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Acquisitions and Dispositions - (Schedule of Results of Operations of Disposal Groups Reported As Discontinued Operations) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]        
Income tax expense (benefit) $ (2) $ (9) $ (5) $ 31
Net income (loss) attributable to Dominion Energy $ 0 (15) $ 0 200
East Ohio | Enbridge        
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]        
Operating revenue [1]       229
Operating expense [1],[2]       247
Other income (expense) [1]       (17)
Interest and related charges [1]       15
Income (loss) before income taxes [1]       (50)
Income tax expense (benefit) [1]       11
Net income (loss) attributable to Dominion Energy [1],[3]       (61)
PSNC | Enbridge        
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]        
Operating revenue [1]   81   488
Operating expense [1],[2]   92   313
Other income (expense) [1]   5   11
Interest and related charges [1]   16   44
Income (loss) before income taxes [1]   (22)   142
Income tax expense (benefit) [1]   (9)   44
Net income (loss) attributable to Dominion Energy [1],[3]   $ (13)   98
Questar Gas and Wexpro | Enbridge        
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]        
Operating revenue [1]       894
Operating expense [1],[2]       724
Other income (expense) [1]       2
Interest and related charges [1]       25
Income (loss) before income taxes [1]       147
Income tax expense (benefit) [1]       54
Net income (loss) attributable to Dominion Energy [1],[3]       93
Other Sales        
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]        
Operating revenue       0
Operating expense [2]       (8)
Other income (expense)       0
Interest and related charges       0
Income (loss) before income taxes       8
Income tax expense (benefit)       0
Net income (loss) attributable to Dominion Energy [3]       $ 8
[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] East Ohio Transaction includes a charge of $45 million ($33 million after-tax) associated with an increase to certain pension retirement benefits attributable to a plan amendment and a contribution to the defined contribution employee savings plan. See Note 20 for further information on these transactions.
[3] Excludes $2 million and $(71) million of income tax expense (benefit) attributable to consolidated state adjustments for the three and nine months ended September 30, 2024, respectively.