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Investments (Investments Under Equity Method of Accounting) (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Schedule of Equity Method Investments [Line Items] |  |  |  |
Investment in equity method affiliates |  | $ 2,934 | [1] | $ 1,334
Cove Point |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership% | [2] | 50.00% |  |
Investment in equity method affiliates |  | $ 2,784 |  | 0
Description |  | LNG import/export and storage facility |  |
Atlantic Coast Pipeline |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership% | [3] | 53.00% |  |
Investment in equity method affiliates |  | $ 0 | [4] | 1,123
Description |  | Gas transmission system |  |
Wrangler Retail Gas Holdings LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership% |  | 20.00% |  |
Investment in equity method affiliates |  | $ 74 |  | 77
Description |  | Nonregulated retail energy marketing |  |
Fowler Ridge |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership% | [5] | 50.00% |  |
Investment in equity method affiliates |  | $ 0 |  | 74
Description |  | Wind-powered nonregulated generation facility |  |
Other Investment |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Investment in equity method affiliates | [6] | $ 76 |  | $ 60
Ownership% | [6] | various |  |
[1] | Excludes liability to Atlantic Coast Pipeline.
[2] | Effective November 2020, following the completion of the GT&S Transaction, Dominion Energy began accounting for its 50% noncontrolling interest in Cove Point as an equity method investment. See discussion below and Note 3 for additional information.
[3] | Dominion Energy owned 53% and 48% of Atlantic Coast Pipeline at December 31, 2020 and 2019, respectively. See discussion below for additional information.
[4] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2020 includes a $1.1 billion liability associated with its investment in Atlantic Coast Pipeline. See discussion below for additional information.
[5] | Dominion Energy sold its 50% noncontrolling interest in Fowler Ridge in September 2020. See discussion below for additional information.
[6] | Dominion Energy has an $59 million unfunded commitment to be made to Align RNG by the end of 2022.

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