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Operating Segments - Virginia Power (Narrative) (Detail) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]    
Gain (loss) on investments $ 442 $ 589
Virginia Electric and Power Company    
Segment Reporting Information [Line Items]    
Gain (loss) on investments 65 85
Operating Segments    
Segment Reporting Information [Line Items]    
After- tax net benefits (expenses) 81 76
Gain (loss) on investments 415 515
Gain (loss) on investments, after tax 255 $ 323
Investment, Type [Extensible Enumeration]   Nuclear Decommissioning Trust Fund [Member]
Operating Segments | Corporate and Other    
Segment Reporting Information [Line Items]    
After- tax net benefits (expenses) (108) $ (272)
After- tax net benefits (expenses) for specific items 58 12
Operating Segments | Virginia Electric and Power Company    
Segment Reporting Information [Line Items]    
Loss associated with severe weather events 106  
Loss associated with severe weather events, after-tax 79  
Share of costs not expected to be recovered from customers on the CVOW commercial project 112  
Share of costs not expected to be recovered from customers on the CVOW commercial project, after tax 84  
Gain (loss) on investments 59 74
Gain (loss) on investments, after tax $ 34 $ 45
Investment, Type [Extensible Enumeration] Nuclear Decommissioning Trust Fund [Member] Nuclear Decommissioning Trust Fund [Member]
Charge related to write-off of certain early stage development costs   $ 30
Charge related to write-off of certain early stage development costs after tax   22
Operating Segments | Virginia Electric and Power Company | Corporate and Other    
Segment Reporting Information [Line Items]    
After- tax net benefits (expenses) $ (101) 17
After- tax net benefits (expenses) for specific items $ (127) $ 15