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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 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.
[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.