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Derivatives and Hedge Accounting Activities (Fair Value of Derivatives) (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Derivatives Fair Value [Line Items]    
Total current derivative assets $ 286 $ 436
Total noncurrent derivative assets 464 963
Total derivative assets 750 1,399
Total current derivative liabilities 69 207
Total noncurrent derivative liabilities 198 305
Total derivative liabilities 267 512
Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Total current derivative assets 192 248
Total noncurrent derivative assets 112 127
Total derivative assets 304 375
Total current derivative liabilities 28 139
Total noncurrent derivative liabilities 62 86
Total derivative liabilities 90 225
Designated as Hedging Instrument | Interest Rate Contract    
Derivatives Fair Value [Line Items]    
Total current derivative assets 25 137
Total noncurrent derivative assets 52 93
Total current derivative liabilities 2 0
Total noncurrent derivative liabilities 71 0
Designated as Hedging Instrument | Interest Rate Contract | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Total current derivative assets 25 137
Total noncurrent derivative assets 52 93
Total current derivative liabilities 2 0
Total noncurrent derivative liabilities 53 0
Fair Value - Derivatives not under Hedge Accounting | Commodity Contract    
Derivatives Fair Value [Line Items]    
Total current derivative assets 224 171
Total noncurrent derivative assets 304 323
Total current derivative liabilities 62 78
Total noncurrent derivative liabilities 81 45
Fair Value - Derivatives not under Hedge Accounting | Commodity Contract | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Total current derivative assets 144 84
Total noncurrent derivative assets 51 31
Total current derivative liabilities 23 32
Total noncurrent derivative liabilities 2 1
Fair Value - Derivatives not under Hedge Accounting | Interest Rate Contract    
Derivatives Fair Value [Line Items]    
Total current derivative assets 14 101
Total noncurrent derivative assets 99 544
Total current derivative liabilities 2 22
Total noncurrent derivative liabilities 39 175
Fair Value - Derivatives not under Hedge Accounting | Foreign currency exchange rate    
Derivatives Fair Value [Line Items]    
Total current derivative assets 23 27
Total noncurrent derivative assets 9 3
Total current derivative liabilities 3 107
Total noncurrent derivative liabilities 7 85
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 23 27
Total noncurrent derivative assets 9 3
Total current derivative liabilities 3 107
Total noncurrent derivative liabilities $ 7 $ 85