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Investments (Investments Under Equity Method of Accounting) (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investment in equity method affiliates |  | $ 311 | [1] | $ 3,012 |
Cove Point |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage | [2] | 50.00% |  |  |
Investment in equity method affiliates |  | $ 0 |  | 2,673 | [3]
Description |  | LNG import/export and storage facility |  |  |
Atlantic Coast Pipeline |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 53.00% |  |  |
Investment in equity method affiliates | [3] | $ 0 |  | 0 |
Description |  | Gas transmission system |  |  |
Align RNG, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 50.00% |  |  |
Investment in equity method affiliates |  | $ 80 |  | 103 |
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 |  | $ 172 |  | 176 |
Description |  | Military electric and gas |  |  |
Other Investment |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investment in equity method affiliates |  | $ 59 |  | $ 60 | [1]
Ownership% |  | various |  |  |
[1] | Dominion Energy’s Consolidated Balance Sheets includes balances presented in current assets held for sale of $43 million and noncurrent assets held for sale of $43 million, at December 31, 2023 and 2022, respectively.
[2] | Dominion Energy’s sold its remaining 50% noncontrolling limited partnership interest in September 2023. See discussion below. Presented in noncurrent assets held for sale in Dominion Energy’s Consolidated Balance Sheets at December 31, 2022.
[3] | Dominion Energy’s Consolidated Balance Sheets include a liability associated with its investment in Atlantic Coast Pipeline of $4 million and $114 million at December 31, 2023 and 2022, respectively, presented in other current liabilities. See discussion below for additional information.

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