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Significant Financing Transactions (Narrative) (Detail) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Aug. 31, 2025
Jun. 30, 2025
May 31, 2025
Apr. 30, 2025
Feb. 28, 2025
Jun. 30, 2024
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Oct. 31, 2025
Jul. 31, 2025
Jan. 31, 2025
Dec. 31, 2023
Mar. 31, 2023
Nov. 30, 2020
Nov. 30, 2017
Debt Instrument [Line Items]                                          
Facility Limit $ 8,000,000,000             $ 8,000,000,000       $ 8,000,000,000                  
Short-term debt $ 2,522,000,000             $ 2,522,000,000       2,522,000,000   $ 2,500,000,000 [1]              
Line of credit issued                       $ 0 $ 3,000,000,000                
Preferred stock shares authorized 20,000,000             20,000,000       20,000,000                  
Dividend stock               $ 11,000,000     $ 15,000,000 $ 33,000,000 63,000,000                
Borrowings outstanding $ 0             0       0   0              
Issuance of common stock                       105,000,000 102,000,000                
Issuance of common stock               $ 35,000,000     $ 35,000,000 $ 105,000,000 $ 102,000,000                
Common Stock                                          
Debt Instrument [Line Items]                                          
Stock repurchased, shares                       0                  
Issuance of stock (in shares)               1,000,000     1,000,000 2,000,000 2,000,000                
Issuance of common stock               $ 35,000,000     $ 35,000,000 $ 105,000,000 $ 102,000,000                
Stock repurchase program, authorized amount $ 900,000,000             $ 900,000,000       900,000,000               $ 1,000,000,000  
Series B Preferred Stock                                          
Debt Instrument [Line Items]                                          
Preferred stock tendered, aggregate liquidation preference             $ 440,000,000                            
Deemed dividends             $ 9,000,000                            
Various Programs                                          
Debt Instrument [Line Items]                                          
Issuance of common stock                       $ 105,000,000 $ 102,000,000                
Various Programs | Maximum                                          
Debt Instrument [Line Items]                                          
Issuance of stock (in shares)                       2,000,000 2,000,000                
Forward Sale Agreements                                          
Debt Instrument [Line Items]                                          
Forward sale agreements, number of shares of common stock to be settled 2,400,000   11,000,000         2,400,000 11,000,000 8,800,000   2,400,000                  
Weighted average initial forward price per share               $ 59.91 $ 55.83 $ 55.34                      
Forward Sale Agreement Expected to be Settled in Fourth Quarter of 2027                                          
Debt Instrument [Line Items]                                          
Forward sale agreements, number of shares of common stock to be settled 9,600,000             9,600,000       9,600,000                  
Weighted average initial forward price per share               $ 61.11                          
Aggregate Forward Sale Agreement                                          
Debt Instrument [Line Items]                                          
Forward sale agreements, number of shares of common stock to be settled                   18,500,000                      
Weighted average initial forward price per share                   $ 56.62                      
Sales Agency Agreements to Effect Sales Under At-the-market Program | Maximum                                          
Debt Instrument [Line Items]                                          
Sale of stock authorized amount           $ 1,200,000,000                              
Floating Rate Demand Notes                                          
Debt Instrument [Line Items]                                          
Short-term debt $ 451,000,000             $ 451,000,000       $ 451,000,000   439,000,000              
Floating Rate Demand Notes | Shelf Registration for Sale of Demand Notes                                          
Debt Instrument [Line Items]                                          
Facility Limit                                         $ 3,000,000,000
DESC                                          
Debt Instrument [Line Items]                                          
Facility Limit     $ 1,000,000,000   $ 500,000,000       $ 1,000,000,000             $ 900,000,000          
Short-term indebtedness outstanding                   $ 1,800,000,000                      
GENCO                                          
Debt Instrument [Line Items]                                          
Short-term indebtedness outstanding                   $ 300,000,000                      
Virginia Electric and Power Company                                          
Debt Instrument [Line Items]                                          
Facility Limit [2] 7,000,000,000             7,000,000,000       7,000,000,000                  
Short-term debt $ 0             0       0   $ 950,000,000 [3]              
Issuance of common stock   $ 1,400,000,000 $ 2,100,000,000                 3,500,000,000 $ 0                
Issuance of common stock               $ 1,400,000,000       $ 3,500,000,000                  
Virginia Electric and Power Company | Common Stock                                          
Debt Instrument [Line Items]                                          
Issuance of stock (in shares)   19,630 30,006         20,000       50,000   0              
Issuance of common stock               $ 1,400,000,000       $ 3,500,000,000                  
Virginia Electric and Power Company | Senior Notes Due In 2035                                          
Debt Instrument [Line Items]                                          
Debt instrument maturity year 2035                 2035                      
Interest Rate 4.90%             4.90%   5.15%   4.90%                  
Debt issued amount $ 825,000,000             $ 825,000,000   $ 625,000,000   $ 825,000,000                  
Virginia Electric and Power Company | Senior Notes Due In 2055                                          
Debt Instrument [Line Items]                                          
Debt instrument maturity year 2055                 2055                      
Interest Rate 5.60%             5.60%   5.65%   5.60%                  
Debt issued amount $ 875,000,000             $ 875,000,000   $ 625,000,000   $ 875,000,000                  
Virginia Electric and Power Company | Tax Exempt Financings 3.125% Due 2030                                          
Debt Instrument [Line Items]                                          
Interest Rate 3.125%             3.125%       3.125%                  
Outstanding principal $ 222,000,000             $ 222,000,000       $ 222,000,000                  
Debt, maturity month and year 2030-10                                        
Dominion Energy | Junior Subordinated Debt                                          
Debt Instrument [Line Items]                                          
Junior subordinated notes   $ 1,500,000,000                                      
Dominion Energy | Junior Subordinated Debt | Subsequent Event                                          
Debt Instrument [Line Items]                                          
Junior subordinated notes                             $ 1,300,000,000            
Dominion Energy | Series B Preferred Stock                                          
Debt Instrument [Line Items]                                          
Preferred stock shares outstanding                                   800,000      
Preferred stock shares issued                                   800,000      
Dividend stock                     4,000,000   $ 21,000,000                
Preferred stock dividend per share                         $ 33.172                
Stock repurchased, shares             400,000                            
Dominion Energy | Series C Preferred Stock                                          
Debt Instrument [Line Items]                                          
Preferred stock shares outstanding 1,000,000             1,000,000       1,000,000   1,000,000              
Dividend stock               $ 11,000,000     $ 11,000,000 $ 33,000,000 $ 33,000,000                
Preferred stock dividend per share               $ 10.875     $ 10.875 $ 32.625 $ 32.625                
Dominion Energy | Series D Preferred Stock                                          
Debt Instrument [Line Items]                                          
Preferred stock dividend per share                     $ 11.625                    
Dominion Energy | 2025 Series A JSN                                          
Debt Instrument [Line Items]                                          
Debt instrument maturity year   2056                                      
Interest Rate   6.00%                                      
Interest reset period   5 years                                      
Debt instrument, basis spread rate   2.262%                                      
Period of deferral   10 years                                      
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]   us-gaap:UsTreasuryUstInterestRateMember                                      
Dominion Energy | 2025 Series A JSN | Junior Subordinated Debt                                          
Debt Instrument [Line Items]                                          
Junior subordinated notes   $ 825,000,000                                      
Dominion Energy | 2025 Series A JSN | Junior Subordinated Debt | Subsequent Event                                          
Debt Instrument [Line Items]                                          
Junior subordinated notes                             625,000,000            
Dominion Energy | 2025 Series A JSN | Maximum                                          
Debt Instrument [Line Items]                                          
Interest rate minimum reset   6.00%                                      
Dominion Energy | 2025 Series B JSN                                          
Debt Instrument [Line Items]                                          
Debt instrument maturity year   2056                                      
Interest Rate   6.20%                                      
Interest reset period   5 years                                      
Debt instrument, basis spread rate   2.006%                                      
Period of deferral   10 years                                      
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]   us-gaap:UsTreasuryUstInterestRateMember                                      
Dominion Energy | 2025 Series B JSN | Junior Subordinated Debt                                          
Debt Instrument [Line Items]                                          
Junior subordinated notes   $ 700,000,000                                      
Dominion Energy | 2025 Series B JSN | Junior Subordinated Debt | Subsequent Event                                          
Debt Instrument [Line Items]                                          
Junior subordinated notes                             625,000,000            
Dominion Energy | 2025 Series B JSN | Maximum                                          
Debt Instrument [Line Items]                                          
Interest rate minimum reset   6.20%                                      
Dominion Energy | Senior Notes Due In February 2024                                          
Debt Instrument [Line Items]                                          
Recorded interest expense                       $ 10,000,000                  
Dominion Energy | Senior Notes Due In 2030                                          
Debt Instrument [Line Items]                                          
Debt instrument maturity year                   2030                      
Interest Rate                   5.00%                      
Debt issued amount                   $ 800,000,000                      
Dominion Energy | Senior Notes Due In 2035                                          
Debt Instrument [Line Items]                                          
Debt instrument maturity year                   2035                      
Interest Rate                   5.45%                      
Debt issued amount                   $ 700,000,000                      
Dominion Energy | Senior Notes Due In 2028                                          
Debt Instrument [Line Items]                                          
Debt instrument maturity year       2028                                  
Interest Rate       4.60%                                  
Debt issued amount       $ 1,000,000,000                                  
DESC | First Mortgage Bonds Due in 2035                                          
Debt Instrument [Line Items]                                          
Interest Rate                                 5.30%        
Debt issued amount                                 $ 450,000,000        
Joint Revolving Credit Facility                                          
Debt Instrument [Line Items]                                          
Facility Limit $ 6,000,000,000       7,000,000,000     $ 6,000,000,000       6,000,000,000                  
Letter of Credit                                          
Debt Instrument [Line Items]                                          
Facility Limit                                     $ 100,000,000    
Letters of credit issued and outstanding 86,000,000             86,000,000       86,000,000   $ 48,000,000              
Letter of Credit | Credit Facility, Maturing in June 2024                                          
Debt Instrument [Line Items]                                          
Facility Limit 275,000,000             275,000,000       275,000,000                  
Letters of credit issued and outstanding 89,000,000             89,000,000       89,000,000   88,000,000              
Letter of Credit | Credit Facility Maturing In April 2030                                          
Debt Instrument [Line Items]                                          
Facility Limit         $ 3,000,000,000                                
Line of credit facility, maturity date         Apr. 30, 2030                                
Letter of Credit | Credit Facility Maturing In June 2026                                          
Debt Instrument [Line Items]                                          
Facility Limit 2,000,000,000             2,000,000,000       $ 2,000,000,000                  
Line of credit facility, maturity date                       Jun. 30, 2026                  
Letter of Credit | Credit Facility in January 2025                                          
Debt Instrument [Line Items]                                          
Facility Limit                                 150,000,000        
Letters of credit issued and outstanding 52,000,000             52,000,000       $ 52,000,000                  
Letter of Credit | DESC | Credit Facility, Maturing in June 2024                                          
Debt Instrument [Line Items]                                          
Letters of credit issued and outstanding 89,000,000             89,000,000       89,000,000   88,000,000              
Letter of Credit | DESC | Credit Facility in January 2025                                          
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    
Line of credit issued                       208,000,000   112,000,000              
Letter of Credit | Virginia Electric and Power Company | Maximum                                          
Debt Instrument [Line Items]                                          
Facility Limit 3,000,000,000             3,000,000,000       3,000,000,000                  
Letter of Credit | Virginia Electric and Power Company | Credit Facility, Maturing in June 2024                                          
Debt Instrument [Line Items]                                          
Facility Limit 275,000,000             275,000,000       275,000,000                  
Letters of credit issued and outstanding 78,000,000             78,000,000       78,000,000   $ 77,000,000              
Letter of Credit | Virginia Electric and Power Company | Credit Facility in January 2025                                          
Debt Instrument [Line Items]                                          
Facility Limit                                 $ 100,000,000        
Letters of credit issued and outstanding 50,000,000             50,000,000       50,000,000                  
Letter of Credit | Virginia Electric and Power Company | Credit Facility in January 2025 | Subsequent Event                                          
Debt Instrument [Line Items]                                          
Letters of credit issued and outstanding                             50,000,000            
Letter of Credit | Virginia Electric and Power Company | Credit Facility One in September 2025                                          
Debt Instrument [Line Items]                                          
Facility Limit 300,000,000             300,000,000       300,000,000                  
Letters of credit issued and outstanding 0             0       0                  
Letter of Credit | Virginia Electric and Power Company | Credit Facility One in September 2025 | Subsequent Event                                          
Debt Instrument [Line Items]                                          
Letters of credit issued and outstanding                             262,000,000            
Letter of Credit | Virginia Electric and Power Company | Credit Facility Two in September 2025                                          
Debt Instrument [Line Items]                                          
Facility Limit $ 2,200,000,000             $ 2,200,000,000       $ 2,200,000,000                  
Letter of Credit | Virginia Electric and Power Company | Credit Facility Two in September 2025 | Subsequent Event                                          
Debt Instrument [Line Items]                                          
Letters of credit issued and outstanding                             $ 1,100,000,000            
Sustainability Revolving Credit Facility | Credit Facility Maturing In June 2025                                          
Debt Instrument [Line Items]                                          
Facility Limit         $ 900,000,000                                
Line of credit facility, maturity date         Apr. 30, 2028                                
Sustainability Revolving Credit Facility | Credit Facility Maturing In April 2028                                          
Debt Instrument [Line Items]                                          
Facility Limit         $ 1,000,000,000                                
Line of credit facility, maturity date         Apr. 30, 2030                                
[1] Dominion Energy’s Consolidated Balance Sheet at December 31, 2024 has been derived from the audited Consolidated Balance Sheet at that date.
[2] 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. In April 2025, the sub-limit for Virginia Power was increased from $1.75 billion to $3.0 billion. In July 2025, the sub-limit was increased to $4.0 billion. If Virginia Power has liquidity needs in excess of its current 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 April 2030, with the potential to be extended by the borrowers to April 2032. The credit facility can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $3.0 billion (or the sub-limit, whichever is less) of letters of credit.
[3] Virginia Power’s Consolidated Balance Sheet at December 31, 2024 has been derived from the audited Consolidated Balance Sheet at that date.