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Derivatives and Hedge Accounting Activities (Fair Value of Derivatives) (Detail) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Current | [1] | $ 91 | $ 68 |
Derivative Asset, Noncurrent | [2] | 59 | 25 |
Derivative Asset |  | 150 | 93 |
Derivative Liabilities, Current |  | 793 | 408 | [3]
Derivative Liabilities, Noncurrent |  | 853 | 332 | [3]
Derivative Liabilities |  | 1,646 | 740 |
Virginia Electric and Power Company |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Current | [4] | 14 | 20 |
Derivative Asset, Noncurrent | [5] | 37 | 4 |
Derivative Asset |  | 51 | 24 |
Derivative Liabilities, Current | [6] | 481 | 243 | [7]
Derivative Liabilities, Noncurrent | [8] | 534 | 223 |
Derivative Liabilities |  | 1,015 | 466 |
Dominion Energy Gas Holdings, LLC |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Noncurrent | [9] |  | 8 |
Derivative Asset |  |  | 8 |
Derivative Liabilities, Current | [10] | 69 | 33 |
Derivative Liabilities, Noncurrent | [11] | 138 | 53 |
Derivative Liabilities |  | 207 | 86 |
Commodity |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Current |  | 80 | 67 |
Derivative Asset, Noncurrent |  | 41 | 7 |
Derivative Liabilities, Current |  | 45 | 83 |
Derivative Liabilities, Noncurrent |  | 4 | 48 |
Commodity | Virginia Electric and Power Company |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Current |  | 14 | 20 |
Derivative Asset, Noncurrent |  | 37 | 2 |
Derivative Liabilities, Current |  | 23 | 58 |
Derivative Liabilities, Noncurrent |  | 1 | 45 |
Interest rate |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Current |  | 11 | 1 |
Derivative Asset, Noncurrent |  | 18 | 10 |
Derivative Liabilities, Current |  | 747 | 322 |
Derivative Liabilities, Noncurrent |  | 833 | 284 |
Interest rate | Virginia Electric and Power Company |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Noncurrent |  |  | 2 |
Derivative Liabilities, Current |  | 458 | 185 |
Derivative Liabilities, Noncurrent |  | 533 | 178 |
Interest rate | Dominion Energy Gas Holdings, LLC |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Liabilities, Current |  | 68 | 30 |
Derivative Liabilities, Noncurrent |  | 122 | 53 |
Foreign currency |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Noncurrent |  |  | 8 |
Derivative Liabilities, Current |  | 1 | 3 |
Derivative Liabilities, Noncurrent |  | 16 |  |
Foreign currency | Dominion Energy Gas Holdings, LLC |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Noncurrent |  |  | 8 |
Derivative Liabilities, Current |  | 1 | 3 |
Derivative Liabilities, Noncurrent |  | 16 |  |
Designated as Hedging Instrument |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Current | [1] |  | 31 |
Derivative Asset, Noncurrent | [2] |  | 19 |
Derivative Asset |  |  | 50 |
Derivative Liabilities, Current |  | 516 | 330 |
Derivative Liabilities, Noncurrent |  | 738 | 268 |
Derivative Liabilities |  | 1,254 | 598 |
Designated as Hedging Instrument | Virginia Electric and Power Company |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Noncurrent | [5] |  | 2 |
Derivative Asset |  |  | 2 |
Derivative Liabilities, Current |  | 458 | 185 |
Derivative Liabilities, Noncurrent | [8] | 533 | 178 |
Derivative Liabilities |  | 991 | 363 |
Designated as Hedging Instrument | Dominion Energy Gas Holdings, LLC |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Noncurrent | [9] |  | 8 |
Derivative Asset |  |  | 8 |
Derivative Liabilities, Current | [10] | 58 | 33 |
Derivative Liabilities, Noncurrent | [11] | 135 | 53 |
Derivative Liabilities |  | 193 | 86 |
Designated as Hedging Instrument | Commodity |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Current |  |  | 30 |
Derivative Asset, Noncurrent |  |  | 1 |
Derivative Liabilities, Current |  |  | 6 |
Derivative Liabilities, Noncurrent |  |  | 1 |
Designated as Hedging Instrument | Interest rate |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Current |  |  | 1 |
Derivative Asset, Noncurrent |  |  | 10 |
Derivative Liabilities, Current |  | 515 | 321 |
Derivative Liabilities, Noncurrent |  | 722 | 267 |
Designated as Hedging Instrument | Interest rate | Virginia Electric and Power Company |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Noncurrent |  |  | 2 |
Derivative Liabilities, Current |  | 458 | 185 |
Derivative Liabilities, Noncurrent |  | 533 | 178 |
Designated as Hedging Instrument | Interest rate | Dominion Energy Gas Holdings, LLC |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Liabilities, Current |  | 57 | 30 |
Derivative Liabilities, Noncurrent |  | 119 | 53 |
Designated as Hedging Instrument | Foreign currency |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Noncurrent |  |  | 8 |
Derivative Liabilities, Current |  | 1 | 3 |
Derivative Liabilities, Noncurrent |  | 16 |  |
Designated as Hedging Instrument | Foreign currency | Dominion Energy Gas Holdings, LLC |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Noncurrent |  |  | 8 |
Derivative Liabilities, Current |  | 1 | 3 |
Derivative Liabilities, Noncurrent |  | 16 |  |
Fair Value - Derivatives not under Hedge Accounting |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Current | [1] | 91 | 37 |
Derivative Asset, Noncurrent | [2] | 59 | 6 |
Derivative Asset |  | 150 | 43 |
Derivative Liabilities, Current |  | 277 | 78 |
Derivative Liabilities, Noncurrent |  | 115 | 64 |
Derivative Liabilities |  | 392 | 142 |
Fair Value - Derivatives not under Hedge Accounting | Virginia Electric and Power Company |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Current | [4] | 14 | 20 |
Derivative Asset, Noncurrent | [5] | 37 | 2 |
Derivative Asset |  | 51 | 22 |
Derivative Liabilities, Current |  | 23 | 58 |
Derivative Liabilities, Noncurrent | [8] | 1 | 45 |
Derivative Liabilities |  | 24 | 103 |
Fair Value - Derivatives not under Hedge Accounting | Dominion Energy Gas Holdings, LLC |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Liabilities, Current | [10] | 11 |  |
Derivative Liabilities, Noncurrent | [11] | 3 |  |
Derivative Liabilities |  | 14 |  |
Fair Value - Derivatives not under Hedge Accounting | Commodity |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Current |  | 80 | 37 |
Derivative Asset, Noncurrent |  | 41 | 6 |
Derivative Liabilities, Current |  | 45 | 77 |
Derivative Liabilities, Noncurrent |  | 4 | 47 |
Fair Value - Derivatives not under Hedge Accounting | Commodity | Virginia Electric and Power Company |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Current |  | 14 | 20 |
Derivative Asset, Noncurrent |  | 37 | 2 |
Derivative Liabilities, Current |  | 23 | 58 |
Derivative Liabilities, Noncurrent |  | 1 | 45 |
Fair Value - Derivatives not under Hedge Accounting | Interest rate |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Asset, Current |  | 11 |  |
Derivative Asset, Noncurrent |  | 18 |  |
Derivative Liabilities, Current |  | 232 | 1 |
Derivative Liabilities, Noncurrent |  | 111 | $ 17 |
Fair Value - Derivatives not under Hedge Accounting | Interest rate | Dominion Energy Gas Holdings, LLC |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Derivative Liabilities, Current |  | 11 |  |
Derivative Liabilities, Noncurrent |  | $ 3 |  |
[1] | Current derivative assets are presented in other current assets in Dominion Energy’s Consolidated Balance Sheets.
[2] | Noncurrent derivative assets are presented in other deferred charges and other assets 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 assets are presented in other current assets in Virginia Power’s Consolidated Balance Sheets.
[5] | Noncurrent derivative assets are presented in other deferred charges and other assets in Virginia Power’s Consolidated Balance Sheets.
[6] | See Note 19 for amounts attributable to affiliates.
[7] | Virginia Power’s Consolidated Balance Sheet at December 31, 2019 has been derived from the audited Consolidated Balance Sheet at that date.
[8] | Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Virginia Power’s Consolidated Balance Sheets.
[9] | Noncurrent derivatives assets are presented in other deferred charges and other assets in Dominion Energy Gas’ Consolidated Balance Sheets.
[10] | Current derivative liabilities are presented in other current liabilities in Dominion Energy Gas’ Consolidated Balance Sheets.
[11] | Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Dominion Energy Gas’ Consolidated Balance Sheets.

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