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Acquisitions and Dispositions (Schedule of Results of Operations of Disposal Groups Reported As Discontinued Operations) (Parenthetical) (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Employee benefit plans | $ 82,000,000 |  | $ 85,000,000 |  | $ 75,000,000
Impairment of goodwill | 0 |  |  |  |
Income tax expense (benefit) | 31,000,000 |  | 1,300,000,000 |  | 207,000,000
Impairment of assets and other charges | 600,000,000 |  | 307,000,000 |  | 1,401,000,000
East Ohio | Enbridge |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Employee benefit plans | 45,000,000 |  |  |  |
Employee benefit plans after tax | 33,000,000 |  |  |  |
Impairment of goodwill |  |  | 50,000,000 |  |
Goodwill impairment after tax |  |  | 45,000,000 |  |
Income tax expense (benefit) | 11,000,000 | [1] | 69,000,000 | [2] | 45,000,000
Questar Gas and Wexpro | Enbridge |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Impairment of goodwill |  |  | 236,000,000 |  |
Goodwill impairment after tax |  |  | 231,000,000 |  |
Income tax expense (benefit) | 54,000,000 | [1] | 531,000,000 | [2] | 60,000,000
Other | Nonregulated Solar Assets |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Impairment of assets and other charges |  |  | 68,000,000 |  |
Impairment of assets and other charges after tax |  |  | 51,000,000 |  |
Other | Nonregulated Solar Generation Facility |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Impairment of assets and other charges |  |  | 15,000,000 |  | 103,000,000
Impairment of assets and other charges after tax |  |  | 11,000,000 |  | 76,000,000
East Ohio, PSNC and Questar Gas |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Income tax expense (benefit) | $ (69,000,000) |  | $ (3,000,000) |  | $ (4,000,000)
[1] | Represents amoun ts attributable to Dominion Energy prior to the closing of the East Ohio Transaction which closed on March 6, 2024, the PSNC Transaction w hich closed on September 30, 2024 and the Questar Gas Transaction which closed on May 31, 2024.
[2] | 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.

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