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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.