v3.25.2
Derivatives and Hedge Accounting Activities (Schedule of Offsetting Assets) (Detail) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Offsetting Assets [Line Items]    
Gross Assets Presented in the Consolidated Balance Sheet [1] $ 579 $ 1,157
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 91 301
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 488 856
Virginia Electric and Power Company    
Offsetting Assets [Line Items]    
Gross Assets Presented in the Consolidated Balance Sheet [1] 303 357
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 18 45
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 285 312
Commodity Contract | Over-the-counter    
Offsetting Assets [Line Items]    
Gross Assets Presented in the Consolidated Balance Sheet [1] 285 197
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 11 20
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 274 177
Commodity Contract | Over-the-counter | Virginia Electric and Power Company    
Offsetting Assets [Line Items]    
Gross Assets Presented in the Consolidated Balance Sheet [1] 187 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 180 81
Commodity Contract | Exchange    
Offsetting Assets [Line Items]    
Gross Assets Presented in the Consolidated Balance Sheet [1] 67 55
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 67 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] 1 2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 1 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] 183 875
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 6 197
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 177 678
Interest Rate Contract | Over-the-counter | Virginia Electric and Power Company    
Offsetting Assets [Line Items]    
Gross Assets Presented in the Consolidated Balance Sheet [1] 71 230
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 3 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 68 230
Foreign Currency Exchange Rate Contract | Over-the-counter    
Offsetting Assets [Line Items]    
Gross Assets Presented in the Consolidated Balance Sheet [1] 44 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 37 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] 44 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 $ 37 $ 0
[1] Excludes derivative assets of $167 million and $242 million at June 30, 2025 and December 31, 2024, respectively, at Dominion Energy and $18 million at both June 30, 2025 and December 31, 2024 at Virginia Power, which are not subject to master netting or other similar arrangements.