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Investments (Narrative) (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
May 31, 2022 | Feb. 28, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Earnings from equity method investees |  |  |  | $ 83,000,000 |  | $ 65,000,000 | $ 163,000,000 | $ 145,000,000 |  |
Net losses from discontinued operations including noncontrolling interest | [1] |  |  | 1,000,000 |  | (26,000,000) | (18,000,000) | (54,000,000) |  |
Distributions received from investment |  |  |  |  |  |  | 167,000,000 | 166,000,000 |  |
Equity method affiliates includes cash and accrued amounts of contributions |  |  |  |  |  |  | 90,000,000 | 1,000,000,000.0 |  |
Equity method investment goodwill |  |  |  | 11,000,000 |  |  | 11,000,000 |  | $ 27,000,000 |
Income loss from continuing operations before income taxes extraordinary items noncontrolling interest |  |  |  | (569,000,000) |  | 222,000,000 | 359,000,000 | 1,414,000,000 |  |
Liabilities from abandonment of project |  |  |  | 225,000,000 |  |  | 225,000,000 |  |  |
Contributions to equity method affiliates |  |  |  |  |  |  | 31,000,000 | 983,000,000 |  |
Assets |  |  |  | 11,388,000,000 |  |  | 11,388,000,000 |  | 7,269,000,000 | [2]
Liabilities |  |  |  | 13,166,000,000 |  |  | $ 13,166,000,000 |  | 8,673,000,000 | [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 |  |  |  |  |  |  | $ 85,000,000 |  |  |
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 |  |  |  |  |
Agreement entered date |  |  | 2022-02 |  |  |  |  |  |  |
Limited partnership interest sale transaction, proceeds received |  |  | $ 60,000,000 |  |  |  |  |  |  |
Percentage ownership in total units |  | 50.00% | 50.00% |  |  |  |  |  |  |
Initial fair value |  |  | $ 60,000,000 |  |  |  |  |  |  |
Total cash proceeds expected |  | $ 108,000,000 |  |  |  |  |  |  |  |
Expects to recognize gains totaling |  | 130,000,000 |  |  |  |  |  |  |  |
Expects to recognize gains totaling, after tax |  | 100,000,000 |  |  |  |  |  |  |  |
Dominion Energy Virginia | Held for sale |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Assets |  |  |  | 86,000,000 |  |  | 86,000,000 |  |  |
Liabilities |  |  |  | 4,000,000 |  |  | 4,000,000 |  |  |
Atlantic Coast Pipeline |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Net losses from discontinued operations including noncontrolling interest |  |  |  |  |  |  | 4,000,000 | 22,000,000 |  |
Contributions to equity method affiliates |  |  |  |  |  |  | 0 | 965,000,000 |  |
Atlantic Coast Pipeline | Other Current Liabilities |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Liabilities from abandonment of project |  |  |  | 117,000,000 |  |  | 117,000,000 |  | 113,000,000 |
Cove Point |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Distributions received from investment |  |  |  | $ 85,000,000 |  | $ 77,000,000 | $ 161,000,000 | $ 150,000,000 |  |
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 |  |  |  | $ 158,000,000 |  | $ 136,000,000 | $ 309,000,000 | $ 274,000,000 |  |
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% |  |  |
Finite Lived Equity Method Investment Basis Difference |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Carrying amount of investment that exceeded share of underlying equity |  |  |  | $ 237,000,000 |  |  | $ 237,000,000 |  | 244,000,000 |
Equity method investment goodwill |  |  |  |  |  |  |  |  | (4,000,000) |
Finite Lived Equity Method Investment Basis Difference | Cove Point |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investment goodwill |  |  |  | 218,000,000 |  |  | 218,000,000 |  | 221,000,000 |
Trading Securities |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Rabbi trust securities |  |  |  | 111,000,000 |  |  | 111,000,000 |  | $ 122,000,000 |
2019 Series A Corporate Units |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Short-term deposit |  | 2,000,000,000.0 |  |  |  |  |  |  |  |
Allowances for credit losses recognized |  |  |  | $ 0 |  |  | $ 0 |  |  |
2019 Series A Corporate Units | Minimum |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Short-term deposit |  | 1,600,000,000 |  |  |  |  |  |  |  |
2019 Series A Corporate Units | Maximum |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Short-term deposit |  | 2,000,000,000.0 |  |  |  |  |  |  |  |
2019 Series A Corporate Units | Series A Preferred Stock |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Redemption obligation |  | $ 1,600,000,000 |  |  |  |  |  |  |  |
Preferred stock dividend rate percentage |  | 1.75% |  |  |  |  |  |  |  |
[1] | Includes income tax expense (benefit) of $(2) million and $4 million for the three months ended June 30, 2022 and 2021, respectively, and $4 million and $11 million for the six months ended June 30, 2022 and 2021, respectively.
[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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