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Significant Accounting Policies (Reconciliation of Total Cash, Restricted Cash and Equivalents) (Parenthetical) (Detail) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Cash Cash Equivalents And Restricted Cash [Line Items]        
Cash and cash equivalents $ 137 $ 153 [1]    
Current Assets Held for Sale        
Cash Cash Equivalents And Restricted Cash [Line Items]        
Cash and cash equivalents $ 0 $ 0 $ 1 $ 0
[1] Dominion Energy’s Consolidated Balance Sheet at December 31, 2022 has been derived from the audited Consolidated Balance Sheet at that date.