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Acquisitions and Dispositions - (Schedule of Capital Expenditures and Significant Noncash Items Reported As Discontinued Operations) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | [1] | Jun. 30, 2024 | [1] | Jun. 30, 2025 | Jun. 30, 2024
Significant noncash items |  |  |  |  |  |  |
Depreciation, depletion and amortization |  | $ 580 | $ 621 | $ 1,162 | [2] | $ 1,242 | [2]
Accrued capital expenditures | [3] |  |  | $ 871 |  | 929 |
East Ohio | Enbridge |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Capital expenditures | [4] |  |  |  |  | 65 |
Significant noncash items |  |  |  |  |  |  |
Depreciation, depletion and amortization | [4] |  |  |  |  | 0 |
PSNC | Enbridge |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  | 189 |
Significant noncash items |  |  |  |  |  |  |
Depreciation, depletion and amortization |  |  |  |  |  | 0 |
Accrued capital expenditures |  |  |  |  |  | 57 |
Questar Gas and Wexpro | Enbridge |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  | 160 |
Significant noncash items |  |  |  |  |  |  |
Depreciation, depletion and amortization |  |  |  |  |  | 0 |
Other Sales |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  | 0 |
Significant noncash items |  |  |  |  |  |  |
Depreciation, depletion and amortization |  |  |  |  |  | $ 0 |
[1] | The significant expense categories and amounts in the segment information presented above align with the segment-level information that is regularly provided to Dominion Energy’s CODM.
[2] | The significant expense categories and amounts in the segment information presented above align with the segment-level information that is regularly provided to Dominion Energy’s CODM.
[3] | See Note 3 for noncash financing activities related to debt assumed with the closing of the East Ohio and Questar Gas Transactions.
[4] | Represents amounts attributable to Dominion Energy prior to the closing of the East Ohio Transaction which closed on March 6, 2024 and the Questar Gas Transaction which closed on May 31, 2024.

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