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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 |  |  |  | $ 2,063 |  | $ 195 |  | $ 2,105
Asset retirement obligations |  |  |  | 5,576 | [1] | 5,473 | [1] | 5,583
Income tax expense (benefit) from discontinued operations |  |  |  | $ 8 |  | 188 |  | $ (204)
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) |  |
Q-Pipe Transaction |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Benefit associated with the termination | $ 25 |  |  |  |  |  |  |
Supply Header Project | 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 | GT&S Transaction |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Asset retirement obligations |  |  | $ 75 |  |  |  |  |
[1] | Includes $198 million and $368 million reported in other current liabilities for Dominion Energy at December 31, 2021 and 2022, respectively.

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