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Significant Financing Transactions (Narrative) (Detail) - USD ($)
 1 Months Ended 3 Months Ended 5 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2024
Sep. 30, 2024
Aug. 31, 2024
Jun. 30, 2024
May 31, 2024
Mar. 31, 2024
Jan. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Oct. 31, 2023
Mar. 31, 2023
Nov. 30, 2020
Debt Instrument [Line Items]                                
Facility Limit [1],[2]   $ 6,000,000,000           $ 6,000,000,000   $ 6,000,000,000 $ 6,000,000,000          
Short-term debt   $ 4,104,000,000           $ 4,104,000,000   $ 4,104,000,000 4,104,000,000   $ 3,956,000,000 [3]      
Line of credit issued                     $ 3,000,000,000 $ 3,475,000,000        
Preferred stock shares authorized   20,000,000           20,000,000   20,000,000 20,000,000          
Issuance of common stock                     $ 102,000,000 $ 91,000,000        
Securities due within one year [4]   $ 1,820,000,000           $ 1,820,000,000   $ 1,820,000,000 $ 1,820,000,000   6,589,000,000 [3]      
Period of deferral         10 years                      
Common Stock                                
Debt Instrument [Line Items]                                
Stock repurchased, shares                     0          
Issuance of stock (in shares)               1,000,000 0   2,000,000 2,000,000        
Stock repurchase program, authorized amount   $ 900,000,000           $ 900,000,000   $ 900,000,000 $ 900,000,000         $ 1,000,000,000
Series B Preferred Stock                                
Debt Instrument [Line Items]                                
Recorded dividend               $ 4,000,000 $ 9,000,000   $ 21,000,000 $ 27,000,000        
Recorded dividends per share               $ 11.625 $ 11.625   $ 33.172 $ 34.875        
Preferred stock tendered, aggregate liquidation preference       $ 440,000,000                        
Deemed dividend                     $ 9,000,000          
Series C Preferred Stock                                
Debt Instrument [Line Items]                                
Recorded dividend               $ 11,000,000 $ 11,000,000   $ 33,000,000 $ 33,000,000        
Recorded dividends per share               $ 10.875 $ 10.875   $ 32.625 $ 32.625        
Various Programs                                
Debt Instrument [Line Items]                                
Issuance of common stock                     $ 102,000,000 $ 91,000,000        
Issuance of stock (in shares)                     2,000,000 2,000,000        
At-the-Market Program | Maximum                                
Debt Instrument [Line Items]                                
Sale of stock authorized amount         $ 1,800,000,000                      
Forward Sale Agreements                                
Debt Instrument [Line Items]                                
Weighted average initial forward price per share   $ 57.62               $ 53.23            
Forward sale agreements, number of shares of common stock to be settled   3,800,000               11,400,000            
Floating Rate Demand Notes                                
Debt Instrument [Line Items]                                
Facility Limit                         3,000,000,000      
Short-term debt   $ 482,000,000           $ 482,000,000   $ 482,000,000 $ 482,000,000   409,000,000      
DESC                                
Debt Instrument [Line Items]                                
Facility Limit   500,000,000           500,000,000   500,000,000 500,000,000          
Virginia Electric and Power Company                                
Debt Instrument [Line Items]                                
Facility Limit [5],[6]   6,000,000,000           6,000,000,000   6,000,000,000 6,000,000,000          
Short-term debt   740,000,000           $ 740,000,000   740,000,000 $ 740,000,000   455,000,000 [7]      
Issuance of stock (in shares)               0 0   0 0        
Securities due within one year   $ 540,000,000           $ 540,000,000   $ 540,000,000 $ 540,000,000   $ 381,000,000 [7]      
Interest Rate         3.80%                      
Aggregate outstanding principal         $ 243,000,000                      
Debt, maturity month and year         2027-05                      
Virginia Electric and Power Company | Senior Notes Due in 2034                                
Debt Instrument [Line Items]                                
Debt instrument maturity year     2034                          
Interest Rate     5.05%                          
Debt issued amount     $ 600,000,000                          
Virginia Electric and Power Company | Senior Notes Due in 2054                                
Debt Instrument [Line Items]                                
Debt instrument maturity year     2054                          
Interest Rate     5.55%                          
Debt issued amount     $ 600,000,000                          
Dominion Energy                                
Debt Instrument [Line Items]                                
Preferred stock shares issued   1,400,000           1,400,000   1,400,000 1,400,000   1,800,000      
Preferred stock shares outstanding   1,400,000           1,400,000   1,400,000 1,400,000   1,800,000      
Dominion Energy | Series B Preferred Stock                                
Debt Instrument [Line Items]                                
Preferred stock shares issued   400,000           400,000   400,000 400,000   800,000      
Preferred stock shares outstanding   400,000           400,000   400,000 400,000   800,000      
Stock repurchased, shares       400,000                        
Dominion Energy | Series C Preferred Stock                                
Debt Instrument [Line Items]                                
Preferred stock shares issued   1,000,000           1,000,000   1,000,000 1,000,000   1,000,000      
Preferred stock shares outstanding   1,000,000           1,000,000   1,000,000 1,000,000   1,000,000      
Dominion Energy | 2024 Series A EJSNs                                
Debt Instrument [Line Items]                                
Debt instrument maturity year         2055                      
Interest reset period         5 years                      
Interest Rate         6.875%                      
Interest rate spread         2.386%                      
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]         us-gaap:UsTreasuryUstInterestRateMember                      
Interest rate minimum reset         6.875%                      
Dominion Energy | 2024 Series B EJSNs                                
Debt Instrument [Line Items]                                
Debt instrument maturity year         2054                      
Interest reset period         5 years                      
Interest Rate         7.00%                      
Interest rate spread         2.511%                      
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]         us-gaap:UsTreasuryUstInterestRateMember                      
Interest rate minimum reset         7.00%                      
Dominion Energy | Senior Notes Due In February 2024                                
Debt Instrument [Line Items]                                
Recorded interest expense                     $ 10,000,000          
Dominion Energy | Enhanced Junior Subordinated Notes                                
Debt Instrument [Line Items]                                
Junior subordinated notes         $ 2,000,000,000                      
Dominion Energy | Enhanced Junior Subordinated Notes | 2024 Series A EJSNs                                
Debt Instrument [Line Items]                                
Junior subordinated notes         1,000,000,000                      
Dominion Energy | Enhanced Junior Subordinated Notes | 2024 Series B EJSNs                                
Debt Instrument [Line Items]                                
Junior subordinated notes         1,000,000,000                      
Dominion Energy | 3.80% Peninsula Ports Authority Due in 2033 | Subsequent Event                                
Debt Instrument [Line Items]                                
Debt instrument maturity year 2033                              
Interest Rate 3.80%                              
Debt, redeemed remaining principal outstanding $ 27,000,000                              
Dominion Energy | 3.80% Peninsula Ports Authority Due in 2033 | Maximum | Subsequent Event                                
Debt Instrument [Line Items]                                
Early redemption charges to be paid $ 1,000,000                              
Dominion Energy | October 2014 Hybrids | Subsequent Event                                
Debt Instrument [Line Items]                                
Debt instrument maturity year 2054                              
Debt, redeemed remaining principal outstanding $ 685,000,000                              
Early redemption charges to be paid $ 7,000,000                              
Joint Revolving Credit Facility                                
Debt Instrument [Line Items]                                
Facility Limit   $ 6,000,000,000           $ 6,000,000,000   $ 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   48,000,000           48,000,000   48,000,000 48,000,000   $ 54,000,000      
Letter of Credit | Credit Facility, Maturing in June 2024                                
Debt Instrument [Line Items]                                
Facility Limit   30,000,000           30,000,000   30,000,000 $ 30,000,000          
Letter of credit                         25,000,000      
Line of credit facility, maturity date                     Jun. 30, 2024          
Letter of Credit | Credit Facility in June 2024                                
Debt Instrument [Line Items]                                
Facility Limit       $ 125,000,000                        
Letters of credit issued and outstanding   0           0   0 $ 0          
Letter of Credit | Virginia Electric and Power Company                                
Debt Instrument [Line Items]                                
Facility Limit             $ 125,000,000               $ 300,000,000  
Letter of credit                         0      
Line of credit facility, maturity date             Jan. 31, 2026                  
Line of credit issued                     123,000,000   124,000,000      
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 in June 2024                                
Debt Instrument [Line Items]                                
Facility Limit       $ 125,000,000                        
Letters of credit issued and outstanding   $ 21,000,000           $ 21,000,000   $ 21,000,000 $ 21,000,000          
364 Term loan facility                                
Debt Instrument [Line Items]                                
Securities due within one year                         2,500,000,000      
364 Term loan facility | Credit Facility, Maturing In July 2024                                
Debt Instrument [Line Items]                                
Facility Limit             $ 2,500,000,000                  
Repayments of borrowings           $ 2,500,000,000                    
364 Term loan facility | Credit Facility, Maturing In October 2024                                
Debt Instrument [Line Items]                                
Facility Limit                           $ 2,250,000,000    
Line of credit issued           500,000,000                    
Repayments of borrowings         976,000,000 1,800,000,000                    
Securities due within one year                         2,250,000,000      
364 Term loan facility | Credit Facility, Maturing In October 2024 | General Corporate Purposes                                
Debt Instrument [Line Items]                                
Line of credit issued           $ 500,000,000                    
Sustainability Revolving Credit Facility | Dominion Energy                                
Debt Instrument [Line Items]                                
Line of credit facility, maturity date       Jun. 30, 2025                        
Repayments of borrowings         $ 450,000,000                      
Securities due within one year                         $ 450,000,000      
[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] Dominion Energy’s Consolidated Balance Sheet at December 31, 2023 has been derived from the audited Consolidated Balance Sheet at that date.
[4] See Note 15 for amounts attributable to VIEs.
[5] In May 2024, the joint revolving credit facility was amended to remove Questar Gas as a co-borrower.
[6] 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 September 30, 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.
[7] Virginia Power’s Consolidated Balance Sheet at December 31, 2023 has been derived from the audited Consolidated Balance Sheet at that date.