v3.26.3
Regulatory Assets and Liabilities (Schedule of Regulatory Assets) (Detail) - USD ($)
$ in Millions
 1 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2026
Jun. 30, 2026
Sep. 30, 2026
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Regulatory Assets [Line Items]            
Regulatory assets-current [1] $ 2,035   $ 2,035   $ 1,380 [2]  
Regulatory assets-noncurrent [1] 8,531   8,531   8,276 [2]  
Total regulatory assets 10,566   10,566   9,656  
Virginia Electric and Power Company            
Regulatory Assets [Line Items]            
Regulatory assets-current [3] 1,602   1,602   1,110 [4]  
Regulatory assets-noncurrent [3] 4,669   4,669   4,526 [4]  
Total regulatory assets 6,271   6,271   5,636  
Future decommissioning activities     $ 15   4  
Virginia Electric and Power Company | Virginia Regulation | Annual Fuel Factor            
Regulatory Assets [Line Items]            
Estimated under-recovered fuel balances   $ 1,100   $ 1,000   $ 1,000
Virginia Electric and Power Company | Virginia Regulation | Second Option | Annual Fuel Factor            
Regulatory Assets [Line Items]            
Estimated under-recovered fuel balances 932     $ 1,000    
Weighted Average            
Regulatory Assets [Line Items]            
Weighted average useful life     24 years      
Weighted Average | Virginia Electric and Power Company            
Regulatory Assets [Line Items]            
Weighted average useful life     23 years      
SCANA            
Regulatory Assets [Line Items]            
Electric service customers over period     20 years      
Deferred Cost of Fuel Used in Electric Generation            
Regulatory Assets [Line Items]            
Regulatory assets-current [5] 1,169   $ 1,169   213  
Regulatory assets-noncurrent [5] 157   157   391  
Deferred Cost of Fuel Used in Electric Generation | Virginia Electric and Power Company            
Regulatory Assets [Line Items]            
Regulatory assets-current [5] 997   997   174  
Regulatory assets-noncurrent [5] 157   157   391  
Securitized Cost of Fuel Used in Electric Generation            
Regulatory Assets [Line Items]            
Regulatory assets-current [6] 130   130   125  
Regulatory assets-noncurrent [6] 733   733   868  
Securitized Cost of Fuel Used in Electric Generation | Virginia Electric and Power Company            
Regulatory Assets [Line Items]            
Regulatory assets-current [6] 130   130   125  
Regulatory assets-noncurrent [6] 733   733   868  
Riders OSW and CE            
Regulatory Assets [Line Items]            
Regulatory assets-current [7] 62   62   23  
Regulatory assets-noncurrent [7] 394   394   287  
Riders OSW and CE | Virginia Electric and Power Company            
Regulatory Assets [Line Items]            
Regulatory assets-current [7] 62   62   23  
Regulatory assets-noncurrent [7] 394   394   287  
Other Deferred Rider Costs for Virginia Electric Utility            
Regulatory Assets [Line Items]            
Regulatory assets-current [8] 151   151   445  
Regulatory assets-noncurrent [8] 671   671   338  
Other Deferred Rider Costs for Virginia Electric Utility | Virginia Electric and Power Company            
Regulatory Assets [Line Items]            
Regulatory assets-current [8] 151   151   445  
Regulatory assets-noncurrent [8] 671   671   338  
Ash Pond and Landfill Closure Costs            
Regulatory Assets [Line Items]            
Regulatory assets-current [9] 77   $ 77   164  
Regulatory assets expected collection period commencing year     2021      
Ash Pond and Landfill Closure Costs | Virginia Electric and Power Company            
Regulatory Assets [Line Items]            
Regulatory assets-current [9] 77   $ 77   164  
Ash Pond and Landfill Closure Costs | Minimum            
Regulatory Assets [Line Items]            
Regulatory assets amounts expected collection period     15 years      
Ash Pond and Landfill Closure Costs | Maximum            
Regulatory Assets [Line Items]            
Regulatory assets amounts expected collection period     18 years      
Deferred Nuclear Refueling Outage Costs            
Regulatory Assets [Line Items]            
Regulatory assets-current [10] 99   $ 99   101  
Deferred Nuclear Refueling Outage Costs | Virginia Electric and Power Company            
Regulatory Assets [Line Items]            
Regulatory assets-current [10] 99   99   101  
NND Project Costs            
Regulatory Assets [Line Items]            
Regulatory assets-current [11] 138   138   138  
Regulatory assets-noncurrent [11] 1,569   1,569   1,672  
CCR Remediation, Ash Pond and Landfill Closure Cost            
Regulatory Assets [Line Items]            
Regulatory assets-noncurrent [9] 3,132   3,132   2,868  
CCR Remediation, Ash Pond and Landfill Closure Cost | Virginia Electric and Power Company            
Regulatory Assets [Line Items]            
Regulatory assets-noncurrent [9] 2,565   2,565   2,510  
Other            
Regulatory Assets [Line Items]            
Regulatory assets-current 209   209   171  
Regulatory assets-noncurrent 798   798   775  
Other | Virginia Electric and Power Company            
Regulatory Assets [Line Items]            
Regulatory assets-current 86   86   78  
Regulatory assets-noncurrent 149   149   132  
Unrecognized Pension and Other Postretirement Benefit Costs            
Regulatory Assets [Line Items]            
Regulatory assets-noncurrent [12] 503   503   527  
Unrecognized Pension and Other Postretirement Benefit Costs | Virginia Electric and Power Company            
Regulatory Assets [Line Items]            
Regulatory assets-noncurrent [12]         0  
Interest Rate Hedges            
Regulatory Assets [Line Items]            
Regulatory assets-noncurrent [13] 165   165   165  
Interest Rate Hedges | Virginia Electric and Power Company            
Regulatory Assets [Line Items]            
Regulatory assets-noncurrent [13] 0   0   0  
AROs and Related Funding            
Regulatory Assets [Line Items]            
Regulatory assets-noncurrent [14] $ 409   $ 409   $ 385  
Amortization period for deferred costs 105 years   105 years      
Deferred Project Costs | Maximum            
Regulatory Assets [Line Items]            
Amortization period for deferred costs 18 months   18 months      
[1] See Note 14 for amounts attributable to VIEs.
[2] Dominion Energy’s Consolidated Balance Sheet at December 31, 2025 has been derived from the audited Consolidated Balance Sheet at that date.
[3] See Note 14 for amounts attributable to VIEs.
[4] Virginia Power’s Consolidated Balance Sheet at December 31, 2025 has been derived from the audited Consolidated Balance Sheet at that date.
[5] Reflects deferred fuel expenses as well as, beginning in June 2025, deferred electric capacity expenses for the Virginia and North Carolina jurisdictions of Virginia Power’s electric generation operations. Additionally, Dominion Energy includes deferred fuel expenses for the South Carolina jurisdiction of its electric generation operations. In September 2026, the Virginia Commission issued an order permitting Virginia Power to securitize $932 million of under-recovered fuel costs for its Virginia service territory. See Note 12 for additional information.
[6] Reflects under-recovered fuel costs for Virginia Power’s Virginia service territory securitized through the issuance of bonds by VPFS in February 2024, which are being amortized into electric fuel and other energy-related purchases. See Note 18 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2025 for additional information.
[7] Deferred balances for Riders OSW and CE include amounts for shortfall or excess in energy sales, capacity revenue, renewable energy credits and production tax credits as such customer benefit amounts are included as a component, including an equity return, of the revenue requirements associated with each rate adjustment clause. In addition, the deferred Rider OSW balance at September 30, 2026 and December 31, 2025 includes $15 million and $4 million, respectively, for future decommissioning activities.
[8] Reflects deferrals under Virginia Power’s electric transmission FERC formula rate and the deferral of costs associated with certain current and prospective rider projects.
[9] Primarily reflects legislation in Virginia which requires any CCR asset located at certain Virginia Power stations to be closed by removing the CCR to an approved landfill or through beneficial reuse. These deferred costs are expected to be collected over a period between 15 and 18 years commencing December 2021 through Rider CCR. Virginia Power is entitled to collect carrying costs on uncollected expenditures once expenditures have been made. In addition, the balance reflects amounts related to the EPA’s May 2024 final rule concerning CCR as discussed in Note 14 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2025.
[10] Primarily reflects deferred operation and maintenance costs at Virginia Power incurred in connection with the refueling of any nuclear-powered generating plant as required by Virginia legislation. Virginia Power deferred costs will be amortized over the refueling cycle, not to exceed 18 months.
[11] Reflects expenditures by DESC associated with the NND Project, which pursuant to the SCANA Merger Approval Order, will be recovered from DESC electric service customers over a 20-year period ending in 2039.
[12] Represents unrecognized pension and other postretirement employee benefit costs expected to be recovered or refunded through future rates generally over the expected remaining service period of plan participants by certain of Dominion Energy’s rate-regulated subsidiaries.
[13] Reflects interest rate hedges recoverable from or refundable to customers. Certain of these instruments are settled and any related payments are being amortized into interest expense over the life of the related debt, which has a weighted-average useful life of approximately 24 years and 23 years for Dominion Energy and Virginia Power, respectively, at September 30, 2026.
[14] Represents uncollected costs, including deferred depreciation and accretion expense, related to legal obligations associated with the future retirement of generation, transmission and distribution properties. The AROs primarily relate to DESC’s electric generating facilities, including Summer, and are expected to be recovered over the related property lives and periods of decommissioning which may range up to approximately 105 years.