v3.26.1
Significant Financing Transactions (Narrative) (Detail) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2026
Jun. 30, 2026
Apr. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
May 31, 2026
Mar. 31, 2026
Feb. 28, 2026
Jan. 31, 2026
Oct. 31, 2025
Sep. 30, 2025
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                      
Supplemental credit facility borrowings   200,000,000     200,000,000   200,000,000   $ 0 [1]                  
Short-term debt   $ 2,462,000,000     $ 2,462,000,000   2,462,000,000   2,457,000,000 [1]                  
Line of credit issued             $ 1,250,000,000 $ 0                    
Preferred stock shares authorized   20,000,000     20,000,000   20,000,000                      
Dividend stock         $ 11,000,000 $ 11,000,000 $ 22,000,000 22,000,000                    
Issuance of common stock             38,000,000 70,000,000                    
Issuance of common stock         $ 5,000,000 35,000,000 $ 38,000,000 $ 70,000,000                    
Period of deferral   10 years                                
Common Stock                                    
Debt Instrument [Line Items]                                    
Stock repurchased, shares             0                      
Issuance of stock (in shares)         1,000,000   1,000,000 1,000,000                    
Issuance of common stock         $ 5,000,000 35,000,000 $ 38,000,000 $ 70,000,000                    
Stock repurchase program, authorized amount   $ 900,000,000     900,000,000   900,000,000                   $ 1,000,000,000  
Various Programs                                    
Debt Instrument [Line Items]                                    
Issuance of common stock             $ 38,000,000 70,000,000                    
Issuance of stock (in shares)             1,000,000                      
Credit Facility Maturing In April 2029                                    
Debt Instrument [Line Items]                                    
Line of credit facility, maturity month and year             2029-04                      
Floating Rate Demand Notes                                    
Debt Instrument [Line Items]                                    
Short-term debt   375,000,000     375,000,000   $ 375,000,000   422,000,000                  
Floating Rate Demand Notes | Shelf Registration for Sale of Demand Notes                                    
Debt Instrument [Line Items]                                    
Facility Limit                                   $ 3,000,000,000
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   992,000,000     992,000,000   992,000,000   $ 675,000,000 [3]                  
Issuance of common stock   450,000,000   $ 2,100,000,000     450,000,000 2,100,000,000                    
Issuance of common stock   $ 3,600,000,000     $ 450,000,000 $ 2,100,000,000 $ 450,000,000 $ 2,100,000,000                    
Virginia Electric and Power Company | Common Stock                                    
Debt Instrument [Line Items]                                    
Issuance of stock (in shares)   6,046   30,006 6,000 30,000 6,000 30,000                    
Issuance of common stock         $ 450,000,000 $ 2,100,000,000 $ 450,000,000 $ 2,100,000,000                    
Virginia Electric and Power Company | Senior Notes Due in 2036                                    
Debt Instrument [Line Items]                                    
Debt instrument maturity year             2036                      
Interest Rate                     4.95%              
Debt issued amount                     $ 1,300,000,000              
Virginia Electric and Power Company | Senior Notes Due in 2056                                    
Debt Instrument [Line Items]                                    
Debt instrument maturity year             2056                      
Interest Rate                     5.70%              
Debt issued amount                     $ 850,000,000              
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 $ 22,000,000 $ 22,000,000                    
Preferred stock dividend per share         $ 10.875 $ 10.875 $ 21.75 $ 21.75                    
Dominion Energy | Senior Notes Due in 2036                                    
Debt Instrument [Line Items]                                    
Debt instrument maturity year             2036                      
Interest Rate   5.35%     5.35%   5.35%                      
Debt issued amount   $ 825,000,000     $ 825,000,000   $ 825,000,000                      
Dominion Energy | Series A JSN                                    
Debt Instrument [Line Items]                                    
Debt instrument maturity year   2056                                
Interest Rate   6.15%     6.15%   6.15%                      
Interest reset period   5 years                                
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]   us-gaap:UsTreasuryUstInterestRateMember                                
Interest rate spread   1.869%                                
Interest rate minimum reset   6.15%     6.15%   6.15%                      
Issuance of subordinate notes   $ 1,000,000,000                                
Dominion Energy | Series B JSN                                    
Debt Instrument [Line Items]                                    
Debt instrument maturity year   2056                                
Interest Rate   6.25%     6.25%   6.25%                      
Interest reset period   5 years                                
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]   us-gaap:UsTreasuryUstInterestRateMember                                
Interest rate spread   1.702%                                
Interest rate minimum reset   6.25%     6.25%   6.25%                      
Issuance of subordinate notes   $ 500,000,000                                
Minimum | Dominion Energy                                    
Debt Instrument [Line Items]                                    
Dividends per share   $ 0.6675     $ 0.6675   $ 0.6675       $ 0.6675              
Maximum | Various Programs                                    
Debt Instrument [Line Items]                                    
Issuance of stock (in shares)               1,000,000                    
Junior Subordinated Debt | Dominion Energy                                    
Debt Instrument [Line Items]                                    
Issuance of subordinate notes   $ 1,500,000,000                                
May 2024 At-the-Market Program [Member] | Forward Sale Agreements                                    
Debt Instrument [Line Items]                                    
Forward sale agreements, number of shares of common stock to be settled                             2,400,000      
Weighted average initial forward price                             $ 59.91      
February 2025 At-the-Market Program [Member] | Forward Sale Agreements                                    
Debt Instrument [Line Items]                                    
Forward sale agreements, number of shares of common stock to be settled   7,900,000   11,000,000 7,900,000 11,000,000 7,900,000 11,000,000     3,200,000              
Weighted average initial forward price   $ 67.88   $ 55.83 $ 67.88 $ 55.83 $ 67.88 $ 55.83     $ 62.96              
February 2025 At-the-Market Program [Member] | 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      
Weighted average initial forward price                             $ 61.11      
February 2025 At-the-Market Program [Member] | Aggregate Forward Sale Agreement                                    
Debt Instrument [Line Items]                                    
Facility Limit                           $ 1,800,000,000        
Forward sale agreements, number of shares of common stock to be settled                 5,400,000                  
February 2025 At-the-Market Program [Member] | Weighted Average | Aggregate Forward Sale Agreement                                    
Debt Instrument [Line Items]                                    
Weighted average initial forward price                 $ 60.44                  
Joint Revolving Credit Facility                                    
Debt Instrument [Line Items]                                    
Facility Limit     $ 7,000,000,000                              
Letter of Credit                                    
Debt Instrument [Line Items]                                    
Facility Limit                               $ 100,000,000    
Letters of credit issued and outstanding   $ 26,000,000     $ 26,000,000   $ 26,000,000   $ 26,000,000                  
Letter of Credit | Credit Facility in June 2024                                    
Debt Instrument [Line Items]                                    
Facility Limit   275,000,000     275,000,000   275,000,000                      
Letters of credit issued and outstanding   101,000,000     101,000,000   101,000,000   102,000,000                  
Letter of Credit | Credit Facility In January 2026                                    
Debt Instrument [Line Items]                                    
Facility Limit                         $ 250,000,000          
Letter of Credit | Credit Facility One In July 2026 | Subsequent Event                                    
Debt Instrument [Line Items]                                    
Facility Limit $ 450,000,000                                  
Letter of Credit | Credit Facility Two In July 2026 | Subsequent Event                                    
Debt Instrument [Line Items]                                    
Facility Limit 250,000,000                                  
Letter of Credit | Credit Facility One in September 2025                                    
Debt Instrument [Line Items]                                    
Facility Limit                             $ 500,000,000      
Letter of Credit | Dominion Energy South Carolina | Credit Facility in June 2024                                    
Debt Instrument [Line Items]                                    
Letters of credit issued and outstanding   101,000,000     101,000,000   101,000,000   102,000,000                  
Letter of Credit | Dominion Energy South Carolina | Credit Facility In January 2026                                    
Debt Instrument [Line Items]                                    
Facility Limit                         50,000,000          
Letter of Credit | Dominion Energy South Carolina | Credit Facility One In July 2026 | Subsequent Event                                    
Debt Instrument [Line Items]                                    
Facility Limit 50,000,000                                  
Letter of Credit | Dominion Energy South Carolina | Credit Facility One in September 2025                                    
Debt Instrument [Line Items]                                    
Facility Limit                             100,000,000      
Letters of credit issued and outstanding   351,000,000     351,000,000   351,000,000   379,000,000                  
Letter of Credit | Virginia Electric and Power Company                                    
Debt Instrument [Line Items]                                    
Facility Limit   450,000,000     450,000,000   450,000,000                      
Letters of credit issued and outstanding   200,000,000     200,000,000   200,000,000   100,000,000                  
Line of credit issued             422,000,000   281,000,000                  
Letter of Credit | Virginia Electric and Power Company | Credit Facility in June 2024                                    
Debt Instrument [Line Items]                                    
Letters of credit issued and outstanding   79,000,000     79,000,000   79,000,000   81,000,000                  
Letter of Credit | Virginia Electric and Power Company | Credit Facility in January 2025                                    
Debt Instrument [Line Items]                                    
Facility Limit                         200,000,000          
Letter of Credit | Virginia Electric and Power Company | Credit Facility In January 2026                                    
Debt Instrument [Line Items]                                    
Facility Limit                         200,000,000          
Letters of credit issued and outstanding   200,000,000     200,000,000   200,000,000   100,000,000                  
Letter of Credit | Virginia Electric and Power Company | Credit Facility One In July 2026                                    
Debt Instrument [Line Items]                                    
Facility Limit                         $ 400,000,000          
Letter of Credit | Virginia Electric and Power Company | Credit Facility One In July 2026 | Subsequent Event                                    
Debt Instrument [Line Items]                                    
Facility Limit 400,000,000                                  
Letter of Credit | Virginia Electric and Power Company | Credit Facility One in September 2025                                    
Debt Instrument [Line Items]                                    
Facility Limit                             400,000,000      
Letters of credit issued and outstanding   351,000,000     351,000,000   351,000,000   379,000,000                  
Letter of Credit | Virginia Electric and Power Company | Credit Facility Two in September 2025                                    
Debt Instrument [Line Items]                                    
Facility Limit   1,200,000,000     1,200,000,000   1,200,000,000   1,000,000,000           $ 2,000,000,000      
Letter of Credit | Dominion Energy                                    
Debt Instrument [Line Items]                                    
Letters of credit issued and outstanding   250,000,000     250,000,000   250,000,000   150,000,000                  
Letter of Credit | Maximum | Virginia Electric and Power Company                                    
Debt Instrument [Line Items]                                    
Facility Limit   3,000,000,000     3,000,000,000   3,000,000,000                      
Supplemental Revolving Credit Facility                                    
Debt Instrument [Line Items]                                    
Facility Limit [4]   1,000,000,000     1,000,000,000   1,000,000,000                      
Supplemental credit facility borrowings   200,000,000     200,000,000   $ 200,000,000   $ 0                  
Line of credit facility, maturity month and year     2028-04                              
Sustainability Revolving Credit Facility                                    
Debt Instrument [Line Items]                                    
Facility Limit                   $ 500,000,000   $ 500,000,000            
Repayment of supplemental credit facility borrowings   300,000,000                                
Sustainability Revolving Credit Facility | Credit Facility Maturing In April 2028                                    
Debt Instrument [Line Items]                                    
Line of credit facility, maturity month and year             2028-04                      
364 Day Term Loan Facility                                    
Debt Instrument [Line Items]                                    
Facility Limit                       $ 1,300,000,000            
Letters of credit issued and outstanding   $ 1,300,000,000     $ 1,300,000,000   $ 1,300,000,000                      
Line of credit issued             $ 1,300,000,000                      
364 Day Term Loan Facility | Subsequent Event                                    
Debt Instrument [Line Items]                                    
Repayments of borrowings $ 300,000,000                                  
[1] Dominion Energy’s Consolidated Balance Sheet at December 31, 2025 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. At June 30, 2026, the sub-limit for Virginia Power was $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 2031 in accordance with the extension exercised by the borrowers in April 2026, with the potential to be further extended by the borrowers to April 2032, and 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, for working capital and other general corporate purposes.
[3] Virginia Power’s Consolidated Balance Sheet at December 31, 2025 has been derived from the audited Consolidated Balance Sheet at that date.
[4] This credit facility, entered into in April 2026 with certain lenders, matures in April 2028, with the potential to be extended by Dominion Energy to April 2029, contains a maximum allowed total debt to total capital ratio consistent with such allowed ratio under Dominion Energy’s joint revolving credit facility and can be used to support bank borrowings and the issuance of commercial paper.