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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
Mar. 31, 2025
Mar. 31, 2024
Significant noncash items    
Depreciation, depletion and amortization [1] $ 582 $ 621
Accrued capital expenditures [2] $ 1,037 753
East Ohio | Enbridge    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Capital expenditures [3]   65
Significant noncash items    
Depreciation, depletion and amortization [3]   0
PSNC | Enbridge    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Capital expenditures   82
Significant noncash items    
Depreciation, depletion and amortization   0
Accrued capital expenditures   55
Questar Gas and Wexpro | Enbridge    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Capital expenditures   100
Significant noncash items    
Depreciation, depletion and amortization   0
Accrued capital expenditures   20
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
Accrued capital expenditures   $ 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] See Note 3 for noncash financing activities related to debt assumed with the closing of the East Ohio Transaction.
[3] Represents amounts attributable to Dominion Energy prior to the closing of the East Ohio Transaction which closed on March 6, 2024.