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Derivatives and Hedge Accounting Activities (Fair Value of Derivatives) (Detail) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Derivatives Fair Value [Line Items] |  |
Total current derivative assets | $ 545 | $ 753
Total noncurrent derivative assets | 615 | 597
Total derivative assets | 1,160 | 1,350
Total current derivative liabilities | 107 | 376
Total noncurrent derivative liabilities | 74 | 321
Total derivative liabilities | 181 | 697
Virginia Electric and Power Company |  |
Derivatives Fair Value [Line Items] |  |
Total current derivative assets | 135 | 234
Total noncurrent derivative assets | 64 | 64
Total derivative assets | 199 | 298
Total current derivative liabilities | 80 | 244
Total noncurrent derivative liabilities | 32 | 72
Total derivative liabilities | 112 | 316
Commodity Contract |  |
Derivatives Fair Value [Line Items] |  |
Total current derivative assets | 235 | 312
Total noncurrent derivative assets | 215 | 238
Total current derivative liabilities | 81 | 244
Total noncurrent derivative liabilities | 28 | 55
Commodity Contract | Virginia Electric and Power Company |  |
Derivatives Fair Value [Line Items] |  |
Total current derivative assets | 130 | 91
Total noncurrent derivative assets | 16 | 26
Total current derivative liabilities | 54 | 188
Total noncurrent derivative liabilities | 6 | 44
Interest Rate Contract |  |
Derivatives Fair Value [Line Items] |  |
Total current derivative assets | 305 | 441
Total noncurrent derivative assets | 397 | 359
Total current derivative liabilities | 0 | 121
Total noncurrent derivative liabilities | 20 | 238
Interest Rate Contract | Virginia Electric and Power Company |  |
Derivatives Fair Value [Line Items] |  |
Total current derivative assets | 0 | 143
Total noncurrent derivative assets | 45 | 38
Total current derivative liabilities | 0 | 45
Total noncurrent derivative liabilities | 0 | 0
Foreign currency exchange rate |  |
Derivatives Fair Value [Line Items] |  |
Total current derivative assets | 5 |
Total noncurrent derivative assets | 3 |
Total current derivative liabilities | 26 | 11
Total noncurrent derivative liabilities | 26 | 28
Foreign currency exchange rate | Virginia Electric and Power Company |  |
Derivatives Fair Value [Line Items] |  |
Total current derivative assets | 5 |
Total noncurrent derivative assets | 3 |
Total current derivative liabilities | 26 | 11
Total noncurrent derivative liabilities | 26 | 28
Designated as Hedging Instrument |  |
Derivatives Fair Value [Line Items] |  |
Total current derivative assets | 0 | 143
Total noncurrent derivative assets | 45 | 38
Total derivative assets | 45 | 181
Total current derivative liabilities | 0 | 45
Total noncurrent derivative liabilities | 0 | 0
Total derivative liabilities | 0 | 45
Designated as Hedging Instrument | Virginia Electric and Power Company |  |
Derivatives Fair Value [Line Items] |  |
Total current derivative assets | 0 | 143
Total noncurrent derivative assets | 45 | 38
Total derivative assets | 45 | 181
Total current derivative liabilities | 0 | 45
Total noncurrent derivative liabilities | 0 | 0
Total derivative liabilities | 0 | 45
Designated as Hedging Instrument | Commodity Contract |  |
Derivatives Fair Value [Line Items] |  |
Total current derivative assets | 0 | 0
Total noncurrent derivative assets | 0 | 0
Total current derivative liabilities | 0 | 0
Total noncurrent derivative liabilities | 0 | 0
Designated as Hedging Instrument | Commodity Contract | Virginia Electric and Power Company |  |
Derivatives Fair Value [Line Items] |  |
Total current derivative assets | 0 | 0
Total noncurrent derivative assets | 0 | 0
Total current derivative liabilities | 0 | 0
Total noncurrent derivative liabilities | 0 | 0
Designated as Hedging Instrument | Interest Rate Contract |  |
Derivatives Fair Value [Line Items] |  |
Total current derivative assets | 0 | 143
Total noncurrent derivative assets | 45 | 38
Total current derivative liabilities | 0 | 45
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 | 0 | 143
Total noncurrent derivative assets | 45 | 38
Total current derivative liabilities | 0 | 45
Total noncurrent derivative liabilities | 0 | 0
Designated as Hedging Instrument | Foreign currency exchange rate |  |
Derivatives Fair Value [Line Items] |  |
Total current derivative assets | 0 |
Total noncurrent derivative assets | 0 |
Total current derivative liabilities | 0 | 0
Total noncurrent derivative liabilities | 0 | 0
Designated as Hedging Instrument | Foreign currency exchange rate | 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 | 0
Total noncurrent derivative liabilities | 0 | 0
Fair Value - Derivatives not under Hedge Accounting |  |
Derivatives Fair Value [Line Items] |  |
Total current derivative assets | 545 | 610
Total noncurrent derivative assets | 570 | 559
Total derivative assets | 1,115 | 1,169
Total current derivative liabilities | 107 | 331
Total noncurrent derivative liabilities | 74 | 321
Total derivative liabilities | 181 | 652
Fair Value - Derivatives not under Hedge Accounting | Virginia Electric and Power Company |  |
Derivatives Fair Value [Line Items] |  |
Total current derivative assets | 135 | 91
Total noncurrent derivative assets | 19 | 26
Total derivative assets | 154 | 117
Total current derivative liabilities | 80 | 199
Total noncurrent derivative liabilities | 32 | 72
Total derivative liabilities | 112 | 271
Fair Value - Derivatives not under Hedge Accounting | Commodity Contract |  |
Derivatives Fair Value [Line Items] |  |
Total current derivative assets | 235 | 312
Total noncurrent derivative assets | 215 | 238
Total current derivative liabilities | 81 | 244
Total noncurrent derivative liabilities | 28 | 55
Fair Value - Derivatives not under Hedge Accounting | Commodity Contract | Virginia Electric and Power Company |  |
Derivatives Fair Value [Line Items] |  |
Total current derivative assets | 130 | 91
Total noncurrent derivative assets | 16 | 26
Total current derivative liabilities | 54 | 188
Total noncurrent derivative liabilities | 6 | 44
Fair Value - Derivatives not under Hedge Accounting | Interest Rate Contract |  |
Derivatives Fair Value [Line Items] |  |
Total current derivative assets | 305 | 298
Total noncurrent derivative assets | 352 | 321
Total current derivative liabilities | 0 | 76
Total noncurrent derivative liabilities | 20 | 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 | 0
Total noncurrent derivative assets | 0 | 0
Total current derivative liabilities | 0 | 0
Total noncurrent derivative liabilities | 0 | 0
Fair Value - Derivatives not under Hedge Accounting | Foreign currency exchange rate |  |
Derivatives Fair Value [Line Items] |  |
Total current derivative assets | 5 |
Total noncurrent derivative assets | 3 |
Total current derivative liabilities | 26 | 11
Total noncurrent derivative liabilities | 26 | 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 | 5 |
Total noncurrent derivative assets | 3 |
Total current derivative liabilities | 26 | 11
Total noncurrent derivative liabilities | $ 26 | $ 28

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