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Property, Plant and Equipment (Narrative) (Detail)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Jun. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
MVA
Property, Plant and Equipment [Line Items]            
Noncontrolling Interests $ 22 [1] $ 0   $ 122 [2] $ 0  
Income tax expense (benefit) 216 [3] 213 [3]   476 [4] 421 [4]  
Impairment of assets and other charges 130 122   226 219  
Corporate Office Building | Level 3            
Property, Plant and Equipment [Line Items]            
Long-lived assets, estimated fair values     $ 23      
Corporate Office Building | Impairment of Assets and Other Charges            
Property, Plant and Equipment [Line Items]            
Impairment of assets and other charges     17      
Asset impairment charges after tax     12      
Nonregulated renewable natural gas facilities | Minimum | Level 3            
Property, Plant and Equipment [Line Items]            
Long-lived assets, estimated fair values   1 1   1  
Nonregulated renewable natural gas facilities | Impairment of Assets and Other Charges            
Property, Plant and Equipment [Line Items]            
Impairment of assets and other charges   27 33      
Asset impairment charges after tax   21 $ 25      
Virginia Electric and Power Company            
Property, Plant and Equipment [Line Items]            
Noncontrolling Interests 22 [5] 0   122 [6] 0  
Income tax expense (benefit) 151 [7] $ 146 [7]   356 [8] $ 399 [8]  
Virginia Electric and Power Company | CVOW Commercial Project            
Property, Plant and Equipment [Line Items]            
Charge for costs not expected to be recovered 128     224    
Noncontrolling Interests $ 64     $ 112    
Percentage of remaining construction costs, including contingency 7.00%     7.00%    
Income tax expense (benefit) $ 16     $ 28    
Ownership percentage           50.00%
Virginia Electric and Power Company | CVOW Commercial Project | End of 2026            
Property, Plant and Equipment [Line Items]            
Targeted capacity provided by legislation | MVA           2.6
Anticipated projected cost           $ 11,200
Virginia Electric and Power Company | CVOW Commercial Project | End of 2026 | Maximum            
Property, Plant and Equipment [Line Items]            
Anticipated projected cost 200     200    
Virginia Electric and Power Company | CVOW Commercial Project | August 2025 Construction Update Filing            
Property, Plant and Equipment [Line Items]            
Anticipated projected cost 300     300    
Virginia Electric and Power Company | CVOW Commercial Project | February 2025 Construction Update Filing            
Property, Plant and Equipment [Line Items]            
Anticipated projected cost $ 500     $ 500    
[1] Items designated are other segment items for each reportable segment.
[2] Items designated are other segment items for each reportable segment.
[3] 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.
[4] 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.
[5] Items designated are other segment items for each reportable segment.
[6] Items designated are other segment items for each reportable segment.
[7] The significant expense categories and amounts in the segment information presented above align with the segment-level information that is regularly provided to Virginia Power’s CODM.
[8] The significant expense categories and amounts in the segment information presented above align with the segment-level information that is regularly provided to Virginia Power’s CODM.