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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Assets) (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Offsetting Assets [Line Items]    
Gross Assets Presented in the Consolidated Balance Sheet [1] $ 534 $ 1,157
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 93 301
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 441 856
Virginia Electric and Power Company    
Offsetting Assets [Line Items]    
Gross Assets Presented in the Consolidated Balance Sheet [1] 284 357
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 24 45
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 260 312
Commodity Contract | Over-the-counter    
Offsetting Assets [Line Items]    
Gross Assets Presented in the Consolidated Balance Sheet [1] 249 197
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 9 20
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 240 177
Commodity Contract | Over-the-counter | Virginia Electric and Power Company    
Offsetting Assets [Line Items]    
Gross Assets Presented in the Consolidated Balance Sheet [1] 175 95
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 7 14
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 168 81
Commodity Contract | Exchange    
Offsetting Assets [Line Items]    
Gross Assets Presented in the Consolidated Balance Sheet [1] 63 55
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 63 54
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 0 1
Commodity Contract | Exchange | Virginia Electric and Power Company    
Offsetting Assets [Line Items]    
Gross Assets Presented in the Consolidated Balance Sheet [1] 0 2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 0 1
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 0 1
Interest Rate Contract | Over-the-counter    
Offsetting Assets [Line Items]    
Gross Assets Presented in the Consolidated Balance Sheet [1] 190 875
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 14 197
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 176 678
Interest Rate Contract | Over-the-counter | Virginia Electric and Power Company    
Offsetting Assets [Line Items]    
Gross Assets Presented in the Consolidated Balance Sheet [1] 77 230
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 10 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 67 230
Foreign Currency Exchange Rate Contract | Over-the-counter    
Offsetting Assets [Line Items]    
Gross Assets Presented in the Consolidated Balance Sheet [1] 32 30
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 7 30
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 25 0
Foreign Currency Exchange Rate Contract | Over-the-counter | Virginia Electric and Power Company    
Offsetting Assets [Line Items]    
Gross Assets Presented in the Consolidated Balance Sheet [1] 32 30
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 7 30
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts $ 25 $ 0
[1] Excludes derivative assets of $216 million and $242 million at September 30, 2025 and December 31, 2024, respectively, at Dominion Energy and $20 million and $18 million at September 30, 2025 and December 31, 2024, respectively, at Virginia Power, which are not subject to master netting or other similar arrangements.