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Significant Financing Transactions (Narrative) (Detail) - USD ($)
 1 Months Ended 2 Months Ended 3 Months Ended 9 Months Ended
Nov. 08, 2023
Sep. 01, 2022
Oct. 31, 2023
Sep. 30, 2023
Aug. 31, 2023
Jul. 31, 2023
Jun. 30, 2023
Apr. 30, 2023
Mar. 31, 2023
Jan. 31, 2023
Jun. 30, 2022
May 31, 2022
Nov. 30, 2023
Sep. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Aug. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Feb. 28, 2023
Dec. 31, 2022
Nov. 30, 2020
Aug. 31, 2020
Jul. 31, 2020
Debt Instrument [Line Items]                                                
Facility Limit       $ 6,000,000,000 [1]   $ 600,000,000               $ 6,000,000,000 [1]       $ 6,000,000,000 [1]            
Line of credit facility, maturity date                                   Dec. 31, 2024            
Short-term debt       3,785,000,000                   3,785,000,000       $ 3,785,000,000     $ 3,423,000,000 [2]      
Line of credit issued                                   3,475,000,000            
Supplemental credit facility borrowings       $ 0                   $ 0       $ 0     450,000,000 [2]      
Preferred stock shares authorized       20,000,000                   20,000,000       20,000,000            
Issuance of common stock                                   $ 91,000,000 $ 1,744,000,000          
Issuance of stock                           $ 6,000,000   $ 44,000,000   91,000,000 $ 1,847,000,000          
Securities due within one year       $ 4,147,000,000                   $ 4,147,000,000       $ 4,147,000,000     3,337,000,000 [2]      
Common Stock                                                
Debt Instrument [Line Items]                                                
Stock repurchased, shares                           0       0            
Issuance of stock (in shares)                     400,000 900,000       1,000,000   2,000,000 23,000,000          
Issuance of stock                     $ 30,000,000 $ 72,000,000   $ 6,000,000   $ 44,000,000   $ 91,000,000 $ 1,847,000,000          
Stock repurchase program, authorized amount                                           $ 1,000,000,000   $ 3,000,000,000
Series A Preferred Stock                                                
Debt Instrument [Line Items]                                                
Recorded dividend                                     $ 12,000,000          
Recorded dividends per share                                     $ 7.292          
Recorded interest expense                               5,000,000     $ 7,000,000          
Series B Preferred Stock                                                
Debt Instrument [Line Items]                                                
Recorded dividend                           $ 9,000,000   $ 9,000,000   $ 27,000,000 $ 27,000,000          
Recorded dividends per share                           $ 11.625   $ 11.625   $ 34.875 $ 34.875          
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                                   $ 91,000,000 $ 134,000,000          
Issuance of stock (in shares)                                   2,000,000 2,000,000          
At-the-Market Program                                                
Debt Instrument [Line Items]                                                
Sale agreement expiration month and year                                   2023-06            
Floating Rate Demand Notes                                                
Debt Instrument [Line Items]                                                
Short-term debt       423,000,000                   $ 423,000,000       $ 423,000,000     347,000,000      
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       500,000,000                   500,000,000       500,000,000            
DESC | Short-term Indebtedness                                                
Debt Instrument [Line Items]                                                
Facility Limit                 $ 2,200,000,000           $ 2,200,000,000                  
DESC | Senior Notes Due in 2053 | Subsequent Event                                                
Debt Instrument [Line Items]                                                
Total Long-term Debt     $ 500,000,000                                          
Interest rate percentage     6.25%                                          
Debt maturity year     2053                                          
Questar Gas Company                                                
Debt Instrument [Line Items]                                                
Facility Limit       250,000,000                   250,000,000       250,000,000            
Virginia Electric and Power Company                                                
Debt Instrument [Line Items]                                                
Facility Limit [3]       6,000,000,000                   6,000,000,000       6,000,000,000            
Aggregate outstanding principal             $ 160,000,000                                  
Short-term debt       942,000,000                   $ 942,000,000       $ 942,000,000     941,000,000 [4]      
Interest rate percentage             3.65%                                  
Debt, maturity month and year             2027-10                                  
Authorized but unissued shares of common stock           3,250,000,000                                    
Issuance of stock (in shares)                           0   0   0 0          
Securities due within one year       380,000,000                   $ 380,000,000       $ 380,000,000     $ 1,164,000,000 [4]      
Virginia Electric and Power Company | Virginia Regulation                                                
Debt Instrument [Line Items]                                                
Capitalization ratio           52.10%   52.10%                                
Virginia Electric and Power Company | Interest Rate Swap                                                
Debt Instrument [Line Items]                                                
Debt, maturity month and year                 2023-12                              
Reduction in securities due within one year                 $ 448,000,000           448,000,000                  
Derivative notional value                                             $ 900,000,000  
Virginia Electric and Power Company | Subsequent Event                                                
Debt Instrument [Line Items]                                                
Authorized but unissued shares of common stock                         3,250,000,000                      
Issuance of common stock                         $ 2,600,000,000                      
Virginia Electric and Power Company | Subsequent Event | Virginia Regulation                                                
Debt Instrument [Line Items]                                                
Capitalization ratio                         52.10%                      
Virginia Electric and Power Company | Subsequent Event | Common Stock                                                
Debt Instrument [Line Items]                                                
Issuance of stock (in shares)                         39,455                      
Virginia Electric and Power Company | Senior Notes Due in 2033                                                
Debt Instrument [Line Items]                                                
Total Long-term Debt         $ 400,000,000       $ 750,000,000           $ 750,000,000                  
Interest rate percentage         5.30%       5.00%           5.00%                  
Debt maturity year         2033                   2033                  
Virginia Electric and Power Company | Senior Notes Due in 2053                                                
Debt Instrument [Line Items]                                                
Total Long-term Debt         $ 600,000,000       $ 750,000,000           $ 750,000,000                  
Interest rate percentage         5.70%       5.45%           5.45%                  
Debt maturity year         2053                   2053                  
Dominion Energy                                                
Debt Instrument [Line Items]                                                
Aggregate outstanding principal       $ 2,200,000,000                   $ 2,200,000,000       $ 2,200,000,000            
Preferred stock shares issued       1,800,000                   1,800,000       1,800,000     1,800,000      
Preferred stock shares outstanding       1,800,000                   1,800,000       1,800,000     1,800,000      
Dominion Energy | Series B Preferred Stock                                                
Debt Instrument [Line Items]                                                
Preferred stock shares issued             800,000                           800,000      
Preferred stock shares outstanding             800,000                           800,000      
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      
Preferred stock shares outstanding       1,000,000                   1,000,000       1,000,000     1,000,000      
Dominion Energy | Subsequent Event                                                
Debt Instrument [Line Items]                                                
Facility Limit     $ 500,000,000                                          
Line of credit facility remaining borrowing and terminated     225,000,000                                          
GENCO | Short-term Indebtedness                                                
Debt Instrument [Line Items]                                                
Facility Limit                 $ 200,000,000           $ 200,000,000                  
PSNC | Senior Notes Due in 2033                                                
Debt Instrument [Line Items]                                                
Total Long-term Debt $ 75,000,000                                              
Interest rate percentage 6.16%                                              
Debt maturity year 2033                                              
PSNC | Senior Notes Due in 2053                                                
Debt Instrument [Line Items]                                                
Total Long-term Debt $ 75,000,000                                              
Interest rate percentage 6.73%                                              
Debt maturity year 2053                                              
2019 Series A Corporate Units | Common Stock                                                
Debt Instrument [Line Items]                                                
Issuance of stock (in shares)                     19,400,000                          
Issuance of stock                     $ 1,600,000,000                          
2019 Series A Corporate Units | Series A Preferred Stock                                                
Debt Instrument [Line Items]                                                
Preferred stock dividend rate percentage                       1.75%         1.75%              
Preferred stock dividend rate increase percentage   6.75%                                            
Stock repurchased, shares                       1,600,000                        
Joint Revolving Credit Facility                                                
Debt Instrument [Line Items]                                                
Facility Limit       $ 6,000,000,000                   $ 6,000,000,000       $ 6,000,000,000            
Letter of Credit                                                
Debt Instrument [Line Items]                                                
Facility Limit       110,000,000         100,000,000         110,000,000 100,000,000     110,000,000            
Credit facility, outstanding amount       0                   0       0            
Letters of credit issued and outstanding       57,000,000                   57,000,000       57,000,000            
Letter of Credit | Maximum                                                
Debt Instrument [Line Items]                                                
Letters of credit issued and outstanding       1,000,000                   1,000,000       1,000,000            
Letter of Credit | Credit Facility, Maturing in June 2024                                                
Debt Instrument [Line Items]                                                
Facility Limit       30,000,000                   30,000,000       30,000,000            
Credit facility, outstanding amount       25,000,000                   25,000,000       $ 25,000,000     $ 25,000,000      
Line of credit facility, maturity date                                   Jun. 30, 2024            
Letter of Credit | Virginia Electric and Power Company                                                
Debt Instrument [Line Items]                                                
Facility Limit                 $ 200,000,000 $ 125,000,000         200,000,000                  
Line of credit facility, maturity date                   Jan. 31, 2026                            
Line of credit issued                                   $ 0            
Sustainability Revolving Credit Agreement | Dominion Energy                                                
Debt Instrument [Line Items]                                                
Debt maturity year                 2024                              
Supplemental credit facility borrowings       900,000,000                   900,000,000       900,000,000     $ 450,000,000      
Sustainability Revolving Credit Agreement | Dominion Energy | General Corporate Purposes                                                
Debt Instrument [Line Items]                                                
Proceeds from borrowings       450,000,000         $ 450,000,000                              
Repayments of borrowings               $ 450,000,000                                
Sustainability Revolving Credit Agreement | Dominion Energy | General Corporate Purposes | Subsequent Event                                                
Debt Instrument [Line Items]                                                
Repayments of borrowings     450,000,000                                          
364 Term loan facility                                                
Debt Instrument [Line Items]                                                
Facility Limit           $ 600,000,000       $ 2,500,000,000                            
Credit facility, outstanding amount       225,000,000   $ 750,000,000     $ 1,000,000,000 $ 1,000,000,000       225,000,000 $ 1,000,000,000     225,000,000   $ 500,000,000        
Line of credit facility, maturity date           Jul. 24, 2024       Jan. 31, 2024                            
Securities due within one year       $ 2,500,000,000                   $ 2,500,000,000       $ 2,500,000,000            
364 Term loan facility | Subsequent Event                                                
Debt Instrument [Line Items]                                                
Facility Limit     $ 2,250,000,000                                          
Line of credit facility, maturity date     Oct. 31, 2024                                          
364 Term loan facility | General Corporate Purposes | Subsequent Event                                                
Debt Instrument [Line Items]                                                
Credit facility, outstanding amount     $ 1,000,000,000                                          
[1] 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.
[2] Dominion Energy’s Consolidated Balance Sheet at December 31, 2022 has been derived from the audited Consolidated Balance Sheet at that date and recast for certain events as discussed in Note 1.
[3] The full amount of the facility is available to Virginia Power, less any amounts outstanding to co-borrowers Dominion Energy, Questar Gas 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, 2023, 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.
[4] Virginia Power’s Consolidated Balance Sheet at December 31, 2022 has been derived from the audited Consolidated Balance Sheet at that date.