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Investments (Narrative) (Detail) - USD ($) $ in Millions |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
May 05, 2022 | Feb. 02, 2022 | Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Earnings from equity method investees |  |  |  | $ 80 | $ 80 |  |
Net losses from discontinued operations including noncontrolling interest | [1] |  |  | (19) | (28) |  |
Distributions received from investment |  |  |  | 76 | 73 |  |
Equity method affiliates includes cash and accrued amounts of contributions |  |  |  | 74 | 1,000 |  |
Equity method investment goodwill |  |  |  | 11 |  | $ 27 |
Income loss from continuing operations before income taxes extraordinary items noncontrolling interest |  |  |  | 928 | 1,192 |  |
Liabilities from abandonment of project |  |  |  | 217 |  |  |
Contributions to equity method affiliates |  |  |  | 15 | 977 |  |
Assets |  |  |  | 8,383 |  | 7,269 | [2]
Liabilities |  |  |  | $ 10,581 |  | 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% |  |  |  |
Initial fair value |  |  | $ 60 |  |  |  |
Dominion Energy Virginia | Held for sale |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Assets |  |  |  | 85 |  |  |
Liabilities |  |  |  | 4 |  |  |
Dominion Energy Virginia | Subsequent Event |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Percentage ownership in total units |  | 50.00% |  |  |  |  |
Total cash proceeds expected |  | $ 108 |  |  |  |  |
Expects to recognize gains totaling |  | 130 |  |  |  |  |
Expects to recognize gains totaling, after tax |  | $ 100 |  |  |  |  |
Atlantic Coast Pipeline |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Net losses from discontinued operations including noncontrolling interest |  |  |  | 2 | 8 |  |
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 |  |  |  | 115 |  | $ 113 |
Cove Point |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Distributions received from investment |  |  |  | 76 | 73 |  |
Income loss from continuing operations before income taxes extraordinary items noncontrolling interest |  |  |  | 151 | $ 138 |  |
Cove Point | Cove Point | GT&S Transaction |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Percentage of noncontrolling limited partnership interest retained |  |  |  |  |  | 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 |  |  |  | 231 |  | $ 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 |  |  |  | 219 |  | 221 |
Trading Securities |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Rabbi trust securities |  |  |  | $ 116 |  | $ 122 |
[1] | Includes income tax expense of $6 million and $7 million for the three months ended March 31, 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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