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Investments (Narrative) (Detail 2) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2023 | Feb. 28, 2022 | Dec. 31, 2021 | Oct. 31, 2017 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Feb. 29, 2024 | Sep. 30, 2023 | Jun. 30, 2021 | Jul. 31, 2020 | Sep. 30, 2014
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings (losses) from equity method investees |  |  |  |  |  |  |  |  | $ (26,000,000) |  | $ 21,000,000 |  | $ 15,000,000 |  |  |  |  |  |  |
Distributions received from investment |  |  |  |  |  |  |  |  | 245,000,000 |  | 355,000,000 |  | 332,000,000 |  |  |  |  |  |  |
Noncurrent Assets Held for Sale |  |  |  |  |  | $ 18,831,000,000 |  |  |  |  | 18,831,000,000 |  |  |  |  |  |  |  |  |
Income tax expense (benefit) from discontinued operations |  |  |  |  |  |  |  |  | 1,300,000,000 |  | 197,000,000 |  | 374,000,000 |  |  |  |  |  |  |
Contributions to equity method affiliates |  |  |  |  |  |  |  |  | 104,000,000 |  | 43,000,000 |  | 1,021,000,000 |  |  |  |  |  |  |
Current liabilities |  |  |  |  |  | 1,403,000,000 |  |  | 8,885,000,000 |  | 1,403,000,000 |  |  |  |  |  |  |  |  |
Facility Limit |  | $ 600,000,000 |  |  |  | 6,000,000,000 | [1] |  | 6,000,000,000 | [1] | 6,000,000,000 | [1] |  |  |  |  |  |  |  |
Goodwill write-off | [2] |  |  |  |  |  |  |  |  |  | 110,000,000 |  |  |  |  |  |  |  |  |
Income tax expense |  |  |  | $ 173,000,000 |  |  |  |  | 575,000,000 |  | 113,000,000 |  | (181,000,000) |  |  |  |  |  |  |
Impairment of certain property, plant and equipment |  |  |  |  |  |  |  |  | (307,000,000) |  | (1,401,000,000) |  | (194,000,000) |  |  |  |  |  |  |
Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment company received distribution amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 126,000,000 |  |  |  |
364 Term loan facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, outstanding amount |  | 2,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
364 Term Loan Facility One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, outstanding amount |  | 750,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,000,000,000 |  |
GT&S Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) from discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  | $ 19,000,000 |  |  |  |  |  |  |
Cove Point |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncurrent Assets Held for Sale |  |  |  |  |  | 2,700,000,000 |  |  |  |  | $ 2,700,000,000 |  |  |  |  |  |  |  |  |
Wrangler Retail Gas Holdings LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest percentage of limited partner interests |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% | 20.00% | 20.00% |  |  |  |  |
Limited partnership interest sale transaction, proceeds received |  |  |  |  |  |  |  |  |  |  |  |  | $ 127,000,000 |  |  |  |  |  |  |
Initial fair value |  |  |  | $ 23,000,000 |  |  |  |  |  |  |  |  | 23,000,000 |  |  |  |  |  |  |
Amount of gain from sale |  |  |  |  |  |  |  |  |  |  |  |  | 87,000,000 |  |  |  |  |  |  |
Goodwill write-off |  |  |  |  |  |  |  |  |  |  |  |  | 14,000,000 |  |  |  |  |  |  |
Income tax expense |  |  |  |  |  |  |  |  |  |  |  |  | $ 32,000,000 |  |  |  |  |  |  |
Wrangler Retail Gas Holdings LLC | Gas Supply, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest percentage of limited partner interests |  |  |  |  |  |  |  |  |  |  | 15.00% |  | 5.00% |  |  |  |  |  |  |
Cash consideration from sale of noncontrolling interest |  |  |  |  |  |  |  |  |  |  | $ 85,000,000 |  |  |  |  |  |  |  |  |
Amount of gain from sale |  |  |  |  |  |  |  |  |  |  | 11,000,000 |  | $ 10,000,000 |  |  |  |  |  |  |
Amount of gain from sale, after tax |  |  |  |  |  |  |  |  |  |  | 8,000,000 |  |  |  |  |  |  |  |  |
Income tax expense |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 |  |  |  |  |  |  |
Sale of interest in Cove Point |  |  |  |  |  |  |  |  |  |  |  |  | 33,000,000 |  |  |  |  |  |  |
Dominion Energy Virginia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration from sale of noncontrolling interest |  |  | $ 120,000,000 |  |  |  |  |  |  |  | 215,000,000 |  |  |  |  |  |  |  |  |
Limited partnership interest sale transaction, proceeds received |  |  | $ 60,000,000 |  |  | $ 108,000,000 |  |  |  |  | $ 108,000,000 |  |  |  |  |  |  |  |  |
Percentage ownership in total units |  |  | 50.00% |  |  | 50.00% |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |
Initial fair value |  |  | $ 60,000,000 |  |  | $ 107,000,000 |  |  |  |  | $ 107,000,000 |  |  |  |  |  |  |  |  |
Amount of gain from sale |  |  |  |  |  | 133,000,000 |  | $ 23,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Amount of gain from sale, after tax |  |  |  |  |  | $ 99,000,000 |  | $ 16,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Agreement entered date |  |  | 2022-02 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cove Point |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions received from investment |  |  |  |  |  |  |  |  | 227,000,000 |  | 344,000,000 |  | 300,000,000 |  |  |  |  |  |  |
Income tax expense (benefit) from discontinued operations |  |  |  |  |  |  |  |  | $ 31,000,000 |  | 92,000,000 |  | 60,000,000 |  |  |  |  |  |  |
Percentage of noncontrolling limited partnership interest retained | [3] |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |
Discontinued operations, interest income |  |  |  |  |  |  |  |  |  |  | (160,000,000) |  |  |  |  |  |  |  |  |
Discontinued operations, interest expense |  |  |  |  |  |  |  |  | $ 120,000,000 |  |  |  | 12,000,000 |  |  |  |  |  |  |
Cove Point | Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings (losses) from equity method investees |  |  |  |  |  |  |  |  | 218,000,000 |  | $ 277,000,000 |  | 259,000,000 |  |  |  |  |  |  |
Cove Point | GT&S Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of noncontrolling limited partnership interest retained |  |  |  |  |  | 50.00% |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |
Cove Point | Cove Point | GT&S Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of noncontrolling limited partnership interest retained |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |
Cove Point | BHE | GT&S Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration from sale of noncontrolling interest |  | $ 3,300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of noncontrolling limited partnership interest retained |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of gain from sale |  | $ 626,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of gain from sale, after tax |  | 348,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from settlement of related interest rate derivatives, fair value |  | $ 199,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cove Point | East Ohio, PSNC and Questar Gas | GT&S Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of noncontrolling limited partnership interest retained |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |
Atlantic Coast Pipeline |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings (losses) from equity method investees |  |  |  |  |  |  |  |  | $ 15,000,000 |  | $ (7,000,000) |  | (20,000,000) |  |  |  |  |  |  |
Percentage of noncontrolling limited partnership interest retained |  |  |  |  |  |  |  |  | 53.00% |  |  |  |  |  |  |  |  |  |  |
Contributions to equity method affiliates |  |  |  |  |  |  |  |  | $ 95,000,000 |  | 3,000,000 |  | 965,000,000 |  |  |  |  |  |  |
Equity in earnings (losses) on investments after tax |  |  |  |  |  |  |  |  | 11,000,000 |  | (5,000,000) |  | $ (14,000,000) |  |  |  |  |  |  |
Atlantic Coast Pipeline | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  | $ 3,400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,900,000,000 |
Credit facility, maturity date |  |  |  |  | Oct. 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Atlantic Coast Pipeline | Other Current Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current liabilities |  |  |  |  |  | $ 114,000,000 |  |  | $ 4,000,000 |  | $ 114,000,000 |  |  |  |  |  |  |  |  |
Atlantic Coast Pipeline | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00%
Percentage ownership in total units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 53.00%
Align RNG, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of noncontrolling limited partnership interest retained |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |
Impairment of certain property, plant and equipment |  |  |  |  |  |  |  |  | $ (35,000,000) |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges after tax |  |  |  |  |  |  |  |  | $ 26,000,000 |  |  |  |  |  |  |  |  |  |  |
[1] | This credit facility matures in June 2026, with the potential to be extended by the borrowers to June 2028, and can be used by the borrowers under the credit facility to support bank borrowings and the issuance of commercial paper, as well as to support up to a combined $2.0 billion of letters of credit.
[2] | See Note 3 for additional information.
[3] | 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.

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