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Short-Term Debt and Credit Agreements (Narrative) (Detail) - USD ($)
1 Months Ended 12 Months Ended
Jan. 31, 2023
May 31, 2022
Apr. 30, 2022
Mar. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Feb. 28, 2023
Feb. 27, 2023
Nov. 30, 2022
Jul. 31, 2021
Jun. 30, 2021
Oct. 31, 2020
Nov. 30, 2017
Debt Instrument [Line Items]                          
Facility Limit [1]         $ 6,000,000,000 $ 6,000,000,000              
Short-term debt         $ 3,423,000,000 $ 2,314,000,000              
Weighted-average percentage interest rates         4.73% 0.31%              
Letters of credit outstanding, amount [1]         $ 131,000,000 $ 202,000,000              
Floating Rate Demand Notes                          
Debt Instrument [Line Items]                          
Short-term debt         $ 347,000,000 $ 431,000,000              
Weighted-average percentage interest rates         4.24% 1.25%              
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       2023-03                  
Questar Gas                          
Debt Instrument [Line Items]                          
Facility Limit         250,000,000                
GENCO                          
Debt Instrument [Line Items]                          
Short-term indebtedness outstanding       $ 200,000,000                  
Debt, maturity month and year       2023-03                  
SBL Holdco                          
Debt Instrument [Line Items]                          
Facility Limit           $ 30,000,000              
Dominion Solar Projects III, Inc                          
Debt Instrument [Line Items]                          
Facility Limit           25,000,000              
Virginia Electric and Power Company                          
Debt Instrument [Line Items]                          
Facility Limit [2]         6,000,000,000 6,000,000,000              
Short-term debt         $ 941,000,000 $ 745,000,000              
Weighted-average percentage interest rates         4.68% 0.26%              
Letters of credit outstanding, amount [2]         $ 140,000,000 $ 40,000,000              
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        
Letter of Credit                          
Debt Instrument [Line Items]                          
Facility Limit         $ 2,000,000,000                
Credit facility, amount borrowed               $ 0          
Letter of Credit | Maximum                          
Debt Instrument [Line Items]                          
Letters of credit issued and outstanding             $ 1,000,000            
Letter of Credit | Credit Facility, Maturing in June 2022                          
Debt Instrument [Line Items]                          
Facility Limit     $ 30,000,000                    
Credit facility, maturity date         Jun. 30, 2022                
Line of credit facility, extended maturity date     Jun. 30, 2025                    
Credit facility, amount borrowed         $ 25,000,000 29,000,000              
Letter of Credit | Amended And Restated Credit Facility [Member]                          
Debt Instrument [Line Items]                          
Credit facility, maturity date   Jun. 30, 2024                      
Letter of Credit | Virginia Electric and Power Company                          
Debt Instrument [Line Items]                          
Facility Limit         2,000,000,000                
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                        
Term Loan Credit Agreement                          
Debt Instrument [Line Items]                          
Facility Limit                   $ 1,300,000,000      
Credit Facilities Maturing in December 2021 with 1 Year Automatic Renewals Through 2024 | DECP Holdings                          
Debt Instrument [Line Items]                          
Facility Limit           $ 110,000,000              
Automatic renewal period           1 year              
Letters of credit outstanding, amount         110,000,000 $ 110,000,000              
Letters of credit borrowed, amount         $ 0 $ 0              
364-Day Term Loan Facility                          
Debt Instrument [Line Items]                          
Facility Limit $ 2,500,000,000                        
Credit facility, maturity date Jan. 01, 2024                        
Credit facility, amount borrowed $ 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] 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 December 31, 2022, 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.