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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.

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