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Investments (Narrative) (Detail) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 30, 2020 USD ($) | May 31, 2022 USD ($) | Feb. 28, 2022 USD ($) | Dec. 31, 2021 USD ($) | Nov. 30, 2020 | Sep. 30, 2020 USD ($) | Oct. 31, 2017 USD ($) | Sep. 30, 2014 mi | Dec. 31, 2022 USD ($) | Aug. 31, 2022 | Mar. 31, 2022 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 | Jun. 30, 2021 USD ($) | Jul. 31, 2020 USD ($) | Mar. 31, 2020 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings from equity method investees |  |  |  |  |  |  |  |  |  |  |  |  | $ 299,000,000 | $ 276,000,000 | $ 40,000,000 |  |  |  |
Net income (loss) from discontinued operations including noncontrolling interest | [1],[2] |  |  |  |  |  |  |  |  |  |  |  | 9,000,000 | 641,000,000 | (1,878,000,000) |  |  |  |
Distributions received from investment |  |  |  |  |  |  |  |  |  |  |  |  | 355,000,000 | 328,000,000 | 102,000,000 |  |  |  |
Equity method investment goodwill |  |  |  |  | $ 27,000,000 |  |  |  |  | $ 9,000,000 |  |  | 9,000,000 | 27,000,000 |  |  |  |  |
Income loss from continuing operations before income taxes extraordinary items noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  | 1,053,000,000 | 3,098,000,000 | 1,411,000,000 |  |  |  |
Contributions to equity method affiliates |  |  |  |  |  |  |  |  |  |  |  |  | 43,000,000 | 1,021,000,000 | 148,000,000 |  |  |  |
Debt maximum borrowing capacity | [3] |  |  |  | 6,000,000,000 |  |  |  |  | 6,000,000,000 |  |  | 6,000,000,000 | 6,000,000,000 |  |  |  |  |
Retained earnings |  |  |  |  | 5,373,000,000 |  |  |  |  | 4,065,000,000 |  |  | 4,065,000,000 | 5,373,000,000 |  |  |  |  |
Operating revenue from contracts with customers |  |  |  |  |  |  |  |  |  |  |  |  | 17,725,000,000 | 14,170,000,000 | 13,752,000,000 |  |  |  |
Goodwill write-off | [4] |  |  |  |  |  |  |  |  |  |  |  | 110,000,000 |  |  |  |  |  |
Income tax expense |  | $ 336,000,000 |  |  | 173,000,000 |  |  |  |  |  |  |  | 68,000,000 | 425,000,000 | 83,000,000 |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,000,000,000.0 |  |
Pivotal LNG |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%
Finite Lived Equity Method Investment Basis Difference |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount of investment that exceeded share of underlying equity |  |  |  |  | 244,000,000 |  |  |  |  | 223,000,000 |  |  | 223,000,000 | 244,000,000 |  |  |  |  |
Unfunded commitments |  |  |  |  | $ (4,000,000) |  |  |  |  |  |  |  |  | (4,000,000) |  |  |  |  |
Capitalized interest |  |  |  |  |  |  |  |  |  |  |  |  | (1,000,000) |  |  |  |  |  |
Cove Point |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest percentage of limited partner interests |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Income loss from continuing operations before income taxes extraordinary items noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  | $ 574,000,000 | $ 528,000,000 | 511,000,000 |  |  |  |
JAX LNG LLC | Pivotal LNG |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity interest sold to noncontrolling interest owners |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00%
Fowler Ridge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net payment of long-term power and capacity contract |  |  |  |  |  |  | $ 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Contract termination loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 221,000,000 |  |  |  |
Contract termination loss net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 165,000,000 |  |  |  |
Fowler Ridge | BP Wind Energy North America Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity interest sold to noncontrolling interest owners |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |
Wrangler Retail Gas Holdings LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest percentage of limited partner interests |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% | 20.00% | 20.00% |  |  |
Percentage ownership in total units |  |  |  |  | 15.00% |  |  |  |  |  |  | 15.00% |  | 15.00% |  |  |  |  |
Limited partnership interest sale transaction, proceeds received |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 127,000,000 | $ 74,000,000 |  |  |  |
Initial fair value |  |  |  |  | $ 23,000,000 |  |  |  |  |  |  |  |  | 23,000,000 | 13,000,000 |  |  |  |
Amount of gain from sale |  |  |  |  |  |  |  |  |  |  |  |  |  | 87,000,000 | 64,000,000 |  |  |  |
Goodwill write-off |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,000,000 |  |  |  |  |
Income tax expense |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 32,000,000 | 19,000,000 |  |  |  |
Wrangler Retail Gas Holdings LLC | Gas Supply, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest percentage of limited partner interests |  |  |  |  |  |  |  |  |  |  |  |  | 15.00% | 5.00% |  |  |  |  |
Cash consideration from sale of noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  | $ 85,000,000 |  |  |  |  |  |
Amount of gain from sale |  |  |  |  |  |  |  |  |  |  |  |  | 11,000,000 | $ 10,000,000 |  |  |  |  |
Amount of gain from sale, after tax |  |  |  |  |  |  |  |  |  |  |  |  | 8,000,000 |  |  |  |  |  |
Income tax expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 |  |  |  |  |
Sale of interest in Cove Point |  |  |  |  |  |  |  |  |  |  |  |  |  | 33,000,000 |  |  |  |  |
Dominion Energy Virginia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration from sale of noncontrolling interest |  |  |  | $ 120,000,000 |  |  |  |  |  |  |  |  | 215,000,000 |  |  |  |  |  |
Limited partnership interest sale transaction, proceeds received |  |  |  | $ 60,000,000 |  |  |  |  |  | $ 108,000,000 |  |  | $ 108,000,000 |  |  |  |  |  |
Percentage ownership in total units |  |  |  | 50.00% |  |  |  |  |  | 50.00% |  |  | 50.00% |  |  |  |  |  |
Initial fair value |  |  |  | $ 60,000,000 |  |  |  |  |  | $ 107,000,000 |  |  | $ 107,000,000 |  |  |  |  |  |
Amount of gain from sale |  |  |  |  |  |  |  |  |  | 133,000,000 |  | $ 23,000,000 |  |  |  |  |  |  |
Amount of gain from sale, after tax |  |  |  |  |  |  |  |  |  | $ 99,000,000 |  | $ 16,000,000 |  |  |  |  |  |  |
Agreement entered date |  |  |  | 2022-02 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cove Point |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions received from investment |  |  |  |  |  |  |  |  |  |  |  |  | $ 344,000,000 | 300,000,000 | 70,000,000 |  |  |  |
Percentage of noncontrolling limited partnership interest retained |  |  |  |  |  |  |  |  |  | 50.00% |  |  | 50.00% |  |  |  |  |  |
Contributions to equity method affiliates |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | 0 | 0 |  |  |  |
Cove Point | Finite Lived Equity Method Investment Basis Difference |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment goodwill |  |  |  |  | 221,000,000 |  |  |  |  | $ 215,000,000 |  |  | 215,000,000 | 221,000,000 |  |  |  |  |
Cove Point | Cove Point |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings from equity method investees |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,000,000 |  |  |  |
Cove Point | Cove Point | GT&S Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of limited partner interest sold |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of noncontrolling limited partnership interest retained |  | 50.00% |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Atlantic Coast Pipeline |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings from equity method investees |  |  |  |  |  |  |  |  |  |  |  |  | 7,000,000 | 20,000,000 | 2,300,000,000 |  |  |  |
Net income (loss) from discontinued operations including noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  | $ (7,000,000) | (20,000,000) | (2,300,000,000) |  |  |  |
Percentage of noncontrolling limited partnership interest retained |  |  |  |  |  |  |  |  |  | 53.00% |  |  | 53.00% |  |  |  |  |  |
Contributions to equity method affiliates |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000 | 965,000,000 | 107,000,000 |  |  |  |
Cost to acquire equity method investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 184,000,000
Equity in earnings (losses) on investments after tax |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 | 14,000,000 | 1,800,000,000 |  |  |  |
Atlantic Coast Pipeline | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt maximum borrowing capacity |  |  |  |  |  |  |  | $ 3,400,000,000 |  |  |  |  |  |  |  |  |  | $ 1,900,000,000 |
Credit facility, maturity date |  |  |  |  |  |  |  | Oct. 31, 2021 |  |  |  |  |  |  |  |  |  |  |
Atlantic Coast Pipeline | Revolving Credit Facility | Financial Guarantee | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48,000,000 |  |  |  |
Atlantic Coast Pipeline | Other Current Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current liabilities |  |  |  |  | 113,000,000 |  |  |  |  | $ 114,000,000 |  |  | 114,000,000 | 113,000,000 |  |  |  |  |
Atlantic Coast Pipeline | DETI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue from contracts with customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 49,000,000 |  |  |  |
Atlantic Coast Pipeline | Pipelines | Jointly Owned Natural Gas Pipeline | Distribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Length of natural gas pipeline (in miles) | mi |  |  |  |  |  |  |  |  | 600 |  |  |  |  |  |  |  |  |  |
Duration of contract |  |  |  |  |  |  |  |  | 20 years |  |  |  |  |  |  |  |  |  |
Atlantic Coast Pipeline | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00%
Percentage ownership in total units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 53.00%
Trading Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rabbi trust securities |  |  |  |  | $ 122,000,000 |  |  |  |  | $ 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  | 1.75% |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Includes income tax expense (benefit) of $8 million, $188 million and $(204) million for the years ended December 31, 2022, 2021 and 2020, respectively.
[2] | See Note 9 for amounts attributable to related parties.
[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.
[4] | See Note 3 for more information.

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