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Operating Segments (Schedule of Segment Reporting Information, by Segment, Virginia Power) (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]      
Operating Revenue $ 4,076 $ 3,632  
Electric fuel and other energy-related purchases [1] 962 959  
Purchased electric capacity [1] 9 12  
Other operations and maintenance [1],[2] 944 885  
Depreciation and amortization [1] 582 621  
Other taxes [1] 209 202  
Total operating expenses 2,853 2,799  
Interest and related charges [1] 480 574  
Income tax expense (benefit) [1] 55 55  
Other income (expense) [3] (23) 66  
Interest income [3] 35 53  
Noncontrolling Interests 46 0  
Net Income (Loss) 646 441  
Capital expenditures 3,214 2,930  
Total assets 104,555   $ 102,415 [4]
Virginia Electric and Power Company      
Segment Reporting Information [Line Items]      
Operating Revenue [5] 2,765 [6] 2,489  
Electric fuel and other energy-related purchases [5],[6] 769 701  
Purchased electric capacity [6] 7 13  
Other operations and maintenance [6],[7] 656 514  
Depreciation and amortization [6] 398 448  
Other taxes [6] 97 93  
Total operating expenses 1,927 1,769  
Interest and related charges [5],[6] 243 190  
Income tax expense (benefit) [6] 92 128  
Other income (expense) [8] 19 50  
Interest income [8] 6 13  
Noncontrolling Interests 46 0  
Net Income (Loss) 482 465  
Capital expenditures 2,724 2,102  
Total assets 70,303   $ 68,387 [9]
Dominion Energy Virginia | Virginia Electric and Power Company      
Segment Reporting Information [Line Items]      
Operating Revenue 2,794 [6] 2,489  
Electric fuel and other energy-related purchases [6] 769 701  
Purchased electric capacity [6] 7 13  
Other operations and maintenance [6],[7] 559 533  
Depreciation and amortization [6] 397 445  
Other taxes [6] 97 93  
Total operating expenses 1,829 1,785  
Interest and related charges [6] 245 192  
Income tax expense (benefit) [6] 132 116  
Other income (expense) [8] 35 21  
Interest income [8] 6 7  
Noncontrolling Interests 68    
Net Income (Loss) 561 424  
Capital expenditures 2,724 2,102  
Total assets 70,300    
Corporate and Other | Virginia Electric and Power Company      
Segment Reporting Information [Line Items]      
Operating Revenue (29) [6] 0  
Electric fuel and other energy-related purchases [6] 0 0  
Purchased electric capacity [6] 0 0  
Other operations and maintenance [6],[7] 97 (19)  
Depreciation and amortization [6] 1 3  
Other taxes [6] 0 0  
Total operating expenses 98 (16)  
Interest and related charges [6] (2) (2)  
Income tax expense (benefit) [6] (40) 12  
Other income (expense) [8] (16) 29  
Interest income [8] 0 6  
Noncontrolling Interests (22)    
Net Income (Loss) (79) 41  
Capital expenditures 0 $ 0  
Total assets $ 0    
[1] 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.
[2] Includes impairment of assets and other charges (benefits).
[3] Items designated are other segment items for each reportable segment.
[4] Dominion Energy’s Consolidated Balance Sheet at December 31, 2024 has been derived from the audited Consolidated Balance Sheet at that date.
[5] See Note 19 for amounts attributable to affiliates.
[6] 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.
[7] Includes impairment of assets and other charges (benefits).
[8] Items designated are other segment items for each reportable segment.
[9] Virginia Power’s Consolidated Balance Sheet at December 31, 2024 has been derived from the audited Consolidated Balance Sheet at that date.