v3.26.3
Operating Segments (Schedule of Segment Reporting Information, by Segment) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
 [10]
Segment Reporting Information [Line Items]          
Operating Revenue $ 5,617 $ 4,527 $ 15,116 $ 12,413  
Electric fuel and other energy-related purchases 1,603 [1] 1,337 [1] 4,524 [2] 3,245 [2]  
Purchased electric capacity 106 [1] 36 [1] 255 [2] 63 [2]  
Purchased gas 40 [1] 31 [1] 236 [2] 221 [2]  
Other operations and maintenance 1,089 [1],[3] 980 [1],[3] 3,917 [2],[4] 2,857 [2],[4]  
Depreciation and amortization 722 [1] 609 [1] 1,968 [2] 1,771 [2]  
Other taxes 215 [1] 195 [1] 653 [2] 598 [2]  
Total operating expenses 3,775 3,188 11,553 8,755  
Interest and related charges 623 [1] 527 [1] 1,739 [2] 1,513 [2]  
Income tax expense (benefit) 215 [1] 216 [1] 385 [2],[5] 476 [2]  
Equity in earnings (losses) of equity method investees 2 [6] (0) [6] 2 [7] (8) [7]  
Other income (expense) 229 [6] 406 [6] 840 [7] 792 [7]  
Interest income 40 [6] 26 [6] 110 [7] 100 [7]  
Net Income (Loss) From Discontinued Operations Including Noncontrolling Interests [8] (1) 0 (3) 0  
Noncontrolling Interests 114 [6] 22 [6] 267 [7] 122 [7]  
Net Income 1,160 1,006 2,121 2,431  
Investment in equity method investees 123 [9]   123 [9]   $ 132
Capital expenditures     8,593 9,267  
Total assets 124,784   124,784   $ 115,857
Operating Segments          
Segment Reporting Information [Line Items]          
Total revenue from external customers 5,617 4,527 15,116 12,413  
Adjustments & Eliminations          
Segment Reporting Information [Line Items]          
Operating Revenue (387) (307) (1,186) (923)  
Electric fuel and other energy-related purchases (4) [1] (4) [1] (11) [2] (10) [2]  
Purchased electric capacity (2) [1] (1) [1] (3) [2] (2) [2]  
Purchased gas 0 [1] 0 [1] 0 [2] 0 [2]  
Other operations and maintenance (365) [1],[3] (300) [1],[3] (1,101) [2],[4] (903) [2],[4]  
Depreciation and amortization (12) [1] 0 [1] (36) [2] 0 [2]  
Other taxes (3) [1] (2) [1] (10) [2] (8) [2]  
Total operating expenses (386) (307) (1,161) (923)  
Interest and related charges (48) [1] (43) [1] (153) [2] (155) [2]  
Income tax expense (benefit) 0 [1] 0 [1] 0 [2] 0 [2]  
Equity in earnings (losses) of equity method investees 0 [6] 0 [6] 0 [7] 0 [7]  
Other income (expense) 0 [6] 0 [6] 18 [7] 0 [7]  
Interest income (47) [6] (43) [6] (146) [7] (155) [7]  
Net Income (Loss) From Discontinued Operations Including Noncontrolling Interests 0 0 0 0  
Noncontrolling Interests 0 [6] 0 [6] 0 [7] 0 [7]  
Net Income 0 0 0 0  
Investment in equity method investees [9] 0   0    
Capital expenditures     (63) 2  
Total assets (5,000)   (5,000)    
Intersegment revenue          
Segment Reporting Information [Line Items]          
Operating Revenue 0 0 0 0  
Adjustments & Eliminations          
Segment Reporting Information [Line Items]          
Operating Revenue (387) (307) (1,186) (923)  
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 4,214 3,313 11,392 8,818  
Operating Revenue 4,218 3,311 11,404 8,817  
Electric fuel and other energy-related purchases 1,296 [1] 1,071 [1] 3,732 [2] 2,569 [2]  
Purchased electric capacity 103 [1] 32 [1] 246 [2] 56 [2]  
Purchased gas 0 [1] 0 [1] 0 [2] 0 [2]  
Other operations and maintenance 744 [1],[3] 581 [1],[3] 2,001 [2],[4] 1,671 [2],[4]  
Depreciation and amortization 509 [1] 415 [1] 1,347 [2] 1,208 [2]  
Other taxes 104 [1] 92 [1] 309 [2] 281 [2]  
Total operating expenses 2,756 2,191 7,635 5,785  
Interest and related charges 312 [1] 236 [1] 832 [2] 733 [2]  
Income tax expense (benefit) 232 [1] 169 [1] 562 [2] 412 [2]  
Equity in earnings (losses) of equity method investees 0 [6] 0 [6] 0 [7] 0 [7]  
Other income (expense) 48 [6] 45 [6] 138 [7] 119 [7]  
Interest income 10 [6] 5 [6] 20 [7] 17 [7]  
Net Income (Loss) From Discontinued Operations Including Noncontrolling Interests 0 0 0 0  
Noncontrolling Interests 114 [6] 86 [6] 331 [7] 234 [7]  
Net Income 862 679 2,202 1,789  
Investment in equity method investees [9] 0   0    
Capital expenditures     7,163 7,695  
Total assets 88,200   88,200    
Dominion Energy Virginia | Intersegment revenue          
Segment Reporting Information [Line Items]          
Operating Revenue 4 (2) 12 (1)  
Dominion Energy South Carolina | Operating Segments          
Segment Reporting Information [Line Items]          
Total revenue from external customers 1,111 942 2,976 2,724  
Operating Revenue 1,114 945 2,984 2,732  
Electric fuel and other energy-related purchases 277 [1] 239 [1] 700 [2] 605 [2]  
Purchased electric capacity 5 [1] 5 [1] 12 [2] 9 [2]  
Purchased gas 35 [1] 30 [1] 223 [2] 220 [2]  
Other operations and maintenance 183 [1],[3] 168 [1],[3] 530 [2],[4] 516 [2],[4]  
Depreciation and amortization 163 [1] 141 [1] 465 [2] 423 [2]  
Other taxes 83 [1] 77 [1] 251 [2] 231 [2]  
Total operating expenses 746 660 2,181 2,004  
Interest and related charges 76 [1] 69 [1] 221 [2] 210 [2]  
Income tax expense (benefit) 65 [1] 53 [1] 129 [2] 100 [2]  
Equity in earnings (losses) of equity method investees 0 [6] 0 [6] 0 [7] 0 [7]  
Other income (expense) 0 [6] 0 [6] (1) [7] 0 [7]  
Interest income 3 [6] 5 [6] 9 [7] 11 [7]  
Net Income (Loss) From Discontinued Operations Including Noncontrolling Interests 0 0 0 0  
Noncontrolling Interests 0 [6] 0 [6] 0 [7] 0 [7]  
Net Income 230 168 461 429  
Investment in equity method investees [9] 0   0    
Capital expenditures     984 832  
Total assets 20,500   20,500    
Dominion Energy South Carolina | Intersegment revenue          
Segment Reporting Information [Line Items]          
Operating Revenue 3 3 8 8  
Contracted Energy | Operating Segments          
Segment Reporting Information [Line Items]          
Total revenue from external customers 302 290 903 834  
Operating Revenue 337 297 1,022 849  
Electric fuel and other energy-related purchases 34 [1] 31 [1] 96 [2] 81 [2]  
Purchased electric capacity 0 [1] 0 [1] 0 [2] 0 [2]  
Purchased gas 5 [1] 1 [1] 13 [2] 1 [2]  
Other operations and maintenance 153 [1],[3] 103 [1],[3] 515 [2],[4] 378 [2],[4]  
Depreciation and amortization 40 [1] 30 [1] 128 [2] 74 [2]  
Other taxes 16 [1] 15 [1] 49 [2] 45 [2]  
Total operating expenses 248 180 801 579  
Interest and related charges 24 [1] 15 [1] 76 [2] 31 [2]  
Income tax expense (benefit) (41) [1] (33) [1] (55) [2] 7 [2]  
Equity in earnings (losses) of equity method investees 0 [6] 1 [6] 0 [7] (0) [7]  
Other income (expense) (3) [6] 7 [6] (9) [7] (1) [7]  
Interest income 31 [6] 22 [6] 93 [7] 90 [7]  
Net Income (Loss) From Discontinued Operations Including Noncontrolling Interests 0 0 0 0  
Noncontrolling Interests 0 [6] 0 [6] 0 [7] 0 [7]  
Net Income 134 165 284 321  
Investment in equity method investees [9] 87   87    
Capital expenditures     435 682  
Total assets 11,100   11,100    
Contracted Energy | Intersegment revenue          
Segment Reporting Information [Line Items]          
Operating Revenue 35 7 119 15  
Corporate and Other | Operating Segments          
Segment Reporting Information [Line Items]          
Total revenue from external customers (10) (18) (155) 37  
Operating Revenue 335 281 892 938  
Electric fuel and other energy-related purchases (0) [1] 0 [1] 7 [2] 0 [2]  
Purchased electric capacity 0 [1] 0 [1] 0 [2] 0 [2]  
Purchased gas 0 [1] 0 [1] 0 [2] 0 [2]  
Other operations and maintenance 374 [1],[3] 428 [1],[3] 1,972 [2],[4] 1,195 [2],[4]  
Depreciation and amortization 22 [1] 23 [1] 64 [2] 66 [2]  
Other taxes 15 [1] 13 [1] 54 [2] 49 [2]  
Total operating expenses 411 464 2,097 1,310  
Interest and related charges 259 [1] 250 [1] 763 [2] 694 [2]  
Income tax expense (benefit) (41) [1] 27 [1] (251) [2] (43) [2]  
Equity in earnings (losses) of equity method investees 2 [6] (1) [6] 2 [7] (8) [7]  
Other income (expense) 184 [6] 354 [6] 694 [7] 674 [7]  
Interest income 43 [6] 37 [6] 134 [7] 137 [7]  
Net Income (Loss) From Discontinued Operations Including Noncontrolling Interests (1) 0 (3) 0  
Noncontrolling Interests 0 [6] (64) [6] (64) [7] (112) [7]  
Net Income (66) (6) (826) (108)  
Investment in equity method investees [9] 36   36    
Capital expenditures     74 56  
Total assets 10,000   10,000    
Corporate and Other | Intersegment revenue          
Segment Reporting Information [Line Items]          
Operating Revenue $ 345 $ 299 $ 1,047 $ 901  
[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 (benefits).
[4] Includes impairment of assets and other charges (benefits).
[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] Includes income tax expense (benefit) of $(1) million and $(2) million for the three months ended September 30, 2026 and 2025, respectively, and $(1) million and $(5) million for the nine months ended September 30, 2026 and 2025 respectively.
[9] Excludes liability to Atlantic Coast Pipeline.
[10] Dominion Energy’s Consolidated Balance Sheet at December 31, 2025 has been derived from the audited Consolidated Balance Sheet at that date.