operating expense |  |  |  |  |  |  |  |  |  | 648 |  | 451 |  | 376 | [4]
Other income (expense) |  |  |  |  |  |  |  |  |  | 9 |  | 11 | [9] | 12 |
Interest and related charges (benefit) |  |  |  |  |  |  |  |  |  | 43 |  | 35 |  | 38 | [5]
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  | 159 |  | 138 |  | 137 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 34 |  | 27 |  | 30 | [6]
Net income (loss) including noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  | 107 |
Net income (loss) attributable to Dominion Energy |  |  |  |  |  |  |  |  |  | 125 | [11] | 111 | [10] | 107 | [7]
Business Review Dispositions | Questar Gas Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 1,341 |  | 1,020 |  | 938 |
Operating expense |  |  |  |  |  |  |  |  |  | 1,043 |  | 761 |  | 676 | [4]
Other income (expense) |  |  |  |  |  |  |  |  |  |  |  | (1) | [9] | (2) |
Interest and related charges (benefit) |  |  |  |  |  |  |  |  |  | 45 |  | 35 |  | 32 | [5]
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  | 253 |  | 223 |  | 228 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 50 |  | 42 |  | 45 | [6]
Net income (loss) including noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  | 183 |
Net income (loss) attributable to Dominion Energy |  |  |  |  |  |  |  |  |  | 203 | [11] | 181 | [10] | $ 183 | [7]
Business Review Dispositions | Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 5 |  | 4 |  |  |
Operating expense |  |  |  |  |  |  |  |  |  | $ 5 |  | 5 |  |  |
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  |  | (1) |  |  |
Net income (loss) attributable to Dominion Energy | [10] |  |  |  |  |  |  |  |  |  |  | $ (1) |  |  |
[1] | Includes income tax expense (benefit) of $225 million, $374 million and $(61) million for the years ended December 31, 2022, 2021 and 2020, respectively.
[2] | See Note 9 for amounts attributable to related parties.
[3] | Operations associated with the GT&S Transaction are through the November 1, 2020 close date.
[4] | GT&S Transaction includes a charge of $482 million ($359 million after-tax) recorded in 2020 associated with the probable abandonment of a significant portion of the Supply Header Project as well as the establishment of a $75 million ARO as a result of the cancellation of the Atlantic Coast Pipeline Project.
[5] | GT&S Transaction includes a loss of $237 million ($178 million after-tax) recorded in 2020 associated with cash flow hedges of debt-related items that were determined to be probable of not occurring.
[6] | Excludes $17 million income tax benefit recorded in 2021 associated with the GT&S Transaction.
[7] | Excludes $24 million of income tax expense (benefit) attributable to consolidated state and interim period tax allocation adjustments for the year ended December 31, 2020.
[8] | Operations associated with the Q-Pipe Group are through the December 31, 2021 closing date.
[9] | Q-Pipe Group includes a $25 million benefit associated with the termination of the Q-Pipe Transaction in 2021.
[10] | 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.
[11] | Excludes $(3) million of income tax expense (benefit) attributable to consolidated state and interim period tax allocation adjustments for the year ended December 31, 2022.

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