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Investments (Investments Under Equity Method of Accounting) (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023
Schedule of Equity Method Investments [Line Items] |  |  |  |
Investment in equity method affiliates |  | $ 138 | $ 311 |
Align RNG, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  | 50.00% |  |
Investment in equity method affiliates |  | $ 91 | 80 |
Description |  | Renewable natural gas |  |
Dominion Energy Virginia |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  | 50.00% |  |
Investment in equity method affiliates |  | $ 27 | 172 |
Description |  | Military electric and gas |  |
Other Investment |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Investment in equity method affiliates | [1] | $ 20 | $ 59 | [2]
Ownership% | [1] | various |  |
[1] | Dominion Energy’s Consolidated Balance Sheets include a liability associated with its investment in Atlantic Coast Pipeline of $7 million and $4 million at December 31, 2024 and 2023, respectively, presented in other current liabilities. See discussion below for additional information.
[2] | Dominion Energy’s Consolidated Balance Sheets includes balances presented in assets held for sale of $43 million for December 31, 2023.

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