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Long-Term Debt (Total Long Term Debt) (Parenthetical) (Detail) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Oct. 31, 2024
Jun. 30, 2024
May 31, 2024
Oct. 31, 2023
Sep. 30, 2023
Apr. 30, 2023
Jun. 30, 2022
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Feb. 23, 2024
Mar. 31, 2023
Aug. 31, 2022
Aug. 31, 2021
Debt Instrument [Line Items]                            
Debt, redeemed remaining principal outstanding               $ 144         $ 154 $ 39
Aggregate outstanding principal               $ 39,320 $ 40,206          
Weighted-average percentage interest rates               4.74% 5.69%          
March 2023                            
Debt Instrument [Line Items]                            
Debt, amount redeemed                       $ 450    
Sustainability Revolving Credit Agreement                            
Debt Instrument [Line Items]                            
Credit facility, maturity date   Jun. 30, 2025                        
Sustainability Revolving Credit Agreement | May Twenty Twenty Two                            
Debt Instrument [Line Items]                            
Debt, amount redeemed               $ 900            
Virginia Electric and Power Company                            
Debt Instrument [Line Items]                            
Aggregate outstanding principal               $ 20,627 $ 17,560          
Weighted-average percentage interest rates               4.73% 5.65%          
Dominion Energy | Sustainability Revolving Credit Agreement                            
Debt Instrument [Line Items]                            
Debt instrument, face amount               $ 900            
Dominion Energy | Junior Subordinated Notes                            
Debt Instrument [Line Items]                            
Debt, redeemed remaining principal outstanding $ 685                          
Debt instrument maturity year 2054                          
Dominion Energy | Environmental Sustainability And Social Investment Initiatives | Sustainability Revolving Credit Agreement                            
Debt Instrument [Line Items]                            
Proceeds from borrowings                   $ 450        
Repayments of borrowings     $ 450                      
Dominion Energy | General Corporate | Sustainability Revolving Credit Agreement                            
Debt Instrument [Line Items]                            
Proceeds from borrowings                 $ 450          
Repayments of borrowings       $ 450 $ 450 $ 450 $ 450              
1.45% to 7.0%, due 2024 to 2052 | Senior Notes                            
Debt Instrument [Line Items]                            
Aggregate outstanding principal [1]               $ 11,176 11,476          
Weighted-average percentage interest rates [1],[2]               4.16%            
1.45% to 7.0%, due 2024 to 2052 | Minimum | Senior Notes                            
Debt Instrument [Line Items]                            
Interest Rate               1.45%            
1.45% to 7.0%, due 2024 to 2052 | Maximum | Senior Notes                            
Debt Instrument [Line Items]                            
Interest Rate               7.00%            
3.071% due 2024 | Junior Subordinated Notes                            
Debt Instrument [Line Items]                            
Interest Rate               3.071%            
Aggregate outstanding principal               $ 0 700          
8.4%, due 2031 | Junior Subordinated Notes                            
Debt Instrument [Line Items]                            
Interest Rate               8.40%            
Aggregate outstanding principal               $ 10 10          
Weighted-average percentage interest rates [2]               8.40%            
5.75% to 7.0% due 2054 to 2055 | Junior Subordinated Notes                            
Debt Instrument [Line Items]                            
Aggregate outstanding principal [3]               $ 3,250 685          
Weighted-average percentage interest rates [2],[3]               6.82%            
5.75% to 7.0% due 2054 to 2055 | Minimum | Junior Subordinated Notes                            
Debt Instrument [Line Items]                            
Interest Rate               5.75%            
5.75% to 7.0% due 2054 to 2055 | Maximum | Junior Subordinated Notes                            
Debt Instrument [Line Items]                            
Interest Rate               7.00%            
Unsecured Senior Notes, 2.30% to 8.875%, due 2024 to 2054 | Senior Notes                            
Debt Instrument [Line Items]                            
Aggregate outstanding principal               $ 18,785 16,935          
Unsecured Senior Notes, 2.30% to 8.875%, due 2024 to 2054 | Virginia Electric and Power Company | Senior Notes                            
Debt Instrument [Line Items]                            
Aggregate outstanding principal               $ 18,785 16,935          
Weighted-average percentage interest rates [2]               4.38%            
Unsecured Senior Notes, 2.30% to 8.875%, due 2024 to 2054 | Minimum | Virginia Electric and Power Company                            
Debt Instrument [Line Items]                            
Interest Rate               2.30%            
Unsecured Senior Notes, 2.30% to 8.875%, due 2024 to 2054 | Maximum | Virginia Electric and Power Company                            
Debt Instrument [Line Items]                            
Interest Rate               8.875%            
Tax-Exempt Financings, 0.75% to 3.80%, due 2032 to 2041 | Tax-Exempt Financings                            
Debt Instrument [Line Items]                            
Aggregate outstanding principal [4]               $ 625 625          
Tax-Exempt Financings, 0.75% to 3.80%, due 2032 to 2041 | Virginia Electric and Power Company                            
Debt Instrument [Line Items]                            
Interest Rate     3.80%                      
Aggregate outstanding principal     $ 243                      
Debt, maturity month and year     2027-05                      
Tax-Exempt Financings, 0.75% to 3.80%, due 2032 to 2041 | Virginia Electric and Power Company | Tax-Exempt Financings                            
Debt Instrument [Line Items]                            
Aggregate outstanding principal [4]               $ 625 625          
Weighted-average percentage interest rates [2],[4]               2.68%            
Tax-Exempt Financings, 0.75% to 3.80%, due 2032 to 2041 | Minimum | Virginia Electric and Power Company                            
Debt Instrument [Line Items]                            
Interest Rate               0.75%            
Tax-Exempt Financings, 0.75% to 3.80%, due 2032 to 2041 | Maximum | Virginia Electric and Power Company                            
Debt Instrument [Line Items]                            
Interest Rate               3.80%            
Senior Secured Deferred Fuel Cost Bonds, 4.877% and 5.088%, due 2029 and 2033 | Tax-Exempt Financings                            
Debt Instrument [Line Items]                            
Aggregate outstanding principal               $ 1,217 0          
Senior Secured Deferred Fuel Cost Bonds, 4.877% and 5.088%, due 2029 and 2033 | Virginia Electric and Power Company | Tax-Exempt Financings                            
Debt Instrument [Line Items]                            
Aggregate outstanding principal               $ 1,217 0          
Weighted-average percentage interest rates [2]               4.94%            
Senior Secured Deferred Fuel Cost Bonds, 4.877% and 5.088%, due 2029 and 2033 | Minimum | Virginia Electric and Power Company                            
Debt Instrument [Line Items]                            
Interest Rate               4.877%            
Senior Secured Deferred Fuel Cost Bonds, 4.877% and 5.088%, due 2029 and 2033 | Maximum | Virginia Electric and Power Company                            
Debt Instrument [Line Items]                            
Interest Rate               5.088%            
First mortgage bonds, 2.30% to 6.625%, due 2028 to 2065 | Minimum | DESC                            
Debt Instrument [Line Items]                            
Interest Rate               2.30%            
First mortgage bonds, 2.30% to 6.625%, due 2028 to 2065 | Maximum | DESC                            
Debt Instrument [Line Items]                            
Interest Rate               6.625%            
3.625% and 4.00%, due 2028 and 2033 | Tax-Exempt Financings                            
Debt Instrument [Line Items]                            
Aggregate outstanding principal [5]               $ 54 54          
Weighted-average percentage interest rates [2],[5]               3.90%            
3.625% and 4.00%, due 2028 and 2033 | Minimum | Tax-Exempt Financings                            
Debt Instrument [Line Items]                            
Interest Rate               3.625%            
3.625% and 4.00%, due 2028 and 2033 | Maximum | Tax-Exempt Financings                            
Debt Instrument [Line Items]                            
Interest Rate               4.00%            
4.82%, due 2042                            
Debt Instrument [Line Items]                            
Interest Rate               4.82%            
Aggregate outstanding principal [6]               $ 0 291          
4.82%, due 2042 | Dominion Energy                            
Debt Instrument [Line Items]                            
Recorded interest expense               $ 10            
4.82%, due 2042 | Eagle Solar, LLC                            
Debt Instrument [Line Items]                            
Debt, redeemed remaining principal outstanding                     $ 279      
Tax-Exempt Financing, 3.80% due 2033                            
Debt Instrument [Line Items]                            
Interest Rate               3.80%            
Tax-Exempt Financing, 3.80% due 2033 | Tax-Exempt Financings                            
Debt Instrument [Line Items]                            
Aggregate outstanding principal [7]               $ 0 $ 27          
October 2014 Hybrids | Dominion Energy | Enhanced Junior Subordinated Notes                            
Debt Instrument [Line Items]                            
Debt, redeemed remaining principal outstanding $ 685                          
Debt instrument maturity year 2054                          
Industrial Revenue Bonds                            
Debt Instrument [Line Items]                            
Aggregate outstanding principal               $ 68            
Long term debt due within one year | Virginia Electric and Power Company                            
Debt Instrument [Line Items]                            
Weighted-average percentage interest rates               3.73%            
Long term debt due within one year | Dominion Energy                            
Debt Instrument [Line Items]                            
Weighted-average percentage interest rates               3.70%            
3.80% Peninsula Ports Authority Due in 2033 | Dominion Energy | Tax-Exempt Financings                            
Debt Instrument [Line Items]                            
Interest Rate 3.80%                          
Debt, redeemed remaining principal outstanding $ 27                          
Debt instrument maturity year 2033                          
[1] Includes debt assumed by Dominion Energy from the merger of its former CNG subsidiary.
[2] Represents weighted-average coupon rates for debt outstanding as of December 31, 2024.
[3] In October 2024, Dominion Energy redeemed all $685 million in outstanding principal amount of its October 2014 hybrids at par plus accrued interest including interest accrued at a floating rate effective October 2024. The notes would have otherwise matured in 2054.
[4] These financings relate to certain pollution control equipment at Virginia Power’s generating facilities. In May 2024, Virginia Power remarketed three series of tax-exempt bonds, with an aggregate outstanding principal of $243 million to new investors. All three bonds will bear interest at a coupon of 3.80% until May 2027, after which they will bear interest at a market rate to be determined at that time.
[5] Industrial revenue bonds totaling $68 million are secured by letters of credit that expire, subject to renewal, in the fourth quarter of 2025.
[6] Represents debt associated with Eagle Solar. In February 2024, Eagle Solar redeemed the remaining principal outstanding of $279 million. The debt which otherwise would have matured in 2042 was nonrecourse to Dominion Energy and was secured by Eagle Solar's interest in certain solar facilities. As such, these borrowings are presented within securities due within one year in Dominion Energy’s Consolidated Balance Sheets at December 31, 2023. Dominion Energy recognized a charge of $10 million during the year ended December 31, 2024 within interest expense in its Consolidated Statements of Income in connection with the early redemption of these notes.
[7] In October 2024, Dominion Energy redeemed all $27 million in outstanding principal amount of its 3.80% Peninsula Ports Authority of Virginia Coal Terminal Revenue Refunding Bonds at par plus accrued interest. The bonds would have otherwise matured in 2033.