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Operating Segments (Schedule of Segment Reporting Information, by Segment) (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
 [9]
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]  
Purchased gas 31 [1] 34 [1] 221 [2] 198 [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]  
Equity in earnings (losses) of equity method investees 0 [5] 1 [5] (8) [6] 0 [6]  
Other income (expense) 406 [5] 312 [5] 792 [6] 608 [6]  
Interest income 26 [5] 35 [5] 100 [6] 106 [6]  
Net Income (Loss) From Discontinued Operations Including Noncontrolling Interests [7] 0 (15) 0 200  
Noncontrolling Interests 22 [5] 0 122 [6] 0  
Net income (loss) attributable to Dominion Energy 1,006 934 2,431 1,900  
Investment in equity method investees 138 [8]   138 [8]   $ 138
Capital expenditures     9,267 8,921  
Total assets 111,597   111,597   $ 102,415
Operating Segments          
Segment Reporting Information [Line Items]          
Total revenue from external customers 4,527 3,941 12,413 11,059  
Adjustments & Eliminations          
Segment Reporting Information [Line Items]          
Operating Revenue (307) (260) (923) (761)  
Electric fuel and other energy-related purchases (4) [1] (2) [1] (10) [2] (6) [2]  
Purchased electric capacity (1) [1] (1) [1] (2) [2] (2) [2]  
Purchased gas 0 [1] 0 [1] 0 [2] 0 [2]  
Other operations and maintenance (300) [1],[3] (255) [1],[3] (903) [2],[4] (747) [2],[4]  
Depreciation and amortization 0 [1] 0 [1] 0 [2] 0 [2]  
Other taxes (2) [1] (2) [1] (8) [2] (6) [2]  
Total operating expenses (307) (260) (923) (761)  
Interest and related charges (43) [1] (59) [1] (155) [2] (139) [2]  
Income tax expense (benefit) 0 [1] 0 [1] 0 [2] 0 [2]  
Equity in earnings (losses) of equity method investees 0 [5] 0 [5] 0 [6] 0 [6]  
Other income (expense) 0 [5] 0 [5] 0 [6] 0 [6]  
Interest income (43) [5] (59) [5] (155) [6] (139) [6]  
Net Income (Loss) From Discontinued Operations Including Noncontrolling Interests 0 0 0 0  
Noncontrolling Interests 0 [5]   0 [6]    
Net income (loss) attributable to Dominion Energy 0 0 0 0  
Investment in equity method investees [8] 0   0    
Capital expenditures     2 0  
Total assets (5,200)   (5,200)    
Intersegment revenue          
Segment Reporting Information [Line Items]          
Operating Revenue 0 0 0 0  
Adjustments & Eliminations          
Segment Reporting Information [Line Items]          
Operating Revenue (307) (260) (923) (761)  
Eliminations          
Segment Reporting Information [Line Items]          
Total revenue from external customers 0 0 0 0  
Dominion Energy Virginia | Operating Segments          
Segment Reporting Information [Line Items]          
Total revenue from external customers 3,313 2,760 8,818 7,786  
Operating Revenue 3,311 2,762 8,817 7,788  
Electric fuel and other energy-related purchases 1,071 [1] 690 [1] 2,569 [2] 2,098 [2]  
Purchased electric capacity 32 [1] 24 [1] 56 [2] 53 [2]  
Purchased gas 0 [1] 0 [1] 0 [2] 0 [2]  
Other operations and maintenance 581 [1],[3] 574 [1],[3] 1,671 [2],[4] 1,629 [2],[4]  
Depreciation and amortization 415 [1] 374 [1] 1,208 [2] 1,263 [2]  
Other taxes 92 [1] 83 [1] 281 [2] 247 [2]  
Total operating expenses 2,191 1,745 5,785 5,290  
Interest and related charges 236 [1] 241 [1] 733 [2] 639 [2]  
Income tax expense (benefit) 169 [1] 148 [1] 412 [2] 382 [2]  
Equity in earnings (losses) of equity method investees 0 [5] 0 [5] 0 [6] 0 [6]  
Other income (expense) 45 [5] 27 [5] 119 [6] 77 [6]  
Interest income 5 [5] 7 [5] 17 [6] 17 [6]  
Net Income (Loss) From Discontinued Operations Including Noncontrolling Interests 0 0 0 0  
Noncontrolling Interests 86 [5]   234 [6]    
Net income (loss) attributable to Dominion Energy 679 662 1,789 1,571  
Investment in equity method investees [8] 0   0    
Capital expenditures     7,695 7,034  
Total assets 77,400   77,400    
Dominion Energy Virginia | Intersegment revenue          
Segment Reporting Information [Line Items]          
Operating Revenue (2) 2 (1) 2  
Dominion Energy South Carolina | Operating Segments          
Segment Reporting Information [Line Items]          
Total revenue from external customers 942 846 2,724 2,496  
Operating Revenue 945 848 2,732 2,503  
Electric fuel and other energy-related purchases 239 [1] 198 [1] 605 [2] 617 [2]  
Purchased electric capacity 5 [1] 2 [1] 9 [2] 6 [2]  
Purchased gas 30 [1] 34 [1] 220 [2] 198 [2]  
Other operations and maintenance 168 [1],[3] 167 [1],[3] 516 [2],[4] 503 [2],[4]  
Depreciation and amortization 141 [1] 136 [1] 423 [2] 408 [2]  
Other taxes 77 [1] 77 [1] 231 [2] 226 [2]  
Total operating expenses 660 614 2,004 1,958  
Interest and related charges 69 [1] 70 [1] 210 [2] 203 [2]  
Income tax expense (benefit) 53 [1] 20 [1] 100 [2] 52 [2]  
Equity in earnings (losses) of equity method investees 0 [5] 0 [5] 0 [6] 0 [6]  
Other income (expense) 0 [5] 1 [5] 0 [6] 1 [6]  
Interest income 5 [5] 2 [5] 11 [6] 5 [6]  
Net Income (Loss) From Discontinued Operations Including Noncontrolling Interests 0 0 0 0  
Noncontrolling Interests 0 [5]   0 [6]    
Net income (loss) attributable to Dominion Energy 168 147 429 296  
Investment in equity method investees [8] 0   0    
Capital expenditures     832 767  
Total assets 18,900   18,900    
Dominion Energy South Carolina | Intersegment revenue          
Segment Reporting Information [Line Items]          
Operating Revenue 3 2 8 7  
Contracted Energy | Operating Segments          
Segment Reporting Information [Line Items]          
Total revenue from external customers 290 256 834 843  
Operating Revenue 297 260 849 852  
Electric fuel and other energy-related purchases 31 [1] 24 [1] 81 [2] 78 [2]  
Purchased electric capacity 0 [1] 0 [1] 0 [2] 0 [2]  
Purchased gas 1 [1] 0 [1] 1 [2] 0 [2]  
Other operations and maintenance 103 [1],[3] 117 [1],[3] 378 [2],[4] 329 [2],[4]  
Depreciation and amortization 30 [1] 19 [1] 74 [2] 56 [2]  
Other taxes 15 [1] 13 [1] 45 [2] 40 [2]  
Total operating expenses 180 173 579 503  
Interest and related charges 15 [1] 8 [1] 31 [2] 28 [2]  
Income tax expense (benefit) (33) [1] 28 [1] 7 [2] 103 [2]  
Equity in earnings (losses) of equity method investees 1 [5] 4 [5] 0 [6] 3 [6]  
Other income (expense) 7 [5] (5) [5] (1) [6] (12) [6]  
Interest income 22 [5] 33 [5] 90 [6] 96 [6]  
Net Income (Loss) From Discontinued Operations Including Noncontrolling Interests 0 0 0 0  
Noncontrolling Interests 0 [5]   0 [6]    
Net income (loss) attributable to Dominion Energy 165 83 321 305  
Investment in equity method investees [8] 98   98    
Capital expenditures     682 572  
Total assets 11,500   11,500    
Contracted Energy | Intersegment revenue          
Segment Reporting Information [Line Items]          
Operating Revenue 7 4 15 9  
Corporate and Other | Operating Segments          
Segment Reporting Information [Line Items]          
Total revenue from external customers (18) 79 37 (66)  
Operating Revenue 281 331 938 677  
Electric fuel and other energy-related purchases 0 [1] 0 [1] 0 [2] 0 [2]  
Purchased electric capacity 0 [1] (1) [1] 0 [2] 0 [2]  
Purchased gas 0 [1] 0 [1] 0 [2] 0 [2]  
Other operations and maintenance 428 [1],[3] 419 [1],[3] 1,195 [2],[4] 1,100 [2],[4]  
Depreciation and amortization 23 [1] 20 [1] 66 [2] 64 [2]  
Other taxes 13 [1] 13 [1] 49 [2] 49 [2]  
Total operating expenses 464 451 1,310 1,213  
Interest and related charges 250 [1] 144 [1] 694 [2] 718 [2]  
Income tax expense (benefit) 27 [1] 17 [1] (43) [2] (116) [2]  
Equity in earnings (losses) of equity method investees (1) [5] (3) [5] (8) [6] (3) [6]  
Other income (expense) 354 [5] 289 [5] 674 [6] 542 [6]  
Interest income 37 [5] 52 [5] 137 [6] 127 [6]  
Net Income (Loss) From Discontinued Operations Including Noncontrolling Interests 0 (15) 0 200  
Noncontrolling Interests (64) [5]   (112) [6]    
Net income (loss) attributable to Dominion Energy (6) 42 (108) (272)  
Investment in equity method investees [8] 40   40    
Capital expenditures     56 548  
Total assets 9,000   9,000    
Corporate and Other | Intersegment revenue          
Segment Reporting Information [Line Items]          
Operating Revenue $ 299 $ 252 $ 901 $ 743  
[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] Includes income tax expense (benefit) of $(2) million and $(9) million for the three months ended September 30, 2025 and 2024, respectively, and $(5) million and $31 million for the nine months ended September 30, 2025 and 2024, respectively.
[8] Excludes liability to Atlantic Coast Pipeline.
[9] Dominion Energy’s Consolidated Balance Sheet at December 31, 2024 has been derived from the audited Consolidated Balance Sheet at that date.