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Operating Segments - Virginia Power (Narrative) (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]        
Gain (loss) on investments     $ 589 $ 228
Charge for the write-off of certain previously deferred amounts $ 122 $ 1 219 136
Virginia Electric and Power Company        
Segment Reporting Information [Line Items]        
Gain (loss) on investments     85 31
Operating Segments        
Segment Reporting Information [Line Items]        
After- tax net benefits (expenses)     155  
Gain (loss) on investments     518 183
Gain (loss) on investments, after tax     $ 402 $ 142
Investment, Type [Extensible Enumeration] Nuclear Decommissioning Trust Fund [Member] Nuclear Decommissioning Trust Fund [Member] Nuclear Decommissioning Trust Fund [Member] Nuclear Decommissioning Trust Fund [Member]
Operating Segments | Corporate and Other        
Segment Reporting Information [Line Items]        
After- tax net benefits (expenses)     $ 28 $ (14)
After- tax net benefits (expenses) for specific items     319 245
Operating Segments | Virginia Electric and Power Company        
Segment Reporting Information [Line Items]        
After- tax net benefits (expenses)       (154)
Charge for amortization of a regulatory asset, 2021 Triennial Review       183
Charge for amortization of a regulatory asset, 2021 Triennial Review, after tax       136
Gain (loss) on investments     74 24
Gain (loss) on investments, after tax     $ 55 18
Charge for the write-off of certain previously deferred amounts       36
Charge for the write-off of certain previously deferred amounts, after tax       $ 27
Investment, Type [Extensible Enumeration] Nuclear Decommissioning Trust Fund [Member] Nuclear Decommissioning Trust Fund [Member] Nuclear Decommissioning Trust Fund [Member] Nuclear Decommissioning Trust Fund [Member]
Charge for write-off of certain early stage development costs     $ 30  
Charge for 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)     27 $ (151)
After- tax net benefits (expenses) for specific items     $ 25 $ (155)