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Derivatives and Hedge Accounting Activities (Fair Value of Derivatives) (Detail) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | $ 1,137 | $ 122
Derivative Asset, Noncurrent | [1] | 1,039 | 491
Total derivative assets |  | 2,176 | 613
Derivative liabilities |  | 778 | 359
Derivative Liability, Noncurrent | [2] | 626 | 509
Total derivative liabilities |  | 1,404 | 868
Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current | [3] | 765 | 76
Derivative Asset, Noncurrent | [1] | 117 | 224
Total derivative assets |  | 882 | 300
Derivative liabilities | [4] | 298 | 134
Derivative Liability, Noncurrent | [2] | 158 | 336
Total derivative liabilities |  | 456 | 470
Commodity Contract |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 532 | 103
Derivative Asset, Noncurrent |  | 237 | 179
Derivative liabilities |  | 700 | 304
Derivative Liability, Noncurrent |  | 226 | 165
Commodity Contract | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 264 | 74
Derivative Asset, Noncurrent |  | 4 | 72
Derivative liabilities |  | 290 | 92
Derivative Liability, Noncurrent |  | 58 | 41
Interest Rate Contract |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 605 | 18
Derivative Asset, Noncurrent |  | 802 | 305
Derivative liabilities |  | 70 | 55
Derivative Liability, Noncurrent |  | 307 | 344
Interest Rate Contract | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 501 | 1
Derivative Asset, Noncurrent |  | 113 | 145
Derivative liabilities |  | 0 | 42
Derivative Liability, Noncurrent |  | 7 | 295
Foreign currency exchange rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  |  | 1
Derivative Asset, Noncurrent |  |  | 7
Derivative liabilities |  | 8 |
Derivative Liability, Noncurrent |  | 93 |
Foreign currency exchange rate | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  |  | 1
Derivative Asset, Noncurrent |  |  | 7
Derivative liabilities |  | 8 |
Derivative Liability, Noncurrent |  | 93 |
Designated as Hedging Instrument |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 501 | 1
Derivative Asset, Noncurrent | [1] | 113 | 145
Total derivative assets |  | 614 | 146
Derivative liabilities |  | 0 | 42
Derivative Liability, Noncurrent | [2] | 7 | 295
Total derivative liabilities |  | 7 | 337
Designated as Hedging Instrument | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 501 | 1
Derivative Asset, Noncurrent | [1] | 113 | 145
Total derivative assets |  | 614 | 146
Derivative liabilities |  | 0 | 42
Derivative Liability, Noncurrent | [2] | 7 | 295
Total derivative liabilities |  | 7 | 337
Designated as Hedging Instrument | Commodity Contract |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 0 | 0
Derivative Asset, Noncurrent |  | 0 | 0
Derivative liabilities |  | 0 | 0
Derivative Liability, Noncurrent |  | 0 | 0
Designated as Hedging Instrument | Commodity Contract | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 0 | 0
Derivative Asset, Noncurrent |  | 0 | 0
Derivative liabilities |  | 0 | 0
Derivative Liability, Noncurrent |  | 0 | 0
Designated as Hedging Instrument | Interest Rate Contract |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 501 | 1
Derivative Asset, Noncurrent |  | 113 | 145
Derivative liabilities |  | 0 | 42
Derivative Liability, Noncurrent |  | 7 | 295
Designated as Hedging Instrument | Interest Rate Contract | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 501 | 1
Derivative Asset, Noncurrent |  | 113 | 145
Derivative liabilities |  | 0 | 42
Derivative Liability, Noncurrent |  | 7 | 295
Designated as Hedging Instrument | Foreign currency exchange rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  |  | 0
Derivative Asset, Noncurrent |  |  | 0
Derivative liabilities |  | 0 |
Derivative Liability, Noncurrent |  | 0 |
Designated as Hedging Instrument | Foreign currency exchange rate | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  |  | 0
Derivative Asset, Noncurrent |  |  | 0
Derivative liabilities |  | 0 |
Derivative Liability, Noncurrent |  | 0 |
Fair Value - Derivatives not under Hedge Accounting |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 636 | 121
Derivative Asset, Noncurrent | [1] | 926 | 346
Total derivative assets |  | 1,562 | 467
Derivative liabilities |  | 778 | 317
Derivative Liability, Noncurrent | [2] | 619 | 214
Total derivative liabilities |  | 1,397 | 531
Fair Value - Derivatives not under Hedge Accounting | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 264 | 75
Derivative Asset, Noncurrent | [1] | 4 | 79
Total derivative assets |  | 268 | 154
Derivative liabilities |  | 298 | 92
Derivative Liability, Noncurrent | [2] | 151 | 41
Total derivative liabilities |  | 449 | 133
Fair Value - Derivatives not under Hedge Accounting | Commodity Contract |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 532 | 103
Derivative Asset, Noncurrent |  | 237 | 179
Derivative liabilities |  | 700 | 304
Derivative Liability, Noncurrent |  | 226 | 165
Fair Value - Derivatives not under Hedge Accounting | Commodity Contract | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 264 | 74
Derivative Asset, Noncurrent |  | 4 | 72
Derivative liabilities |  | 290 | 92
Derivative Liability, Noncurrent |  | 58 | 41
Fair Value - Derivatives not under Hedge Accounting | Interest Rate Contract |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 104 | 17
Derivative Asset, Noncurrent |  | 689 | 160
Derivative liabilities |  | 70 | 13
Derivative Liability, Noncurrent |  | 300 | 49
Fair Value - Derivatives not under Hedge Accounting | Interest Rate Contract | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 0 | 0
Derivative Asset, Noncurrent |  | 0 | 0
Derivative liabilities |  | 0 | 0
Derivative Liability, Noncurrent |  | 0 | 0
Fair Value - Derivatives not under Hedge Accounting | Foreign currency exchange rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  |  | 1
Derivative Asset, Noncurrent |  |  | 7
Derivative liabilities |  | 8 |
Derivative Liability, Noncurrent |  | 93 |
Fair Value - Derivatives not under Hedge Accounting | Foreign currency exchange rate | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  |  | 1
Derivative Asset, Noncurrent |  |  | $ 7
Derivative liabilities |  | 8 |
Derivative Liability, Noncurrent |  | $ 93 |
[1] | Virginia Power’s noncurrent derivative assets are presented in other deferred charges and other assets in its Consolidated Balance Sheets.
[2] | Virginia Power’s noncurrent derivative liabilities are presented in other deferred credits and other liabilities in its Consolidated Balance Sheets.
[3] | See Note 25 for amounts attributable to affiliates.
[4] | See Note 25 for amounts attributable to affiliates.

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