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Derivatives and Hedge Accounting Activities (Fair Value of Derivatives) (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current | [1] | $ 67 | $ 68
Derivative Asset, Noncurrent | [2] | 330 | 25
Derivative Asset |  | 397 | 93
Derivative Liabilities, Current | [3] | 415 | 408
Derivative Liabilities, Noncurrent | [4] | 71 | 332
Derivative Liabilities |  | 486 | 740
Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current | [5] | 22 | 20
Derivative Asset, Noncurrent | [6] | 159 | 4
Derivative Asset |  | 181 | 24
Derivative liabilities | [7] | 390 | 243
Derivative Liability, Noncurrent | [8] | 15 | 223
Derivative Liabilities |  | 405 | 466
Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 58 | 67
Derivative Asset, Noncurrent |  | 109 | 7
Derivative Liabilities, Current |  | 42 | 83
Derivative Liabilities, Noncurrent |  | 13 | 48
Commodity | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 22 | 20
Derivative Asset, Noncurrent |  | 93 | 2
Derivative liabilities |  | 28 | 58
Derivative Liability, Noncurrent |  | 1 | 45
Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 9 | 1
Derivative Asset, Noncurrent |  | 221 | 10
Derivative Liabilities, Current |  | 373 | 322
Derivative Liabilities, Noncurrent |  | 58 | 284
Interest rate | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  |  | 0
Derivative Asset, Noncurrent |  | 66 | 2
Derivative liabilities |  | 362 | 185
Derivative Liability, Noncurrent |  | 14 | 178
Foreign currency |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Noncurrent |  |  | 8
Derivative Liabilities, Current |  |  | 3
Designated as Hedging Instrument |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current | [1] | 0 | 31
Derivative Asset, Noncurrent | [2] | 66 | 19
Derivative Asset |  | 66 | 50
Derivative Liabilities, Current | [3] | 363 | 330
Derivative Liabilities, Noncurrent | [4] | 19 | 268
Derivative Liabilities |  | 382 | 598
Designated as Hedging Instrument | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current | [5] | 0 | 0
Derivative Asset, Noncurrent | [6] | 66 | 2
Derivative Asset |  | 66 | 2
Derivative liabilities |  | 362 | 185
Derivative Liability, Noncurrent | [8] | 14 | 178
Derivative Liabilities |  | 376 | 363
Designated as Hedging Instrument | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 0 | 30
Derivative Asset, Noncurrent |  | 0 | 1
Derivative Liabilities, Current |  | 0 | 6
Derivative Liabilities, Noncurrent |  | 0 | 1
Designated as Hedging Instrument | Commodity | 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 |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 0 | 1
Derivative Asset, Noncurrent |  | 66 | 10
Derivative Liabilities, Current |  | 363 | 321
Derivative Liabilities, Noncurrent |  | 19 | 267
Designated as Hedging Instrument | Interest rate | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  |  | 0
Derivative Asset, Noncurrent |  | 66 | 2
Derivative liabilities |  | 362 | 185
Derivative Liability, Noncurrent |  | 14 | 178
Designated as Hedging Instrument | Foreign currency |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Noncurrent |  |  | 8
Derivative Liabilities, Current |  |  | 3
Fair Value - Derivatives not under Hedge Accounting |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current | [1] | 67 | 37
Derivative Asset, Noncurrent | [2] | 264 | 6
Derivative Asset |  | 331 | 43
Derivative Liabilities, Current | [3] | 52 | 78
Derivative Liabilities, Noncurrent | [4] | 52 | 64
Derivative Liabilities |  | 104 | 142
Fair Value - Derivatives not under Hedge Accounting | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current | [5] | 22 | 20
Derivative Asset, Noncurrent | [6] | 93 | 2
Derivative Asset |  | 115 | 22
Derivative liabilities |  | 28 | 58
Derivative Liability, Noncurrent | [8] | 1 | 45
Derivative Liabilities |  | 29 | 103
Fair Value - Derivatives not under Hedge Accounting | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 58 | 37
Derivative Asset, Noncurrent |  | 109 | 6
Derivative Liabilities, Current |  | 42 | 77
Derivative Liabilities, Noncurrent |  | 13 | 47
Fair Value - Derivatives not under Hedge Accounting | Commodity | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 22 | 20
Derivative Asset, Noncurrent |  | 93 | 2
Derivative liabilities |  | 28 | 58
Derivative Liability, Noncurrent |  | 1 | 45
Fair Value - Derivatives not under Hedge Accounting | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 9 | 0
Derivative Asset, Noncurrent |  | 155 | 0
Derivative Liabilities, Current |  | 10 | 1
Derivative Liabilities, Noncurrent |  | 39 | 17
Fair Value - Derivatives not under Hedge Accounting | Interest rate | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  |  | 0
Derivative Asset, Noncurrent |  | 0 | 0
Derivative liabilities |  | 0 | 0
Derivative Liability, Noncurrent |  | $ 0 | 0
Fair Value - Derivatives not under Hedge Accounting | Foreign currency |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Noncurrent |  |  | 0
Derivative Liabilities, Current |  |  | $ 0
[1] | Current derivative assets include $63 million and $61 million in other current assets in Dominion Energy’s Consolidated Balance Sheets as of December 31, 2020 and 2019, respectively. The remainder is recorded in current assets held for sale in Dominion Energy’s Consolidated Balance Sheets.
[2] | Noncurrent derivative assets include $330 million and $16 million in other deferred charges and other assets in Dominion Energy’s Consolidated Balance Sheets as of December 31, 2020 and 2019, respectively. The remainder is recorded in noncurrent assets held for sale in Dominion Energy’s Consolidated Balance Sheets.
[3] | Current derivative liabilities include $412 million and $394 million in other current liabilities in Dominion Energy’s Consolidated Balance Sheets as of December 31, 2020 and 2019, respectively. The remainder is recorded in current liabilities held for sale in Dominion Energy’s Consolidated Balance Sheets.
[4] | Noncurrent derivative liabilities include $71 million and $329 million in other deferred credits and other liabilities in Dominion Energy’s Consolidated Balance Sheets as of December 31, 2020 and 2019, respectively. The remainder is recorded in noncurrent liabilities held for sale in Dominion Energy’s Consolidated Balance Sheets.
[5] | Current derivative assets are presented in other current assets in Virginia Power’s Consolidated Balance Sheets.
[6] | Noncurrent derivative assets are presented in other deferred charges and other assets in Virginia Power’s Consolidated Balance Sheets.
[7] | See Note 25 for amounts attributable to affiliates.
[8] | Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Virginia Power’s Consolidated Balance Sheets.

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