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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
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | $ (204) |  | $ 142 |  | $ 58 |
Net income (loss) including noncontrolling interests |  | $ (125) | $ 19 | $ (2,001) | $ 229 | $ 190 | $ 38 | $ 257 | $ 231 | (1,878) | [1],[2] | 716 | [1],[2] | 452 | [1],[2]
Net income (loss) attributable to Dominion Energy |  |  |  |  |  |  |  |  |  | (1,984) |  | 705 |  | 360 |
GT&S Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 4 |  | 6 |  | 6 |
Disposition of GT&S Operations to BHE | GT&S Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 1,710 | [3] | 2,213 |  | 2,134 |
Operating Expense | [4],[5] |  |  |  |  |  |  |  |  | 1,289 | [3] | 1,367 |  | 1,663 |
Other income (loss) |  |  |  |  |  |  |  |  |  | 88 | [3] | 58 |  | 68 |
Interest and related charges | [6] |  |  |  |  |  |  |  |  | 372 | [3] | 267 |  | 183 |
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  | 137 | [3] | 637 |  | 356 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 334 | [3] | 120 |  | 40 |
Net income (loss) including noncontrolling interests |  |  |  |  |  |  |  |  |  | (197) | [3] | 517 |  | 316 |
Noncontrolling interests |  |  |  |  |  |  |  |  |  | 106 | [3] | 11 |  | 92 |
Net income (loss) attributable to Dominion Energy |  |  |  |  |  |  |  |  |  | (303) | [3] | 506 |  | 224 |
Disposition of GT&S Operations to BHE | Q-Pipe Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 246 |  | 251 |  | 247 |
Operating Expense | [4],[5] |  |  |  |  |  |  |  |  | 96 |  | 131 |  | 135 |
Other income (loss) |  |  |  |  |  |  |  |  |  | 1 |  | 4 |  | 5 |
Interest and related charges | [6] |  |  |  |  |  |  |  |  | 20 |  | 20 |  | 20 |
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  | 131 |  | 104 |  | 97 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | (9) |  | 23 |  | 18 |
Net income (loss) including noncontrolling interests |  |  |  |  |  |  |  |  |  | 140 |  | 81 |  | 79 |
Net income (loss) attributable to Dominion Energy |  |  |  |  |  |  |  |  |  | $ 140 |  | $ 81 |  | $ 79 |
[1] | Includes income tax expense (benefit) of $(204) million, $142 million and $58 million for the years ended December 31, 2020, 2019 and 2018, 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 settlement date.
[4] | GT&S Transaction includes a charge of $482 million ($359 million after-tax) recorded in the second quarter of 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 gains on sales of assets recorded in 2018 totaling $115 million ($83 million after-tax), associated with the conveyance of Marcellus Shale and Utica and Point Pleasant Shale acreage underneath its natural gas storage fields.
[6] | GT&S Transaction includes a loss of $237 million ($178 million after-tax) recorded in the third quarter of 2020 associated with cash flow hedges of debt-related items that were determined to be probable of not occurring.

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