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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 9 Months Ended
Sep. 30, 2025
 [1]
Sep. 30, 2024
 [1]
Sep. 30, 2025
Sep. 30, 2024
 [2]
Significant noncash items        
Depreciation, depletion and amortization $ 609 $ 549 $ 1,771 [2] $ 1,791
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 [3]     287  
Significant noncash items        
Depreciation, depletion and amortization [3]     0  
Questar Gas and Wexpro | Enbridge        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Capital expenditures [3]     160  
Significant noncash items        
Depreciation, depletion and amortization [3]     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] 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.