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Derivatives and Hedge Accounting Activities (Fair Value of Derivatives) (Detail) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Current | [1] | $ 98 | $ 68 |
Derivative Asset, Noncurrent | [2] | 154 | 25 |
Derivative Asset |  | 252 | 93 |
Derivative Liabilities, Current |  | 223 | 394 | [3]
Derivative Liabilities, Current | [4] | 239 | 408 |
Derivative Liabilities, Noncurrent |  | 537 | 329 | [3]
Derivative Liabilities, Noncurrent | [5] | 537 | 332 |
Derivative Liabilities |  | 776 | 740 |
Virginia Electric and Power Company |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Current | [6] | 48 | 20 |
Derivative Asset, Noncurrent | [7] | 97 | 4 |
Derivative Asset |  | 145 | 24 |
Derivative Liabilities, Current | [8] | 15 | 243 | [9]
Derivative Liabilities, Noncurrent | [10] | 476 | 223 |
Derivative Liabilities |  | 491 | 466 |
Commodity |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Current |  | 80 | 67 |
Derivative Asset, Noncurrent |  | 106 | 7 |
Derivative Liabilities, Current |  | 41 | 83 |
Derivative Liabilities, Noncurrent |  | 10 | 48 |
Commodity | Virginia Electric and Power Company |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Current |  | 48 | 20 |
Derivative Asset, Noncurrent |  | 97 | 2 |
Derivative Liabilities, Current |  | 15 | 58 |
Derivative Liabilities, Noncurrent |  | 1 | 45 |
Interest rate |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Current |  | 12 | 1 |
Derivative Asset, Noncurrent |  | 48 | 10 |
Derivative Liabilities, Current |  | 194 | 322 |
Derivative Liabilities, Noncurrent |  | 527 | 284 |
Interest rate | Virginia Electric and Power Company |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Noncurrent |  |  | 2 |
Derivative Liabilities, Current |  |  | 185 |
Derivative Liabilities, Noncurrent |  | 475 | 178 |
Foreign currency |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Current |  | 6 |  |
Derivative Asset, Noncurrent |  |  | 8 |
Derivative Liabilities, Current |  | 4 | 3 |
Designated as Hedging Instrument |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Current | [1] | 0 | 31 |
Derivative Asset, Noncurrent | [2] | 0 | 19 |
Derivative Asset |  | 0 | 50 |
Derivative Liabilities, Current | [4] | 0 | 330 |
Derivative Liabilities, Noncurrent | [5] | 482 | 268 |
Derivative Liabilities |  | 482 | 598 |
Designated as Hedging Instrument | Virginia Electric and Power Company |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Current | [6] | 0 | 0 |
Derivative Asset, Noncurrent | [7] | 0 | 2 |
Derivative Asset |  | 0 | 2 |
Derivative Liabilities, Current |  | 0 | 185 |
Derivative Liabilities, Noncurrent | [10] | 475 | 178 |
Derivative Liabilities |  | 475 | 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, Current |  | 0 | 0 |
Derivative Liabilities, Noncurrent |  | 0 | 0 |
Designated as Hedging Instrument | Interest rate |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Current |  | 0 | 1 |
Derivative Asset, Noncurrent |  | 0 | 10 |
Derivative Liabilities, Current |  | 0 | 321 |
Derivative Liabilities, Noncurrent |  | 482 | 267 |
Designated as Hedging Instrument | Interest rate | Virginia Electric and Power Company |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Noncurrent |  |  | 2 |
Derivative Liabilities, Current |  |  | 185 |
Derivative Liabilities, Noncurrent |  | 475 | 178 |
Designated as Hedging Instrument | Foreign currency |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Current |  | 0 |  |
Derivative Asset, Noncurrent |  |  | 8 |
Derivative Liabilities, Current |  | 0 | 3 |
Fair Value - Derivatives not under Hedge Accounting |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Current | [1] | 98 | 37 |
Derivative Asset, Noncurrent | [2] | 154 | 6 |
Derivative Asset |  | 252 | 43 |
Derivative Liabilities, Current | [4] | 239 | 78 |
Derivative Liabilities, Noncurrent | [5] | 55 | 64 |
Derivative Liabilities |  | 294 | 142 |
Fair Value - Derivatives not under Hedge Accounting | Virginia Electric and Power Company |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Current | [6] | 48 | 20 |
Derivative Asset, Noncurrent | [7] | 97 | 2 |
Derivative Asset |  | 145 | 22 |
Derivative Liabilities, Current |  | 15 | 58 |
Derivative Liabilities, Noncurrent | [10] | 1 | 45 |
Derivative Liabilities |  | 16 | 103 |
Fair Value - Derivatives not under Hedge Accounting | Commodity |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Current |  | 80 | 37 |
Derivative Asset, Noncurrent |  | 106 | 6 |
Derivative Liabilities, Current |  | 41 | 77 |
Derivative Liabilities, Noncurrent |  | 10 | 47 |
Fair Value - Derivatives not under Hedge Accounting | Commodity | Virginia Electric and Power Company |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Current |  | 48 | 20 |
Derivative Asset, Noncurrent |  | 97 | 2 |
Derivative Liabilities, Current |  | 15 | 58 |
Derivative Liabilities, Noncurrent |  | 1 | 45 |
Fair Value - Derivatives not under Hedge Accounting | Interest rate |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Current |  | 12 | 0 |
Derivative Asset, Noncurrent |  | 48 | 0 |
Derivative Liabilities, Current |  | 194 | 1 |
Derivative Liabilities, Noncurrent |  | 45 | 17 |
Fair Value - Derivatives not under Hedge Accounting | Interest rate | Virginia Electric and Power Company |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Noncurrent |  |  | 0 |
Derivative Liabilities, Current |  |  | 0 |
Derivative Liabilities, Noncurrent |  | 0 | 0 |
Fair Value - Derivatives not under Hedge Accounting | Foreign currency |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Current |  | 6 |  |
Derivative Asset, Noncurrent |  |  | 0 |
Derivative Liabilities, Current |  | $ 4 | $ 0 |
[1] | Current derivative assets include $87 million and $61 million in other current assets in Dominion Energy’s Consolidated Balance Sheets as of September 30, 2020 and December 31, 2019, respectively. The remainder is recorded in current assets held for sale in Dominion Energy’s Consolidated Balance Sheets.
[2] | Noncurrent derivative assets include $154 million and $16 million in other deferred charges and other assets in Dominion Energy’s Consolidated Balance Sheets as of September 30, 2020 and December 31, 2019, respectively. The remainder is recorded in noncurrent assets held for sale in Dominion Energy’s Consolidated Balance Sheets.
[3] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2019 has been derived from the audited Consolidated Balance Sheet at that date.
[4] | Current derivative liabilities include $16 million and $14 million at September 30, 2020 and December 31, 2019, respectively, presented in held for sale in Dominion Energy’s Consolidated Balance Sheets.
[5] | Noncurrent derivative liabilities include $3 million at December 31, 2019 presented in held for sale in Dominion Energy’s Consolidated Balance Sheets.
[6] | Current derivative assets are presented in other current assets in Virginia Power’s Consolidated Balance Sheets.
[7] | Noncurrent derivative assets are presented in other deferred charges and other assets in Virginia Power’s Consolidated Balance Sheets.
[8] | See Note 19 for amounts attributable to affiliates.
[9] | Virginia Power’s Consolidated Balance Sheet at December 31, 2019 has been derived from the audited Consolidated Balance Sheet at that date.
[10] | Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Virginia Power’s Consolidated Balance Sheets.

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