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Short-Term Debt and Credit Agreements (Narrative) (Detail) - USD ($)
 1 Months Ended 12 Months Ended
Jan. 31, 2025
May 31, 2024
Mar. 31, 2024
Oct. 31, 2023
Sep. 30, 2023
Jul. 31, 2023
Mar. 31, 2023
Jan. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Feb. 27, 2025
Jun. 30, 2024
Feb. 28, 2023
Feb. 27, 2023
Nov. 30, 2022
Oct. 31, 2020
Nov. 30, 2017
Debt Instrument [Line Items]                                    
Facility Limit           $ 600,000,000     $ 6,000,000,000 [1],[2] $ 6,000,000,000 [2]                
Line of credit issued                 3,000,000,000 5,725,000,000 $ 0              
Securities due within one year [3]                 1,725,000,000 6,589,000,000                
Short-term debt                 $ 2,500,000,000 $ 3,956,000,000                
Weighted-average percentage interest rates                 4.74% 5.69%                
Floating Rate Demand Notes                                    
Debt Instrument [Line Items]                                    
Short-term debt                 $ 439,000,000 $ 409,000,000                
Weighted-average percentage interest rates                 0.50% 5.50%                
Floating Rate Demand Notes | Shelf Registration for Sale of Demand Notes                                    
Debt Instrument [Line Items]                                    
Facility Limit                                   $ 3,000,000,000
Debt instrument, maximum principal outstanding amount                                 $ 1,000,000,000  
Dominion Energy South Carolina Inc                                    
Debt Instrument [Line Items]                                    
Facility Limit                 $ 500,000,000                  
Short-term indebtedness outstanding             $ 2,200,000,000                      
Debt, maturity month and year             2025-03                      
Dominion Energy South Carolina Inc | Subsequent Event                                    
Debt Instrument [Line Items]                                    
Short-term indebtedness outstanding $ 1,800,000,000                                  
GENCO                                    
Debt Instrument [Line Items]                                    
Short-term indebtedness outstanding             $ 200,000,000                      
Debt, maturity month and year             2025-03                      
GENCO | Subsequent Event                                    
Debt Instrument [Line Items]                                    
Short-term indebtedness outstanding 300,000,000                                  
Virginia Electric and Power Company                                    
Debt Instrument [Line Items]                                    
Facility Limit [5]                 6,000,000,000 [4] $ 6,000,000,000                
Securities due within one year [6]                 548,000,000 381,000,000                
Short-term debt                 $ 950,000,000 $ 455,000,000                
Weighted-average percentage interest rates                 4.73% 5.65%                
Revolving Credit Facility                                    
Debt Instrument [Line Items]                                    
Facility Limit                 $ 6,000,000,000                  
Revolving Credit Facility | Virginia Electric and Power Company                                    
Debt Instrument [Line Items]                                    
Facility Limit                               $ 3,000,000,000    
Credit facility, maturity date                 Dec. 31, 2027                  
Letter of Credit                                    
Debt Instrument [Line Items]                                    
Facility Limit             $ 100,000,000                      
Line of credit issued                 $ 112,000,000 $ 124,000,000                
Letters of credit issued and outstanding                 48,000,000 54,000,000                
Letter of Credit | Credit Facility, Maturing in June 2022                                    
Debt Instrument [Line Items]                                    
Credit facility, outstanding amount                   25,000,000                
Letter of Credit | Credit Facility Maturing In June 2024                                    
Debt Instrument [Line Items]                                    
Facility Limit             $ 30,000,000                      
Credit facility, maturity date             Jun. 30, 2024                      
Letter of Credit | Credit Facility in June 2024                                    
Debt Instrument [Line Items]                                    
Facility Limit                         $ 275,000,000          
Letters of credit issued and outstanding                 88,000,000                  
Letter of Credit | Credit Facility in January 2025 | Subsequent Event                                    
Debt Instrument [Line Items]                                    
Facility Limit 150,000,000                                  
Letter of Credit | Credit Facility Through February 2025 | Subsequent Event                                    
Debt Instrument [Line Items]                                    
Letters of credit issued and outstanding                       $ 50,000,000            
Letter of Credit | Dominion Energy South Carolina Inc | Credit Facility in June 2024                                    
Debt Instrument [Line Items]                                    
Letters of credit issued and outstanding                 88,000,000                  
Letter of Credit | Dominion Energy South Carolina Inc | Credit Facility in January 2025 | Subsequent Event                                    
Debt Instrument [Line Items]                                    
Facility Limit 50,000,000                                  
Letter of Credit | Virginia Electric and Power Company                                    
Debt Instrument [Line Items]                                    
Facility Limit             $ 300,000,000   2,000,000,000                  
Credit facility, outstanding amount                             $ 0      
Letter of Credit | Virginia Electric and Power Company | Maximum                                    
Debt Instrument [Line Items]                                    
Letters of credit issued and outstanding                   1,000,000                
Letter of Credit | Virginia Electric and Power Company | Credit Facility Maturing In June 2024                                    
Debt Instrument [Line Items]                                    
Letters of credit issued and outstanding                 77,000,000                  
Letter of Credit | Virginia Electric and Power Company | Credit Facility, Maturing in January 2026                                    
Debt Instrument [Line Items]                                    
Facility Limit               $ 125,000,000                    
Credit facility, maturity date               Jan. 31, 2026                    
Letter of Credit | Virginia Electric and Power Company | Credit Facility in June 2024                                    
Debt Instrument [Line Items]                                    
Letters of credit issued and outstanding                 $ 77,000,000                  
Letter of Credit | Virginia Electric and Power Company | Credit Facility in January 2025 | Subsequent Event                                    
Debt Instrument [Line Items]                                    
Facility Limit $ 100,000,000                                  
Letter of Credit | Virginia Electric and Power Company | Credit Facility Entered in January 2025-Through February 2025 | Subsequent Event                                    
Debt Instrument [Line Items]                                    
Letters of credit issued and outstanding                       $ 50,000,000            
364 Term loan facility                                    
Debt Instrument [Line Items]                                    
Facility Limit       $ 500,000,000       $ 2,500,000,000                    
Credit facility, outstanding amount         $ 225,000,000 750,000,000 1,000,000,000 $ 1,000,000,000           $ 500,000,000        
Securities due within one year                   2,500,000,000                
Credit facility, maturity date               Jan. 31, 2024                    
Repayments of borrowings         $ 750,000,000                          
Line of credit facility remaining borrowing and terminated       225,000,000                            
364 Term loan facility | Term Loan Facility, Maturing in July 2024                                    
Debt Instrument [Line Items]                                    
Facility Limit           $ 600,000,000                        
Credit facility, maturity date           Jul. 31, 2024                        
Repayments of borrowings     $ 2,500,000,000                              
364 Term loan facility | Term Loan Facility, Maturing in Oct 2024                                    
Debt Instrument [Line Items]                                    
Facility Limit       $ 2,250,000,000                            
Line of credit issued     500,000,000                              
Securities due within one year                   $ 2,250,000,000                
Credit facility, maturity date       Oct. 31, 2024                            
Repayments of borrowings   $ 976,000,000 1,800,000,000                              
364 Term loan facility | General Corporate                                    
Debt Instrument [Line Items]                                    
Credit facility, outstanding amount             $ 750,000,000 $ 1,000,000,000           $ 500,000,000        
364 Term loan facility | General Corporate | Term Loan Facility, Maturing in Oct 2024                                    
Debt Instrument [Line Items]                                    
Line of credit issued     $ 500,000,000                              
[1] In May 2024, the joint revolving credit facility was amended to remove Questar Gas as a co-borrower.
[2] This credit facility matures in June 2026, with the potential to be extended by the borrowers to June 2028, and can be used by the borrowers under the credit facility to support bank borrowings and the issuance of commercial paper, as well as to support up to a combined $2.0 billion of letters of credit.
[3] See Note 16 for amounts attributable to VIEs.
[4] In May 2024, the joint revolving credit facility was amended to remove Questar Gas as a co-borrower
[5] The full amount of the facility is available to Virginia Power, less any amounts outstanding to co-borrowers Dominion Energy and DESC. The sub-limit for Virginia Power is set pursuant to the terms of the facility but can be changed at the option of the borrowers multiple times per year. At December 31, 2024, the sub-limit for Virginia Power was $1.75 billion. If Virginia Power has liquidity needs in excess of its sub-limit, the sub-limit may be changed or such needs may be satisfied through short-term intercompany borrowings from Dominion Energy. This credit facility matures in June 2026, with the potential to be extended by the borrowers to June 2028. The credit facility can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $2.0 billion (or the sub-limit, whichever is less) of letters of credit.
[6] See Note 16 for amounts attributable to VIEs.