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Investments (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Feb. 29, 2024
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Earnings from equity method investees |  |  | $ 2 |  |  |
Net earnings (losses) from discontinued operations including noncontrolling interest | [1] | $ (114) | (281) |  |  |
Distributions received from investment |  | 131 | 85 |  |  |
Equity method affiliates includes cash and accrued amounts of contributions |  | 3 | 10 |  |  |
Current liabilities |  | 4,386 |  | $ 8,885 | [2] |
Contributions to equity method affiliates |  | 7 | 10 |  |  |
Income tax expense (benefit) from discontinued operations |  | 51 | 56 |  |  |
Investment company received distribution amount |  |  |  |  |  | $ 126
Discontinued operations |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Net earnings (losses) from discontinued operations including noncontrolling interest |  | (10) | 76 |  |  |
Atlantic Coast Pipeline |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Earnings from equity method investees |  | (11) | (1) |  |  |
Atlantic Coast Pipeline | Other Current Liabilities |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Current liabilities |  | 14 |  | 4 |  |
Cove Point |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Distributions received from investment |  |  | 83 |  |  |
Discontinued operations, interest expense |  |  | 62 |  |  |
Income tax expense (benefit) from discontinued operations |  |  | 3 |  |  |
Cove Point | Discontinued operations |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Earnings from equity method investees |  |  | $ 76 |  |  |
Finite Lived Equity Method Investment Basis Difference |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Carrying amount of investment that exceeded share of underlying equity |  | 13 |  | 18 |  |
Equity method investment goodwill |  | 9 |  | 9 |  |
Capitalized interest |  | (2) |  | (3) |  |
Trading Securities |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Rabbi trust securities |  | 141 |  | $ 119 |  |
Maximum |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Earnings from equity method investees |  | $ 1 |  |  |  |
[1] | Includes income tax expense of $51 million and $56 million for the three months ended March 31, 2024 and 2023, respectively.
[2] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2023 has been derived from the audited Consolidated Balance Sheet at that date.

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