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Investments (Narrative) (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2023 | May 31, 2022 | Mar. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Aug. 31, 2022 | Mar. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings from equity method investees |  |  |  |  |  |  |  |  |  | $ 7,000,000 |  | $ 16,000,000 |  |
Net earnings (losses) from discontinued operations including noncontrolling interest | [1] |  |  |  | $ 554,000,000 |  | $ (152,000,000) |  |  | 105,000,000 |  | (775,000,000) |  |
Distributions received from investment |  |  |  |  |  |  |  |  |  | 241,000,000 |  | 268,000,000 |  |
Equity method affiliates includes cash and accrued amounts of contributions |  |  |  |  |  |  |  |  |  | 79,000,000 |  | 93,000,000 |  |
Equity method investment goodwill |  |  |  |  | 9,000,000 |  |  |  |  | 9,000,000 |  |  | $ 9,000,000 |
Liabilities from abandonment of project |  |  |  |  | 8,331,000,000 |  |  |  |  | 8,331,000,000 |  |  | 1,398,000,000 | [2]
Contributions to equity method affiliates |  |  |  |  |  |  |  |  |  | 79,000,000 |  | 34,000,000 |  |
Income tax expense (benefit) from discontinued operations |  |  |  |  | 1,200,000,000 |  | 53,000,000 |  |  | 1,300,000,000 |  | 185,000,000 |  |
Facility Limit |  | $ 600,000,000 |  |  | 6,000,000,000 | [3] |  |  |  | 6,000,000,000 | [3] |  |  |
Noncurrent assets held for sale |  |  |  |  | $ 0 |  |  |  |  | $ 0 |  |  | 18,802,000,000 | [2]
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 |  |  |  |  |  |  |  |  |  |  |  |
2019 Series A Corporate Units |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term deposit |  |  | $ 2,000,000,000 |  |  |  |  |  |  |  |  |  |  |
Cove Point |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncurrent assets held for sale |  |  |  |  |  |  |  |  |  |  |  |  | 2,700,000,000 |
Wrangler Retail Gas Holdings LLC | Gas Supply, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest percentage of limited partner interests |  |  |  |  |  |  |  |  | 15.00% |  |  |  |  |
Cash consideration from sale of noncontrolling interest |  |  |  |  |  |  |  |  | $ 85,000,000 |  |  |  |  |
Amount of gain from sale |  |  |  |  |  |  |  |  | 11,000,000 |  |  |  |  |
Amount of gain from sale, after tax |  |  |  |  |  |  |  |  | 8,000,000 |  |  |  |  |
Dominion Energy Virginia |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration from sale of noncontrolling interest |  |  |  | $ 120,000,000 |  |  |  |  |  |  |  |  |  |
Amount of gain from sale |  |  |  |  |  |  |  |  | 23,000,000 |  |  |  |  |
Amount of gain from sale, after tax |  |  |  |  |  |  |  |  | 16,000,000 |  |  |  |  |
Limited partnership interest sale transaction, proceeds received |  |  |  | $ 60,000,000 |  |  |  |  | $ 60,000,000 |  |  |  |  |
Percentage ownership in total units |  |  |  | 50.00% | 50.00% |  |  |  | 50.00% | 50.00% |  |  |  |
Initial fair value |  |  |  | $ 60,000,000 |  |  |  |  | $ 60,000,000 |  |  |  |  |
Atlantic Coast Pipeline |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings from equity method investees |  |  |  |  |  |  |  |  |  | $ 16,000,000 |  | (6,000,000) |  |
Net earnings (losses) from discontinued operations including noncontrolling interest |  |  |  |  |  |  |  |  |  | (235,000,000) |  | (233,000,000) |  |
Contributions to equity method affiliates |  |  |  |  |  |  |  |  |  | 70,000,000 |  | 0 |  |
Atlantic Coast Pipeline | Other Current Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities from abandonment of project |  |  |  |  | $ 25,000,000 |  |  |  |  | 25,000,000 |  |  | $ 114,000,000 |
Cove Point |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions received from investment |  |  |  |  | 49,000,000 |  | 98,000,000 |  |  | $ 227,000,000 |  | 259,000,000 |  |
Transportation and storage services agreement period |  |  |  |  |  |  |  |  |  | 20 years |  |  |  |
Discontinued operations, interest expense |  |  |  |  | 69,000,000 |  |  |  |  | $ 120,000,000 |  |  |  |
Discontinued operations, interest income |  |  |  |  |  |  | (65,000,000) |  |  |  |  | (205,000,000) |  |
Income tax expense (benefit) from discontinued operations |  |  |  |  | 7,000,000 |  | 32,000,000 |  |  | 31,000,000 |  | 93,000,000 |  |
Cove Point | Discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings from equity method investees |  |  |  |  | $ 52,000,000 |  | $ 91,000,000 |  |  | $ 218,000,000 |  | $ 238,000,000 |  |
Cove Point | Cove Point | GT&S Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of noncontrolling limited partnership interest retained |  |  |  |  | 50.00% |  |  |  |  | 50.00% |  |  | 50.00% |
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% |  |  |  |  | 50.00% |  |  |  |
Cove Point | BHE | GT&S Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of noncontrolling limited partnership interest retained |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration from sale of noncontrolling interest |  | $ 3,300,000,000 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |
Finite Lived Equity Method Investment Basis Difference |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount of investment that exceeded share of underlying equity |  |  |  |  | $ 12,000,000 |  |  |  |  | $ 12,000,000 |  |  | $ 223,000,000 |
Equity method investment goodwill |  |  |  |  | 3,000,000 |  |  |  |  | 3,000,000 |  |  | (1,000,000) |
Finite Lived Equity Method Investment Basis Difference | Cove Point |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment goodwill |  |  |  |  |  |  |  |  |  |  |  |  | 215,000,000 |
Trading Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rabbi trust securities |  |  |  |  | $ 119,000,000 |  |  |  |  | $ 119,000,000 |  |  | $ 111,000,000 |
Minimum | 2019 Series A Corporate Units |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term deposit |  |  | 1,600,000,000 |  |  |  |  |  |  |  |  |  |  |
Maximum | 2019 Series A Corporate Units |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term deposit |  |  | 2,000,000,000 |  |  |  |  |  |  |  |  |  |  |
Series A Preferred Stock | 2019 Series A Corporate Units |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption obligation |  |  | $ 1,600,000,000 |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividend rate percentage |  |  | 1.75% |  |  |  |  | 1.75% |  |  |  |  |  |
[1] | Includes income tax expense of $1.2 billion and $53 million for the three months ended September 30, 2023 and 2022, respectively, and $1.3 billion and $185 million for the nine months ended September 30, 2023 and 2022, respectively.
[2] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2022 has been derived from the audited Consolidated Balance Sheet at that date and recast for certain events as discussed in Note 1.
[3] | 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.

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