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Commitments and Contingencies (Guarantees, Surety Bonds and Letters of Credit) (Detail) | Mar. 31, 2024 USD ($)
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Guarantee Obligations [Line Items] |  |
Guarantee liability | $ 4,396,000,000 | [1],[2]
Guarantee obligations additional guarantees | 20,000,000 |
Cove Point |  |
Guarantee Obligations [Line Items] |  |
Guarantee obligations cumulative maximum exposure | 1,900,000,000 |
Surety Bond |  |
Guarantee Obligations [Line Items] |  |
Guarantee liability | 316,000,000 |
Surety Bond | Virginia Electric and Power Company |  |
Guarantee Obligations [Line Items] |  |
Guarantee liability | 213,000,000 |
Held for Sale |  |
Guarantee Obligations [Line Items] |  |
Guarantee liability | 33,000,000 |
Financial Standby Letter of Credit |  |
Guarantee Obligations [Line Items] |  |
Guarantee liability | $ 34,000,000 |
[1] | Excludes Dominion Energy’s guarantee of an offshore wind installation vessel discussed in Note 15 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2023.
[2] | In July 2016, Dominion Energy signed an agreement with a lessor to construct and lease a new corporate office property in Richmond, Virginia. The lessor provided equity and obtained financing commitments from debt investors, totaling $365 million, which funded total project costs. The project became substantially complete in August 2019 at which point the facility was available for Dominion Energy’s use and the five-year lease term commenced. At the end of the initial lease term, Dominion Energy can (i) extend the term of the lease for an additional five years, 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, up to 87% of project costs, for the difference between the project costs and sale proceeds. In December 2023, the agreement was amended to permit more than one renewal term and reduce the required term for a renewal from five years to at least one year. At March 31, 2024, no amounts have been recorded related to this guarantee.

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