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Investments (Narrative) (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
May 31, 2022 | Feb. 28, 2022 | Sep. 30, 2022 | Aug. 31, 2022 | Mar. 31, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earnings from equity method investees |  |  |  | $ 92 |  |  | $ 69 | $ 255 | $ 214 |  |
Net losses from discontinued operations including noncontrolling interest | [1] |  |  | 3 |  |  | (65) | (15) | (119) |  |
Distributions received from investment |  |  |  |  |  |  |  | 268 | 263 |  |
Equity method affiliates includes cash and accrued amounts of contributions |  |  |  |  |  |  |  | 93 | 1,000 |  |
Equity method investment goodwill |  |  |  | 11 |  |  |  | 11 |  | $ 27 |
Income loss from continuing operations before income taxes extraordinary items noncontrolling interest |  |  |  | 905 |  |  | 636 | 1,264 | 2,050 |  |
Contributions to equity method affiliates |  |  |  |  |  |  |  | 34 | 1,006 |  |
Assets |  |  |  | 8,699 |  |  |  | 8,699 |  | 7,269 | [2]
Liabilities |  |  |  | 12,172 |  |  |  | $ 12,172 |  | 8,673 | [2]
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 |  |  |
Amount of gain from sale |  |  |  |  |  |  |  | 11 |  |  |
Amount of gain from sale, after tax |  |  |  |  |  |  |  | 8 |  |  |
Dominion Energy Virginia |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash consideration from sale of noncontrolling interest |  |  | $ 120 |  |  |  |  |  |  |  |
Amount of gain from sale |  |  |  |  |  | $ 23 |  |  |  |  |
Amount of gain from sale, after tax |  |  |  |  |  | $ 16 |  |  |  |  |
Agreement entered date |  |  | 2022-02 |  |  |  |  |  |  |  |
Limited partnership interest sale transaction, proceeds received |  |  | $ 60 |  |  |  |  |  |  |  |
Percentage ownership in total units |  | 50.00% | 50.00% |  |  |  |  |  |  |  |
Initial fair value |  |  | $ 60 |  |  |  |  |  |  |  |
Total cash proceeds expected |  | $ 108 |  |  |  |  |  |  |  |  |
Expects to recognize gains totaling |  | 130 |  |  |  |  |  |  |  |  |
Expects to recognize gains totaling, after tax |  | 100 |  |  |  |  |  |  |  |  |
Dominion Energy Virginia | Held for sale |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  | 83 |  |  |  | 83 |  |  |
Liabilities |  |  |  | 4 |  |  |  | 4 |  |  |
Atlantic Coast Pipeline |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net losses from discontinued operations including noncontrolling interest |  |  |  |  |  |  |  | 6 | 19 |  |
Contributions to equity method affiliates |  |  |  |  |  |  |  | 0 | 965 |  |
Atlantic Coast Pipeline | Other Current Liabilities |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Liabilities from abandonment of project |  |  |  | 119 |  |  |  | 119 |  | 113 |
Cove Point |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Distributions received from investment |  |  |  | $ 98 |  |  | $ 85 | $ 259 | $ 235 |  |
Percentage of Income loss from continuing operations before income taxes extraordinary items noncontrolling interest |  |  |  | 100.00% |  |  | 100.00% | 100.00% | 100.00% |  |
Income loss from continuing operations before income taxes extraordinary items noncontrolling interest |  |  |  | $ 197 |  |  | $ 136 | $ 506 | $ 410 |  |
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% |  |  |
Finite Lived Equity Method Investment Basis Difference |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying amount of investment that exceeded share of underlying equity |  |  |  | $ 227 |  |  |  | $ 227 |  | 244 |
Equity method investment goodwill |  |  |  |  |  |  |  |  |  | (4) |
Finite Lived Equity Method Investment Basis Difference | Cove Point |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity method investment goodwill |  |  |  | 216 |  |  |  | 216 |  | 221 |
Trading Securities |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Rabbi trust securities |  |  |  | $ 109 |  |  |  | $ 109 |  | $ 122 |
2019 Series A Corporate Units |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short-term deposit |  | 2,000 |  |  |  |  |  |  |  |  |
2019 Series A Corporate Units | Minimum |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short-term deposit |  | 1,600 |  |  |  |  |  |  |  |  |
2019 Series A Corporate Units | Maximum |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short-term deposit |  | 2,000 |  |  |  |  |  |  |  |  |
2019 Series A Corporate Units | Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Redemption obligation |  | $ 1,600 |  |  |  |  |  |  |  |  |
Preferred stock dividend rate percentage |  | 1.75% |  |  | 1.75% |  |  |  |  |  |
[1] | Includes income tax expense (benefit) of $(6) million for the three months ended September 30, 2021 and $4 million and $5 million for the nine months ended September 30, 2022 and 2021, respectively. There were no such amounts recorded during the three months ended September 30, 2022.
[2] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2021 has been derived from the audited Consolidated Balance Sheet at that date.

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