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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Liabilities) (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Offsetting Liabilities [Line Items]    
Gross Liabilities Presented in the Consolidated Balance Sheet [1] $ 263 $ 505
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 93 301
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral 52 20
Net Amounts 118 184
Virginia Electric and Power Company    
Offsetting Liabilities [Line Items]    
Gross Liabilities Presented in the Consolidated Balance Sheet [1] 80 208
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 24 45
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral 1 0
Net Amounts 55 163
Commodity Contract | Over-the-counter    
Offsetting Liabilities [Line Items]    
Gross Liabilities Presented in the Consolidated Balance Sheet [1] 24 42
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 9 20
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral 0 0
Net Amounts 15 22
Commodity Contract | Over-the-counter | Virginia Electric and Power Company    
Offsetting Liabilities [Line Items]    
Gross Liabilities Presented in the Consolidated Balance Sheet [1] 14 15
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 7 14
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral 0 0
Net Amounts 7 1
Commodity Contract | Exchange    
Offsetting Liabilities [Line Items]    
Gross Liabilities Presented in the Consolidated Balance Sheet [1] 115 74
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 63 54
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral 52 20
Net Amounts 0 0
Commodity Contract | Exchange | Virginia Electric and Power Company    
Offsetting Liabilities [Line Items]    
Gross Liabilities Presented in the Consolidated Balance Sheet [1] 1 1
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 0 1
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral 1 0
Net Amounts 0 0
Interest Rate Contract | Over-the-counter    
Offsetting Liabilities [Line Items]    
Gross Liabilities Presented in the Consolidated Balance Sheet [1] 114 197
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 14 197
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral 0 0
Net Amounts 100 0
Interest Rate Contract | Over-the-counter | Virginia Electric and Power Company    
Offsetting Liabilities [Line Items]    
Gross Liabilities Presented in the Consolidated Balance Sheet [1] 55 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 10 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral 0 0
Net Amounts 45 0
Foreign Currency Exchange Rate Contract | Over-the-counter    
Offsetting Liabilities [Line Items]    
Gross Liabilities Presented in the Consolidated Balance Sheet [1] 10 192
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 7 30
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral 0 0
Net Amounts 3 162
Foreign Currency Exchange Rate Contract | Over-the-counter | Virginia Electric and Power Company    
Offsetting Liabilities [Line Items]    
Gross Liabilities Presented in the Consolidated Balance Sheet [1] 10 192
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 7 30
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral 0 0
Net Amounts $ 3 $ 162
[1] Excludes derivative liabilities of $4 million and $7 million at Dominion Energy and $10 million and $17 million at Virginia Power at September 30, 2025 and December 31, 2024, respectively, which are not subject to master netting or similar arrangements.