v3.26.1
Property, Plant and Equipment (Narrative) (Detail)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2026
USD ($)
May 31, 2026
USD ($)
Apr. 30, 2026
USD ($)
Jan. 31, 2026
USD ($)
Jun. 30, 2026
USD ($)
Mar. 31, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
GW
Oct. 31, 2024
Property, Plant and Equipment [Line Items]                      
Noncontrolling Interests         $ (11) [1]   $ 54 [1] $ 153 [2] $ 100 [2]    
Income tax expense (benefit)         122 [3]   220 [3] 170 [4],[5] 260 [4]    
Virginia Electric and Power Company                      
Property, Plant and Equipment [Line Items]                      
Excepted total project cost increase   $ 400   $ 400              
Excepted total project cost decrease   400   $ 400              
Approximate tariffs cost on equipment expected to be delivered               200      
Noncontrolling Interests         (11) [6]   54 [6] 153 [7] 100 [7]    
Income tax expense (benefit)         154 [8]   115 [8] 299 [5],[9] 205 [9]    
Virginia Electric and Power Company | Subsequent Event                      
Property, Plant and Equipment [Line Items]                      
Increase in estimated project cost $ 300                    
Virginia Electric and Power Company | CVOW Commercial Project                      
Property, Plant and Equipment [Line Items]                      
Charge (benefit) for costs not expected to be recovered including noncontrolling portion         246   51 129 96    
Noncontrolling Interests         123   26 64 48    
Income tax expense (benefit)         $ (32)   $ (6) $ (17) $ (12)    
Ownership percentage         50.00%     50.00%     50.00%
Percentage of remaining construction costs, including contingency         7.00%     7.00%      
End of 2027 | Virginia Electric and Power Company                      
Property, Plant and Equipment [Line Items]                      
Increase in estimated project cost               $ 200      
End of 2027 | Virginia Electric and Power Company | CVOW Commercial Project                      
Property, Plant and Equipment [Line Items]                      
Targeted capacity provided by legislation | GW                   2.6  
Anticipated projected cost                   $ 11,700  
Anticipated project cost contingency                   $ 100  
Nonregulated Renewable Natural Gas Facilities [Member] | Level 3                      
Property, Plant and Equipment [Line Items]                      
Long-lived assets, estimated fair value         $ 468     468      
Nonregulated Renewable Natural Gas Facilities [Member] | Impairment of Assets and Other Charges                      
Property, Plant and Equipment [Line Items]                      
Impairment of assets and other charges         820     820      
Asset impairment charges after tax         640     640      
Nonregulated Solar Generation Facilities                      
Property, Plant and Equipment [Line Items]                      
Long lived asset held for sale         $ 262     $ 262      
Nonregulated Solar Generation Facilities | Impairment of Assets and Other Charges                      
Property, Plant and Equipment [Line Items]                      
Impairment of assets and other charges           $ 78          
Asset impairment charges after tax           60          
Nonregulated Solar Generation Facilities | Other Sales                      
Property, Plant and Equipment [Line Items]                      
Disposal group, cash consideration   $ 140                  
Minimum | Virginia Electric and Power Company                      
Property, Plant and Equipment [Line Items]                      
Increase in estimated project cost     $ 100                
Minimum | Nonregulated Solar Generation Facilities | Level 3                      
Property, Plant and Equipment [Line Items]                      
Long-lived assets, estimated fair value           $ 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] The Companies had no adjustments related to the following disclosure categories: foreign tax effects, effects of changes in tax law or rates enacted in the current period and effects of cross-border tax laws.
[6] Items designated are other segment items for each reportable segment.
[7] Items designated are other segment items for each reportable segment.
[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.
[9] 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.