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Significant Accounting Policies (Reconciliation of Total Cash, Restricted Cash and Equivalents) (Parenthetical) (Detail) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Cash Cash Equivalents And Restricted Cash [Line Items] |  |  |  |  |
Cash and cash equivalents | $ 1,776 | $ 184 | [1] |  |
Restricted cash and equivalents |  | $ 4 |  | $ 4 | $ 2
Restricted Cash and Cash Equivalents, Current, Statement of Financial Position [Extensible Enumeration] | Current assets held for sale | Current assets held for sale |  | Current assets held for sale | Current assets held for sale
VIE |  |  |  |  |
Cash Cash Equivalents And Restricted Cash [Line Items] |  |  |  |  |
Restricted cash and equivalents | $ 100 |  |  |  |
Current Assets Held for Sale |  |  |  |  |
Cash Cash Equivalents And Restricted Cash [Line Items] |  |  |  |  |
Cash and cash equivalents |  | $ 33 |  | $ 39 | $ 34
[1] | 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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