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Commitments and Contingencies (Schedule of Subsidiary Guarantees) (Detail) | Sep. 30, 2025 USD ($)
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Guarantee Obligations [Line Items] |  |
Maximum Exposure | $ 3,057,000,000 | [1],[2]
Commodity Transactions |  |
Guarantee Obligations [Line Items] |  |
Maximum Exposure | 2,439,000,000 | [3]
Nuclear Obligations |  |
Guarantee Obligations [Line Items] |  |
Maximum Exposure | 181,000,000 | [4]
Solar |  |
Guarantee Obligations [Line Items] |  |
Maximum Exposure | 85,000,000 | [5]
Other |  |
Guarantee Obligations [Line Items] |  |
Maximum Exposure | $ 352,000,000 | [6]
[1] | Excludes Dominion Energy’s guarantee of an offshore wind installation vessel discussed in Note 14.
[2] | In July 2016, Dominion Energy signed an agreement with a lessor to construct and lease a new corporate office property in Richmond, Virginia and commenced an initial five-year lease term in August 2019, with certain options at the end of the term to extend the lease, purchase or sell the property. In July 2024, the agreement was amended to reflect Dominion Energy’s election to extend the lease term through July 2029. At the end of the lease term, Dominion Energy can (i) extend the term of the lease for at least one year, subject to the approval of the participants, at current market terms, (ii) purchase the property for an amount equal to the project costs or (iii) subject to certain terms and conditions, sell the property on behalf of the lessor to a third party using commercially reasonable efforts to obtain the highest cash purchase price for the property. If the project is sold and the proceeds from the sale are insufficient to repay the investors for the project costs, Dominion Energy may be required to make a payment to the lessor equal to the recorded lease balance.
[3] | Guarantees related to commodity commitments of certain subsidiaries. These guarantees were provided to counterparties in order to facilitate physical and financial transaction related commodities and services.
[4] | Guarantees primarily related to certain DGI subsidiaries regarding all aspects of running a nuclear facility.
[5] | Includes guarantees to facilitate the development of solar projects.
[6] | Guarantees related to other miscellaneous contractual obligations such as leases, environmental obligations, construction projects and insurance programs. Due to the uncertainty of workers’ compensation claims, the parental guarantee has no stated limit.

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