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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting Information [Line Items]        
Operating Revenue $ 3,941 $ 3,810 $ 11,059 $ 10,859
Net Income from discontinued operations including noncontrolling interest [1] (13) (541) 182 (92)
Net income (loss) attributable to Dominion Energy 954 157 2,200 1,721
Operating Segments        
Segment Reporting Information [Line Items]        
Total revenue from external customers 3,941 3,810 11,059 10,859
Adjustments & Eliminations        
Segment Reporting Information [Line Items]        
Net Income from discontinued operations including noncontrolling interest 0 0 0 0
Net income (loss) attributable to Dominion Energy 0 0 0 0
Intersegment revenue        
Segment Reporting Information [Line Items]        
Operating Revenue 0 0 0 0
Adjustments & Eliminations        
Segment Reporting Information [Line Items]        
Operating Revenue (260) (235) (761) (707)
Eliminations        
Segment Reporting Information [Line Items]        
Total revenue from external customers 0 0 0 0
Operating Revenue (260) (235) (761) (707)
Dominion Energy Virginia | Operating Segments        
Segment Reporting Information [Line Items]        
Total revenue from external customers 2,760 2,649 7,786 7,286
Operating Revenue 2,762 2,645 7,788 7,281
Net Income from discontinued operations including noncontrolling interest 0 0 0 0
Net income (loss) attributable to Dominion Energy 662 535 1,571 1,315
Dominion Energy Virginia | Intersegment revenue        
Segment Reporting Information [Line Items]        
Operating Revenue 2 (4) 2 (5)
Dominion Energy South Carolina | Operating Segments        
Segment Reporting Information [Line Items]        
Total revenue from external customers 846 944 2,496 2,559
Operating Revenue 848 945 2,503 2,563
Net Income from discontinued operations including noncontrolling interest 0 0 0 0
Net income (loss) attributable to Dominion Energy 147 143 296 302
Dominion Energy South Carolina | Intersegment revenue        
Segment Reporting Information [Line Items]        
Operating Revenue 2 1 7 4
Contracted Energy | Operating Segments        
Segment Reporting Information [Line Items]        
Total revenue from external customers 256 225 843 659
Operating Revenue 260 231 852 673
Net Income from discontinued operations including noncontrolling interest 0 0 0 0
Net income (loss) attributable to Dominion Energy 83 52 305 118
Contracted Energy | Intersegment revenue        
Segment Reporting Information [Line Items]        
Operating Revenue 4 6 9 14
Corporate and Other | Operating Segments        
Segment Reporting Information [Line Items]        
Total revenue from external customers 79 (8) (66) 355
Operating Revenue 331 224 677 1,049
Net Income from discontinued operations including noncontrolling interest (13) (541) 182 (92)
Net income (loss) attributable to Dominion Energy 62 (573) 28 (14)
Corporate and Other | Intersegment revenue        
Segment Reporting Information [Line Items]        
Operating Revenue $ 252 $ 232 $ 743 $ 694
[1] Includes income tax expense (benefit) of $(10) million and $1.2 billion for the three months ended September 30, 2024 and 2023, respectively, and $22 million and $1.3 billion for the nine months ended September 30, 2024 and 2023, respectively.