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Operating Segments - Dominion Energy (Narrative) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Mar. 31, 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
Charge in connection with settlement of an agreement   $ 47      
Charge in connection with settlement of an agreement, after tax   $ 35      
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]
Corporate and Other | Operating Segments          
Segment Reporting Information [Line Items]          
After- tax net benefits (expenses)       $ 28 $ (14)
After- tax net benefits (expenses) for specific items       319 245
Contracted Energy | Operating Segments          
Segment Reporting Information [Line Items]          
Gain (loss) on investments, after tax       347 124
Loss related to economic hedging activities       107  
Loss related to economic hedging activities after tax       82  
Gain related to economic hedging activities         335
Gain related to economic hedging activities after tax         255
Charge in connection with settlement of an agreement       47  
Charge in connection with settlement of an agreement, after tax       35  
Charge for impairment of nonregulated renewable natural gas facilities       60  
Charge for impairment of nonregulated renewable natural gas facilities after tax       46  
Dominion Energy Virginia | Operating Segments          
Segment Reporting Information [Line Items]          
Gain (loss) on investments, after tax       $ 55 $ 18
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 amortization of a regulatory asset, 2021 Triennial Review         $ 183
Charge for amortization of a regulatory asset, 2021 Triennial Review, after tax         136
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  
Dominion Energy Virginia | Deferred amounts related to certain riders | Operating Segments          
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
Dominion Energy South Carolina | Operating Segments          
Segment Reporting Information [Line Items]          
Benefit related to real estate transactions         31
Benefit related to real estate transactions, after tax         $ 23
Charge in connection with the electric base rate case       58  
Charge in connection with the electric base rate case, after tax       $ 44