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Derivatives and Hedge Accounting Activities (Fair Value of Derivatives) (Detail) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Derivatives Fair Value [Line Items]    
Total current derivative assets $ 436 $ 753 [1]
Total noncurrent derivative assets [2] 963 597
Total derivative assets 1,399 1,350
Total current derivative liabilities 207 376 [1]
Total noncurrent derivative liabilities [2] 305 321
Total derivative liabilities 512 697
Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Total current derivative assets 248 234 [1]
Total noncurrent derivative assets [2] 127 64
Total derivative assets 375 298
Total current derivative liabilities 139 244 [1]
Total noncurrent derivative liabilities [2] 86 72
Total derivative liabilities 225 316
Designated as Hedging Instrument | Interest Rate Contract    
Derivatives Fair Value [Line Items]    
Total current derivative assets 137 143 [1]
Total noncurrent derivative assets 93 38
Total current derivative liabilities 0 45 [1]
Total noncurrent derivative liabilities 0 0
Designated as Hedging Instrument | Interest Rate Contract | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Total current derivative assets 137 143 [1]
Total noncurrent derivative assets 93 38
Total current derivative liabilities 0 45 [1]
Total noncurrent derivative liabilities 0 0
Fair Value - Derivatives not under Hedge Accounting | Commodity Contract    
Derivatives Fair Value [Line Items]    
Total current derivative assets 171 312
Total noncurrent derivative assets 323 238
Total current derivative liabilities 78 244
Total noncurrent derivative liabilities 45 55
Fair Value - Derivatives not under Hedge Accounting | Commodity Contract | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Total current derivative assets 84 91
Total noncurrent derivative assets 31 26
Total current derivative liabilities 32 188
Total noncurrent derivative liabilities 1 44
Fair Value - Derivatives not under Hedge Accounting | Interest Rate Contract    
Derivatives Fair Value [Line Items]    
Total current derivative assets 101 298
Total noncurrent derivative assets 544 321
Total current derivative liabilities 22 76
Total noncurrent derivative liabilities 175 238
Fair Value - Derivatives not under Hedge Accounting | Interest Rate Contract | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Total current derivative assets   0
Total noncurrent derivative assets   0
Total current derivative liabilities   0
Total noncurrent derivative liabilities   0
Fair Value - Derivatives not under Hedge Accounting | Foreign currency exchange rate    
Derivatives Fair Value [Line Items]    
Total current derivative assets 27 0
Total noncurrent derivative assets 3 0
Total current derivative liabilities 107 11
Total noncurrent derivative liabilities 85 28
Fair Value - Derivatives not under Hedge Accounting | Foreign currency exchange rate | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Total current derivative assets 27 0
Total noncurrent derivative assets 3 0
Total current derivative liabilities 107 11
Total noncurrent derivative liabilities $ 85 $ 28
[1] Includes $54 million recorded in assets held for sale and $30 million recorded in liabilities held for sale in Dominion Energy's Consolidated Balance Sheets.
[2] Noncurrent derivative assets are presented in other deferred charges and other assets and noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Virginia Power’s Consolidated Balance Sheets.