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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 | [1] | $ 122
Derivative asset, noncurrent | [3] | 1,039 | [2] | 491
Total derivative assets |  | 2,176 |  | 613
Derivative liabilities | [4] | 778 |  | 359
Derivative Liability, Noncurrent | [5],[6] | 626 |  | 509
Total derivative liabilities |  | 1,404 |  | 868
Virginia Electric and Power Company |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Current | [7] | 765 | [1] | 76
Derivative Asset, Noncurrent | [3] | 117 | [2] | 224
Total derivative assets |  | 882 |  | 300
Derivative liabilities | [4],[8] | 298 |  | 134
Derivative Liability, Noncurrent | [5],[6] | 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] | 1
Derivative asset, noncurrent | [3] | 113 | [2] | 145
Total derivative assets |  | 614 |  | 146
Derivative liabilities | [4] | 0 |  | 42
Derivative Liability, Noncurrent | [5],[6] | 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] | 1
Derivative Asset, Noncurrent | [3] | 113 | [2] | 145
Total derivative assets |  | 614 |  | 146
Derivative liabilities | [4] | 0 |  | 42
Derivative Liability, Noncurrent | [5],[6] | 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 | [1] | 121
Derivative asset, noncurrent | [3] | 926 | [2] | 346
Total derivative assets |  | 1,562 |  | 467
Derivative liabilities | [4] | 778 |  | 317
Derivative Liability, Noncurrent | [5],[6] | 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 | [1] | 75
Derivative Asset, Noncurrent | [3] | 4 | [2] | 79
Total derivative assets |  | 268 |  | 154
Derivative liabilities | [4] | 298 |  | 92
Derivative Liability, Noncurrent | [5],[6] | 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] | Includes $118 million and $6 million reported in current assets held for sale in Dominion Energy's Consolidated Balance Sheets at December 31, 2022 and 2021, respectively.
[2] | Includes $1 million reported in noncurrent assets held for sale in Dominion Energy's Consolidated Balance Sheets at December 31, 2022.
[3] | Virginia Power’s noncurrent derivative assets are presented in other deferred charges and other assets in its Consolidated Balance Sheets.
[4] | Includes $6 million and $3 million reported in current liabilities held for sale in Dominion Energy's Consolidated Balance Sheets at December 31, 2022 and 2021, respectively.
[5] | Includes $1 million reported in noncurrent liabilities held for sale in Dominion Energy's Consolidated Balance Sheets at both December 31, 2022 and 2021.
[6] | Virginia Power’s noncurrent derivative liabilities are presented in other deferred credits and other liabilities in its Consolidated Balance Sheets.
[7] | See Note 25 for amounts attributable to affiliates.
[8] | See Note 25 for amounts attributable to affiliates.

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