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Acquisitions and Dispositions (Schedule of Results of Operations of Disposal Groups Reported As Discontinued Operations) (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  | $ 2,062 |  | $ 194 |  | $ 2,104 |
Asset retirement obligations |  |  |  | 5,427 | [1] | 5,333 | [1] | 5,221 |
Income tax expense (benefit) from discontinued operations |  |  |  | 225 |  | 374 |  | (61) |
Disposition of GTS Operations | GT&S Transaction |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Loss associated with cash flow hedges of debt-related items |  | $ 237 |  |  |  |  |  |  |
Loss associated with cash flow hedges of debt-related items after tax |  | $ 178 |  |  |  |  |  |  |
Income tax expense (benefit) from discontinued operations |  |  |  |  |  | 17 |  | 334 | [2],[3]
Disposition of GTS Operations | Q-Pipe Transaction |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Benefit associated with the termination | $ 25 |  |  |  |  |  |  |  |
Income tax expense (benefit) from discontinued operations |  |  |  |  |  | 36 | [4] | (9) | [2]
Business Review Dispositions |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Income tax expense (benefit) |  |  |  | (3) |  | 19 |  | 24 |
Business Review Dispositions | East Ohio Transaction |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Income tax expense (benefit) from discontinued operations |  |  |  | 45 |  | 38 |  | 35 | [2]
Business Review Dispositions | PSNC Transaction |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Income tax expense (benefit) from discontinued operations |  |  |  | 34 |  | 27 |  | 30 | [2]
Business Review Dispositions | Questar Gas Transaction |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Income tax expense (benefit) from discontinued operations |  |  |  | $ 50 |  | $ 42 |  | $ 45 | [2]
Supply Header Project | Disposition of GTS Operations | GT&S Transaction |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  | $ 482 |  |  |  |  |  |
Asset impairment charges after tax |  |  | 359 |  |  |  |  |  |
Atlantic Coast Pipeline Project | Disposition of GTS Operations | GT&S Transaction |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Asset retirement obligations |  |  | $ 75 |  |  |  |  |  |
[1] | Includes $196 million and $365 million reported in other current liabilities for Dominion Energy at December 31, 2021 and 2022, respectively.
[2] | Excludes $17 million income tax benefit recorded in 2021 associated with the GT&S Transaction.
[3] | Operations associated with the GT&S Transaction are through the November 1, 2020 close date.
[4] | Operations associated with the Q-Pipe Group are through the December 31, 2021 closing date.

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