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Operating Revenue (Schedule of Operating Revenue) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Public Utilities General Disclosures [Line Items]        
Operating revenue from contracts with customers $ 4,510 $ 3,785 $ 12,313 $ 10,764
Other revenues [1],[2] 17 156 100 295
Total operating revenue 4,527 3,941 12,413 11,059
Regulated Electric Sales | Residential        
Public Utilities General Disclosures [Line Items]        
Operating revenue from contracts with customers 1,712 1,535 4,628 4,184
Regulated Electric Sales | Commercial        
Public Utilities General Disclosures [Line Items]        
Operating revenue from contracts with customers [3] 1,627 1,248 4,211 3,533
Regulated Electric Sales | Industrial        
Public Utilities General Disclosures [Line Items]        
Operating revenue from contracts with customers 245 216 649 642
Regulated Electric Sales | Government and Other Retail        
Public Utilities General Disclosures [Line Items]        
Operating revenue from contracts with customers 344 303 954 812
Regulated Electric Sales | Wholesale        
Public Utilities General Disclosures [Line Items]        
Operating revenue from contracts with customers 54 39 135 108
Nonregulated Electric Sales        
Public Utilities General Disclosures [Line Items]        
Operating revenue from contracts with customers 295 239 905 693
Regulated Gas Sales | Residential        
Public Utilities General Disclosures [Line Items]        
Operating revenue from contracts with customers 32 30 249 223
Regulated Gas Sales | Commercial        
Public Utilities General Disclosures [Line Items]        
Operating revenue from contracts with customers 24 24 105 100
Regulated Gas Sales | Other        
Public Utilities General Disclosures [Line Items]        
Operating revenue from contracts with customers 7 15 39 50
Regulated Gas Transportation and Storage        
Public Utilities General Disclosures [Line Items]        
Operating revenue from contracts with customers 10 6 26 15
Other Regulated Revenue        
Public Utilities General Disclosures [Line Items]        
Operating revenue from contracts with customers 100 87 243 293
Other Nonregulated Revenues        
Public Utilities General Disclosures [Line Items]        
Operating revenue from contracts with customers [2],[4],[5] 60 43 169 111
Virginia Electric and Power Company        
Public Utilities General Disclosures [Line Items]        
Operating revenue from contracts with customers 3,279 2,705 8,690 7,590
Other revenues [1],[2] 32 57 98 198
Total operating revenue 3,311 2,762 8,788 7,788
Virginia Electric and Power Company | Regulated Electric Sales | Residential        
Public Utilities General Disclosures [Line Items]        
Operating revenue from contracts with customers 1,279 1,155 3,494 3,183
Virginia Electric and Power Company | Regulated Electric Sales | Commercial        
Public Utilities General Disclosures [Line Items]        
Operating revenue from contracts with customers [3] 1,353 998 3,489 2,851
Virginia Electric and Power Company | Regulated Electric Sales | Industrial        
Public Utilities General Disclosures [Line Items]        
Operating revenue from contracts with customers 130 113 327 330
Virginia Electric and Power Company | Regulated Electric Sales | Government and Other Retail        
Public Utilities General Disclosures [Line Items]        
Operating revenue from contracts with customers 324 285 900 763
Virginia Electric and Power Company | Regulated Electric Sales | Wholesale        
Public Utilities General Disclosures [Line Items]        
Operating revenue from contracts with customers 41 29 107 82
Virginia Electric and Power Company | Nonregulated Electric Sales        
Public Utilities General Disclosures [Line Items]        
Operating revenue from contracts with customers 40 30 105 69
Virginia Electric and Power Company | Other Regulated Revenue        
Public Utilities General Disclosures [Line Items]        
Operating revenue from contracts with customers 96 84 230 282
Virginia Electric and Power Company | Other Nonregulated Revenues        
Public Utilities General Disclosures [Line Items]        
Operating revenue from contracts with customers [2],[4],[5] $ 16 $ 11 $ 38 $ 30
[1] Includes alternative revenue of $35 million and $24 million for the three months ended September 30, 2025 and 2024, respectively, and $117 million and $85 million for the nine months ended September 30, 2025 and 2024, respectively, at both Dominion Energy and Virginia Power.
[2] See Note 19 for amounts attributable to affiliates.
[3] Includes large scale users including certain data center customers.
[4] Includes revenue from transition services agreements of $23 million and $17 million for the three months ended September 30, 2025 and 2024, respectively, and $74 million and $34 million for the nine months ended September 30, 2025 and 2024, respectively, at Dominion Energy.
[5] Includes sales of renewable energy credits of $8 million and $10 million for the three months ended September 30, 2025 and 2024, respectively, and $23 million and $22 million for the nine months ended September 30, 2025 and 2024, respectively, at Dominion Energy and $4 million for both the three months ended September 30, 2025 and 2024 and $10 million and $9 million for the nine months ended September 30, 2025 and 2024, respectively, at Virginia Power.