v3.26.1
Operating Segments (Schedule of Segment Reporting Information, by Segment) (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
 [10]
Segment Reporting Information [Line Items]          
Operating Revenue $ 4,480 $ 3,810 $ 9,499 $ 7,886  
Electric fuel and other energy-related purchases 1,315 [1] 946 [1] 2,921 [2] 1,908 [2]  
Purchased electric capacity 80 [1] 18 [1] 149 [2] 27 [2]  
Purchased gas 53 [1] 43 [1] 196 [2] 190 [2]  
Other operations and maintenance 1,878 [1],[3] 933 [1],[3] 2,828 [2],[4] 1,877 [2],[4]  
Depreciation and amortization 615 [1] 580 [1] 1,246 [2] 1,162 [2]  
Other taxes 210 [1] 194 [1] 438 [2] 403 [2]  
Total operating expenses 4,151 2,714 7,778 5,567  
Interest and related charges 555 [1] 505 [1] 1,116 [2] 986 [2]  
Income tax expense (benefit) 122 [1] 220 [1] 170 [2],[5] 260 [2]  
Equity in earnings (losses) of equity method investees 0 [6] (1) [6] 0 [7] (8) [7]  
Other income (expense) 643 [6] 409 [6] 611 [7] 386 [7]  
Interest income 35 [6] 34 [6] 70 [7] 74 [7]  
Net Income (Loss) From Discontinued Operations Including Noncontrolling Interests [8] (1) 1 (2) 0  
Noncontrolling Interests (11) [6] 54 [6] 153 [7] 100 [7]  
Net Income 340 760 961 1,425  
Investment in equity method investees 127 [9]   127 [9]   $ 132
Capital expenditures     5,807 6,226  
Total assets 121,891   121,891   $ 115,857
Operating Segments          
Segment Reporting Information [Line Items]          
Total revenue from external customers 4,480 3,810 9,499 7,886  
Adjustments & Eliminations          
Segment Reporting Information [Line Items]          
Operating Revenue (393) (302) (799) (616)  
Electric fuel and other energy-related purchases (4) [1] (3) [1] (7) [2] (6) [2]  
Purchased electric capacity (1) [1] (1) [1] (1) [2] (1) [2]  
Purchased gas 0 [1] 0 [1] 0 [2] 0 [2]  
Other operations and maintenance (359) [1],[3] (295) [1],[3] (736) [2],[4] (603) [2],[4]  
Depreciation and amortization (12) [1] 0 [1] (24) [2] 0 [2]  
Other taxes (3) [1] (3) [1] (7) [2] (6) [2]  
Total operating expenses (379) (302) (775) (616)  
Interest and related charges (53) [1] (63) [1] (105) [2] (112) [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) 11 [6] 0 [6] 18 [7] 0 [7]  
Interest income (50) [6] (63) [6] (99) [7] (112) [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     (39) 0  
Total assets (7,000)   (7,000)    
Intersegment revenue          
Segment Reporting Information [Line Items]          
Operating Revenue 0 0 0 0  
Adjustments & Eliminations          
Segment Reporting Information [Line Items]          
Operating Revenue (393) (302) (799) (616)  
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 3,410 2,710 7,178 5,505  
Operating Revenue 3,421 2,712 7,186 5,506  
Electric fuel and other energy-related purchases 1,077 [1] 729 [1] 2,436 [2] 1,498 [2]  
Purchased electric capacity 78 [1] 17 [1] 143 [2] 24 [2]  
Purchased gas 0 [1] 0 [1] 0 [2] 0 [2]  
Other operations and maintenance 609 [1],[3] 531 [1],[3] 1,257 [2],[4] 1,090 [2],[4]  
Depreciation and amortization 417 [1] 396 [1] 838 [2] 793 [2]  
Other taxes 99 [1] 92 [1] 205 [2] 189 [2]  
Total operating expenses 2,280 1,765 4,879 3,594  
Interest and related charges 260 [1] 252 [1] 520 [2] 497 [2]  
Income tax expense (benefit) 151 [1] 110 [1] 330 [2] 243 [2]  
Equity in earnings (losses) of equity method investees 0 [6] 0 [6] 0 [7] 0 [7]  
Other income (expense) 48 [6] 39 [6] 90 [7] 74 [7]  
Interest income 4 [6] 5 [6] 10 [7] 12 [7]  
Net Income (Loss) From Discontinued Operations Including Noncontrolling Interests 0 0 0 0  
Noncontrolling Interests 112 [6] 80 [6] 217 [7] 148 [7]  
Net Income 670 549 1,340 1,110  
Investment in equity method investees [9] 0   0    
Capital expenditures     4,837 5,233  
Total assets 86,000   86,000    
Dominion Energy Virginia | Intersegment revenue          
Segment Reporting Information [Line Items]          
Operating Revenue 11 2 8 1  
Dominion Energy South Carolina | Operating Segments          
Segment Reporting Information [Line Items]          
Total revenue from external customers 876 833 1,865 1,782  
Operating Revenue 878 836 1,870 1,787  
Electric fuel and other energy-related purchases 220 [1] 199 [1] 423 [2] 366 [2]  
Purchased electric capacity 3 [1] 2 [1] 7 [2] 4 [2]  
Purchased gas 49 [1] 43 [1] 188 [2] 190 [2]  
Other operations and maintenance 169 [1],[3] 170 [1],[3] 347 [2],[4] 348 [2],[4]  
Depreciation and amortization 153 [1] 141 [1] 302 [2] 282 [2]  
Other taxes 83 [1] 75 [1] 168 [2] 154 [2]  
Total operating expenses 677 630 1,435 1,344  
Interest and related charges 73 [1] 70 [1] 145 [2] 141 [2]  
Income tax expense (benefit) 26 [1] 29 [1] 64 [2] 47 [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] 2 [6] 6 [7] 6 [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 105 109 231 261  
Investment in equity method investees [9] 0   0    
Capital expenditures     645 561  
Total assets 20,300   20,300    
Dominion Energy South Carolina | Intersegment revenue          
Segment Reporting Information [Line Items]          
Operating Revenue 2 3 5 5  
Contracted Energy | Operating Segments          
Segment Reporting Information [Line Items]          
Total revenue from external customers 256 240 601 544  
Operating Revenue 299 245 685 552  
Electric fuel and other energy-related purchases 28 [1] 21 [1] 62 [2] 50 [2]  
Purchased electric capacity 0 [1] 0 [1] 0 [2] 0 [2]  
Purchased gas 4 [1] 0 [1] 8 [2] 0 [2]  
Other operations and maintenance 201 [1],[3] 164 [1],[3] 362 [2],[4] 275 [2],[4]  
Depreciation and amortization 40 [1] 22 [1] 88 [2] 44 [2]  
Other taxes 16 [1] 15 [1] 33 [2] 30 [2]  
Total operating expenses 289 222 553 399  
Interest and related charges 27 [1] 8 [1] 52 [2] 16 [2]  
Income tax expense (benefit) (21) [1] 1 [1] (14) [2] 40 [2]  
Equity in earnings (losses) of equity method investees 0 [6] (1) [6] 0 [7] (1) [7]  
Other income (expense) (4) [6] (1) [6] (6) [7] (8) [7]  
Interest income 31 [6] 35 [6] 62 [7] 68 [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 31 47 150 156  
Investment in equity method investees [9] 92   92    
Capital expenditures     309 396  
Total assets 11,400   11,400    
Contracted Energy | Intersegment revenue          
Segment Reporting Information [Line Items]          
Operating Revenue 43 5 84 8  
Corporate and Other | Operating Segments          
Segment Reporting Information [Line Items]          
Total revenue from external customers (62) 27 (145) 55  
Operating Revenue 275 319 557 657  
Electric fuel and other energy-related purchases (6) [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 1,258 [1],[3] 363 [1],[3] 1,598 [2],[4] 767 [2],[4]  
Depreciation and amortization 17 [1] 21 [1] 42 [2] 43 [2]  
Other taxes 15 [1] 15 [1] 39 [2] 36 [2]  
Total operating expenses 1,284 399 1,686 846  
Interest and related charges 248 [1] 238 [1] 504 [2] 444 [2]  
Income tax expense (benefit) (34) [1] 80 [1] (210) [2] (70) [2]  
Equity in earnings (losses) of equity method investees (0) [6] 0 [6] 0 [7] (7) [7]  
Other income (expense) 588 [6] 371 [6] 510 [7] 320 [7]  
Interest income 47 [6] 55 [6] 91 [7] 100 [7]  
Net Income (Loss) From Discontinued Operations Including Noncontrolling Interests (1) 1 (2) 0  
Noncontrolling Interests (123) [6] (26) [6] (64) [7] (48) [7]  
Net Income (466) 55 (760) (102)  
Investment in equity method investees [9] 35   35    
Capital expenditures     55 36  
Total assets 11,200   11,200    
Corporate and Other | Intersegment revenue          
Segment Reporting Information [Line Items]          
Operating Revenue $ 337 $ 292 $ 702 $ 602  
[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 $— million and $(3) million for the three months ended June 30, 2026 and 2025, respectively, and $— million and $(3) million for six months ended June 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.