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Operating Segments (Schedule of Segment Reporting Information, by Segment, Virginia Power) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]          
Operating Revenue $ 4,527 $ 3,941 $ 12,413 $ 11,059  
Electric fuel and other energy-related purchases 1,337 [1] 910 [1] 3,245 [2] 2,787 [2]  
Purchased electric capacity 36 [1] 24 [1] 63 [2] 57 [2]  
Other operations and maintenance 980 [1],[3] 1,022 [1],[3] 2,857 [2],[4] 2,814 [2],[4]  
Depreciation and amortization 609 [1] 549 [1] 1,771 [2] 1,791 [2]  
Other taxes 195 [1] 184 [1] 598 [2] 556 [2]  
Total operating expenses 3,188 2,723 8,755 8,203  
Interest and related charges 527 [1] 404 [1] 1,513 [2] 1,449 [2]  
Income tax expense (benefit) 216 [1] 213 [1] 476 [2] 421 [2]  
Other income (expense) 406 [5] 312 [5] 792 [6] 608 [6]  
Interest income 26 [5] 35 [5] 100 [6] 106 [6]  
Noncontrolling Interests 22 [5] 0 122 [6] 0  
Net Income (Loss) 1,006 934 2,431 1,900  
Capital expenditures     9,267 8,921  
Total assets 111,597   111,597   $ 102,415 [7]
Virginia Electric and Power Company          
Segment Reporting Information [Line Items]          
Operating Revenue [8] 3,311 2,762 8,788 7,788  
Electric fuel and other energy-related purchases [8] 1,071 [9] 690 [9] 2,569 [10] 2,098 [10]  
Purchased electric capacity 32 [9] 24 [9] 56 [10] 53 [10]  
Other operations and maintenance 706 [9],[11] 614 [9],[11] 1,965 [10],[12] 1,663 [10],[12]  
Depreciation and amortization 418 [9] 375 [9] 1,212 [10] 1,268 [10]  
Other taxes 93 [9] 83 [9] 282 [10] 248 [10]  
Total operating expenses 2,320 1,786 6,084 5,330  
Interest and related charges [8] 235 [9] 239 [9] 729 [10] 633 [10]  
Income tax expense (benefit) 151 [9] 146 [9] 356 [10] 399 [10]  
Other income (expense) 79 [13] 52 [13] 173 [14] 139 [14]  
Interest income 6 [13] 7 [13] 18 [14] 23 [14]  
Noncontrolling Interests 22 [13] 0 122 [14] 0  
Net Income (Loss) 668 650 1,688 1,588  
Capital expenditures     7,690 7,034  
Total assets 75,905   75,905   $ 68,387 [15]
Dominion Energy Virginia | Virginia Electric and Power Company          
Segment Reporting Information [Line Items]          
Operating Revenue 3,311 2,762 8,817 7,788  
Electric fuel and other energy-related purchases 1,071 [9] 690 [9] 2,569 [10] 2,098 [10]  
Purchased electric capacity 32 [9] 24 [9] 56 [10] 53 [10]  
Other operations and maintenance 581 [9],[11] 574 [9],[11] 1,671 [10],[12] 1,629 [10],[12]  
Depreciation and amortization 415 [9] 374 [9] 1,208 [10] 1,263 [10]  
Other taxes 92 [9] 83 [9] 281 [10] 247 [10]  
Total operating expenses 2,191 1,745 5,785 5,290  
Interest and related charges 236 [9] 241 [9] 733 [10] 639 [10]  
Income tax expense (benefit) 169 [9] 148 [9] 412 [10] 382 [10]  
Other income (expense) 45 [13] 27 [13] 119 [14] 77 [14]  
Interest income 5 [13] 7 [13] 17 [14] 17 [14]  
Noncontrolling Interests 86 [13]   234 [14]    
Net Income (Loss) 679 662 1,789 1,571  
Capital expenditures     7,690 7,034  
Total assets 75,900   75,900    
Corporate and Other | Virginia Electric and Power Company          
Segment Reporting Information [Line Items]          
Operating Revenue 0 0 (29) 0  
Electric fuel and other energy-related purchases 0 [9] 0 [9] 0 [10] 0 [10]  
Purchased electric capacity 0 [9] 0 [9] 0 [10] 0 [10]  
Other operations and maintenance 125 [9],[11] 40 [9],[11] 294 [10],[12] 34 [10],[12]  
Depreciation and amortization 3 [9] 1 [9] 4 [10] 5 [10]  
Other taxes 1 [9] 0 [9] 1 [10] 1 [10]  
Total operating expenses 129 41 299 40  
Interest and related charges (1) [9] (2) [9] (4) [10] (6) [10]  
Income tax expense (benefit) (18) [9] (2) [9] (56) [10] 17 [10]  
Other income (expense) 34 [13] 25 [13] 54 [14] 62 [14]  
Interest income 1 [13] 0 [13] 1 [14] 6 [14]  
Noncontrolling Interests (64) [13]   (112) [14]    
Net Income (Loss) (11) $ (12) (101) 17  
Capital expenditures     0 $ 0  
Total assets $ 0   $ 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] 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.
[3] Includes impairment of assets and other charges.
[4] Includes impairment of assets and other charges.
[5] Items designated are other segment items for each reportable segment.
[6] Items designated are other segment items for each reportable segment.
[7] Dominion Energy’s Consolidated Balance Sheet at December 31, 2024 has been derived from the audited Consolidated Balance Sheet at that date.
[8] See Note 19 for amounts attributable to affiliates.
[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.
[10] 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.
[11] Includes impairment of assets and other charges.
[12] Includes impairment of assets and other charges.
[13] Items designated are other segment items for each reportable segment.
[14] Items designated are other segment items for each reportable segment.
[15] Virginia Power’s Consolidated Balance Sheet at December 31, 2024 has been derived from the audited Consolidated Balance Sheet at that date.