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Derivatives and Hedge Accounting Activities (Fair Value of Derivatives) (Detail) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Derivatives Fair Value [Line Items] |  |  |
Total current derivative assets | [1] | $ 251 | $ 436
Total noncurrent derivative assets | [2] | 813 | 963
Total derivative assets |  | 1,064 | 1,399
Total current derivative liabilities | [1] | 207 | 207
Total noncurrent derivative liabilities | [2] | 268 | 305
Total derivative liabilities |  | 475 | 512
Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Total current derivative assets | [1] | 54 | 248
Total noncurrent derivative assets | [2] | 58 | 127
Total derivative assets |  | 112 | 375
Total current derivative liabilities | [1] | 122 | 139
Total noncurrent derivative liabilities | [2] | 61 | 86
Total derivative liabilities |  | 183 | 225
Designated as Hedging Instrument | Interest Rate Contract |  |  |
Derivatives Fair Value [Line Items] |  |  |
Total current derivative assets |  | 5 | 137
Total noncurrent derivative assets |  | 35 | 93
Total current derivative liabilities |  | 0 | 0
Total noncurrent derivative liabilities |  | 30 | 0
Designated as Hedging Instrument | Interest Rate Contract | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Total current derivative assets |  | 5 | 137
Total noncurrent derivative assets |  | 35 | 93
Total current derivative liabilities |  | 0 | 0
Total noncurrent derivative liabilities |  | 17 | 0
Fair Value - Derivatives not under Hedge Accounting | Commodity Contract |  |  |
Derivatives Fair Value [Line Items] |  |  |
Total current derivative assets |  | 145 | 171
Total noncurrent derivative assets |  | 256 | 323
Total current derivative liabilities |  | 117 | 78
Total noncurrent derivative liabilities |  | 33 | 45
Fair Value - Derivatives not under Hedge Accounting | Commodity Contract | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Total current derivative assets |  | 40 | 84
Total noncurrent derivative assets |  | 23 | 31
Total current derivative liabilities |  | 44 | 32
Total noncurrent derivative liabilities |  | 1 | 1
Fair Value - Derivatives not under Hedge Accounting | Interest Rate Contract |  |  |
Derivatives Fair Value [Line Items] |  |  |
Total current derivative assets |  | 92 | 101
Total noncurrent derivative assets |  | 522 | 544
Total current derivative liabilities |  | 12 | 22
Total noncurrent derivative liabilities |  | 162 | 175
Fair Value - Derivatives not under Hedge Accounting | Foreign currency exchange rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Total current derivative assets |  | 9 | 27
Total noncurrent derivative assets |  | 0 | 3
Total current derivative liabilities |  | 78 | 107
Total noncurrent derivative liabilities |  | 43 | 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 |  | 9 | 27
Total noncurrent derivative assets |  | 0 | 3
Total current derivative liabilities |  | 78 | 107
Total noncurrent derivative liabilities |  | $ 43 | $ 85
[1] | Current derivative liabilities are presented in other current liabilities in the Companies’ 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 the Companies’ Consolidated Balance Sheets.

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