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Investments (Investments Under Equity Method of Accounting) (Detail) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 | Sep. 30, 2023 | Dec. 31, 2021
Schedule of Equity Method Investments [Line Items] |  |  |  |
Investment in equity method affiliates |  | $ 3,012 |  | $ 2,932
Cove Point |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity Method Investment Ownership Percentage |  | 50.00% | 50.00% |
Investment in equity method affiliates | [1] | $ 2,673 |  | 2,738
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 | [2] | $ 0 |  | 0
Description |  | Gas transmission system |  |
Wrangler Retail Gas Holdings LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity Method Investment Ownership Percentage | [3] | 15.00% |  |
Investment in equity method affiliates |  | $ 0 |  | 68
Description |  | Nonregulated retail energy marketing |  |
Align RNG, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity Method Investment Ownership Percentage | [4] | 50.00% |  |
Investment in equity method affiliates | [4] | $ 103 |  | 74
Description | [4] | 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 |  | $ 176 |  | 0
Description |  | Military electric and gas |  |
Other Investment |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Investment in equity method affiliates | [5] | $ 60 |  | $ 52
Ownership% |  | various |  |
[1] | Presented in noncurrent assets held for sale in Dominion Energy's Consolidated Balance Sheets at December 31, 2022 and 2021.
[2] | Dominion Energy’s Consolidated Balance Sheets include a liability associated with its investment in Atlantic Coast Pipeline of $114 million and $113 million at December 31, 2022 and 2021, respectively, presented in other current liabilities. See discussion below for additional information.
[3] | Dominion Energy’s sold its remaining 15% ownership interest in March 2022, following a previous sale of 5% of its ownership interest in 2021. See discussion below.
[4] | Dominion Energy’s unfunded commitment to be made to Align RNG by the end of 2022 was $8 million at December 31, 2021. The commitment was fully paid in January 2022.
[5] | Includes balances presented in noncurrent assets held for sale in Dominion Energy's Consolidated Balance Sheets of $43 million and $32 million as of December 31, 2022 and 2021, respectively.

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