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Significant Accounting Policies (Reconciliation of Total Cash, Restricted Cash and Equivalents) (Parenthetical) (Detail) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Cash Cash Equivalents And Restricted Cash [Line Items] |  |  |  |  |  |
Cash and cash equivalents | [1] | $ 932 | $ 310 | [2] |  |
Restricted cash and equivalents |  |  |  |  |  | $ 4
Restricted Cash and Cash Equivalent, Current, Statement of Financial Position [Extensible Enumeration] |  |  |  |  |  | Other Assets, Current
VIE |  |  |  |  |  |
Cash Cash Equivalents And Restricted Cash [Line Items] |  |  |  |  |  |
Restricted cash and equivalents |  | $ 115 | $ 41 |  | $ 100 |
Assets Held For Sale |  |  |  |  |  |
Cash Cash Equivalents And Restricted Cash [Line Items] |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  | $ 33
[1] | See Note 15 for amounts attributable to VIEs.
[2] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2024 has been derived from the audited Consolidated Balance Sheet at that date.

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