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Acquisitions and Dispositions - (Schedule of Capital Expenditures and Significant Noncash Items Reported As Discontinued Operations) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Significant noncash items      
Depreciation, depletion and amortization $ 2,345 [1] $ 2,580 [2] $ 2,442 [3]
Accrued capital expenditures [4],[5] 1,268 1,085 979
Enbridge | East Ohio      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Capital expenditures 65 [6] 507 456
Significant noncash items      
Depreciation, depletion and amortization   148 134
Accrued capital expenditures   42 53
Enbridge | PSNC      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Capital expenditures 287 [6] 233 153
Significant noncash items      
Depreciation, depletion and amortization   90 87
Accrued capital expenditures   43 16
Enbridge | Questar Gas and Wexpro      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Capital expenditures $ 160 [6] 449 438
Significant noncash items      
Depreciation, depletion and amortization   175 163
Accrued capital expenditures   32 31
Tredegar Solar Fund I, LLC | Other Sales      
Significant noncash items      
Depreciation, depletion and amortization   $ 2 $ 4
[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] 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.
[4] See Note 9 for noncash investing activities related to the acquisition of a noncontrolling interest in Dominion Privatization.
[5] See Notes 3, 10, 19, 20 and 23 for noncash financing activities related to debt assumed with closing of the East Ohio, Questar Gas and PSNC Transactions, the sale of noncontrolling interest in the CVOW Commercial Project, remarketing of the Series A Preferred Stock and the issuance of common stock and transfer of property associated with the settlement of litigation.
[6] Represents amounts attributable to Dominion Energy prior to the closing of the East Ohio Transaction which closed on March 6, 2024, the PSNC Transaction which closed on September 30, 2024 and the Questar Gas Transaction which closed on May 31, 2024.