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Operating Segments - Virginia Power (Narrative) (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Segment Reporting Information [Line Items]        
Gain (loss) on investments     $ 308 $ (556)
Virginia Electric and Power Company        
Segment Reporting Information [Line Items]        
Gain (loss) on investments     45 (75)
Charge for the write-off of certain previously deferred amounts $ 38 $ 409 45 413
Deferred amounts related to certain riders | Virginia Electric and Power Company        
Segment Reporting Information [Line Items]        
Charge for the write-off of certain previously deferred amounts 36      
Charge for the write-off of certain previously deferred amounts, after tax $ 27      
Operating Segments        
Segment Reporting Information [Line Items]        
After- tax net benefits (expenses)     364 (1,500)
Operating Segments | Nuclear Decommissioning Trust Funds        
Segment Reporting Information [Line Items]        
Gain (loss) on investments     281 (579)
Gain (loss) on investments, after tax     208 (450)
Operating Segments | Corporate and Other        
Segment Reporting Information [Line Items]        
After- tax net benefits (expenses)     112 (1,500)
After- tax net benefits (expenses) for specific items     279 (1,400)
Operating Segments | Virginia Electric and Power Company        
Segment Reporting Information [Line Items]        
After- tax net benefits (expenses)       (527)
Charge associated with storm damage and service restoration       94
Charge associated with storm damage and service restoration, after tax       70
Charge for amortization of a regulatory asset, 2021 Triennial Review     122 122
Charge for amortization of a regulatory asset, 2021 Triennial Review, after tax     91 91
Charge in connection with comprehensive settlement agreement for fuel expenses       191
Charge in connection with comprehensive settlement agreement for fuel expenses, after-tax       142
Charge for RGGI compliance cost       180
Charge for RGGI compliance cost, after tax       134
Charges for Dismantling cost       42
Charges for Dismantling cost, after tax       31
Operating Segments | Virginia Electric and Power Company | Nuclear Decommissioning Trust Funds        
Segment Reporting Information [Line Items]        
Gain (loss) on investments     41 (78)
Gain (loss) on investments, after tax     30 (58)
Operating Segments | Virginia Electric and Power Company | Corporate and Other        
Segment Reporting Information [Line Items]        
After- tax net benefits (expenses)     (91) (554)
After- tax net benefits (expenses) for specific items     (87) $ (547)
Operating Segments | Deferred amounts related to certain riders | Virginia Electric and Power Company        
Segment Reporting Information [Line Items]        
Charge for the write-off of certain previously deferred amounts     36  
Charge for the write-off of certain previously deferred amounts, after tax     $ 27