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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

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