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Derivatives and Hedge Accounting Activities (Fair Value of Derivatives) (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | $ 294 |  | $ 307 |
Derivative Liabilities |  | 279 |  | 284 |
Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 93 |  | 166 |
Derivative Liabilities |  | 103 |  | 66 |
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 31 |  | 33 |
Derivative Liabilities |  | 19 |  | 8 |
Current Assets |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset | [1] | 223 |  | 169 |
Current Assets | Commodity |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 209 |  | 163 |
Current Assets | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 14 |  | 6 |
Current Assets | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset | [2] | 63 |  | 75 |
Current Assets | Virginia Electric and Power Company | Commodity |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 60 |  | 75 |
Current Assets | Virginia Electric and Power Company | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 3 |  |  |
Current Assets | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset | [3] | 5 |  |  |
Current Assets | Dominion Energy Gas Holdings, LLC | Commodity |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 3 |  |  |
Current Assets | Dominion Energy Gas Holdings, LLC | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 2 |  |  |
Noncurrent Assets |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset | [4] | 71 |  | 138 |
Noncurrent Assets | Commodity |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 41 |  | 95 |
Noncurrent Assets | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 4 |  | 11 |
Noncurrent Assets | Foreign currency |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 26 |  | 32 |
Noncurrent Assets | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset | [5] | 30 |  | 91 |
Noncurrent Assets | Virginia Electric and Power Company | Commodity |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 30 |  | 91 |
Noncurrent Assets | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset | [6] | 26 |  | 33 |
Noncurrent Assets | Dominion Energy Gas Holdings, LLC | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  |  |  | 1 |
Noncurrent Assets | Dominion Energy Gas Holdings, LLC | Foreign currency |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 26 |  | 32 |
Current Liabilities |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities | [7] | 157 |  | 250 |
Current Liabilities | Commodity |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 129 |  | 195 |
Current Liabilities | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 26 |  | 53 |
Current Liabilities | Foreign currency |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 2 |  | 2 |
Current Liabilities | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities | [8] | 25 |  | 53 |
Current Liabilities | Virginia Electric and Power Company | Commodity |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 15 |  | 9 |
Current Liabilities | Virginia Electric and Power Company | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 10 |  | 44 |
Current Liabilities | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 11 | [9] | 8 | [10]
Current Liabilities | Dominion Energy Gas Holdings, LLC | Commodity |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  |  |  | 6 |
Current Liabilities | Dominion Energy Gas Holdings, LLC | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 9 |  |  |
Current Liabilities | Dominion Energy Gas Holdings, LLC | Foreign currency |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 2 |  | 2 |
Noncurrent Liabilities |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities | [11] | 122 |  | 34 |
Noncurrent Liabilities | Commodity |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 6 |  | 2 |
Noncurrent Liabilities | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 116 |  | 32 |
Noncurrent Liabilities | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities | [12] | 78 |  | 13 |
Noncurrent Liabilities | Virginia Electric and Power Company | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 78 |  | 13 |
Noncurrent Liabilities | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities | [13] | 8 |  |  |
Noncurrent Liabilities | Dominion Energy Gas Holdings, LLC | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 8 |  |  |
Designated as Hedging Instrument |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 105 |  | 54 |
Derivative Liabilities |  | 166 |  | 191 |
Designated as Hedging Instrument | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 3 |  |  |
Derivative Liabilities |  | 88 |  | 57 |
Designated as Hedging Instrument | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 31 |  | 33 |
Derivative Liabilities |  | 19 |  | 8 |
Designated as Hedging Instrument | Current Assets |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset | [1] | 69 |  | 11 |
Designated as Hedging Instrument | Current Assets | Commodity |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 55 |  | 5 |
Designated as Hedging Instrument | Current Assets | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 14 |  | 6 |
Designated as Hedging Instrument | Current Assets | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset | [2] | 3 |  |  |
Designated as Hedging Instrument | Current Assets | Virginia Electric and Power Company | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 3 |  |  |
Designated as Hedging Instrument | Current Assets | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset | [3] | 5 |  |  |
Designated as Hedging Instrument | Current Assets | Dominion Energy Gas Holdings, LLC | Commodity |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 3 |  |  |
Designated as Hedging Instrument | Current Assets | Dominion Energy Gas Holdings, LLC | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 2 |  |  |
Designated as Hedging Instrument | Noncurrent Assets |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset | [4] | 36 |  | 43 |
Designated as Hedging Instrument | Noncurrent Assets | Commodity |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 6 |  |  |
Designated as Hedging Instrument | Noncurrent Assets | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 4 |  | 11 |
Designated as Hedging Instrument | Noncurrent Assets | Foreign currency |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 26 |  | 32 |
Designated as Hedging Instrument | Noncurrent Assets | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset | [6] | 26 |  | 33 |
Designated as Hedging Instrument | Noncurrent Assets | Dominion Energy Gas Holdings, LLC | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  |  |  | 1 |
Designated as Hedging Instrument | Noncurrent Assets | Dominion Energy Gas Holdings, LLC | Foreign currency |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 26 |  | 32 |
Designated as Hedging Instrument | Current Liabilities |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities | [7] | 45 |  | 158 |
Designated as Hedging Instrument | Current Liabilities | Commodity |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 17 |  | 103 |
Designated as Hedging Instrument | Current Liabilities | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 26 |  | 53 |
Designated as Hedging Instrument | Current Liabilities | Foreign currency |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 2 |  | 2 |
Designated as Hedging Instrument | Current Liabilities | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities | [8] | 10 |  | 44 |
Designated as Hedging Instrument | Current Liabilities | Virginia Electric and Power Company | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 10 |  | 44 |
Designated as Hedging Instrument | Current Liabilities | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 11 | [9] | 8 | [10]
Designated as Hedging Instrument | Current Liabilities | Dominion Energy Gas Holdings, LLC | Commodity |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  |  |  | 6 |
Designated as Hedging Instrument | Current Liabilities | Dominion Energy Gas Holdings, LLC | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 9 |  |  |
Designated as Hedging Instrument | Current Liabilities | Dominion Energy Gas Holdings, LLC | Foreign currency |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 2 |  | 2 |
Designated as Hedging Instrument | Noncurrent Liabilities |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities | [11] | 121 |  | 33 |
Designated as Hedging Instrument | Noncurrent Liabilities | Commodity |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 5 |  | 1 |
Designated as Hedging Instrument | Noncurrent Liabilities | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 116 |  | 32 |
Designated as Hedging Instrument | Noncurrent Liabilities | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities | [12] | 78 |  | 13 |
Designated as Hedging Instrument | Noncurrent Liabilities | Virginia Electric and Power Company | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 78 |  | 13 |
Designated as Hedging Instrument | Noncurrent Liabilities | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities | [13] | 8 |  |  |
Designated as Hedging Instrument | Noncurrent Liabilities | Dominion Energy Gas Holdings, LLC | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 8 |  |  |
Fair Value - Derivatives not under Hedge Accounting |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 189 |  | 253 |
Derivative Liabilities |  | 113 |  | 93 |
Fair Value - Derivatives not under Hedge Accounting | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 90 |  | 166 |
Derivative Liabilities |  | 15 |  | 9 |
Fair Value - Derivatives not under Hedge Accounting | Current Assets |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset | [1] | 154 |  | 158 |
Fair Value - Derivatives not under Hedge Accounting | Current Assets | Commodity |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 154 |  | 158 |
Fair Value - Derivatives not under Hedge Accounting | Current Assets | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset | [2] | 60 |  | 75 |
Fair Value - Derivatives not under Hedge Accounting | Current Assets | Virginia Electric and Power Company | Commodity |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 60 |  | 75 |
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Assets |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset | [4] | 35 |  | 95 |
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Assets | Commodity |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 35 |  | 95 |
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Assets | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset | [5] | 30 |  | 91 |
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Assets | Virginia Electric and Power Company | Commodity |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 30 |  | 91 |
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities | [7] | 112 |  | 92 |
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities | Commodity |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 112 |  | 92 |
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities | [8] | 15 |  | 9 |
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities | Virginia Electric and Power Company | Commodity |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 15 |  | 9 |
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Liabilities |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities | [11] | 1 |  | 1 |
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Liabilities | Commodity |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | $ 1 |  | $ 1 |
[1] | Current derivative assets are presented in other current assets in Dominion Energy’s Consolidated Balance Sheets.
[2] | Current derivative assets are presented in other current assets in Virginia Power’s Consolidated Balance Sheets.
[3] | Current derivative assets include $2 million in other current assets, with the remainder recorded in current assets of discontinued operations in Dominion Energy Gas’ Consolidated Balance Sheets.
[4] | Noncurrent derivative assets are presented in other deferred charges and other assets in Dominion Energy’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] | Noncurrent derivative assets are presented in other deferred charges and other assets in Dominion Energy Gas’ Consolidated Balance Sheets.
[7] | Current derivative liabilities are presented in other current liabilities in Dominion Energy’s Consolidated Balance Sheets.
[8] | Current derivative liabilities are presented in other current liabilities in Virginia Power’s Consolidated Balance Sheets.
[9] | Current derivative liabilities are presented in other current liabilities and current liabilities of discontinued operations in Dominion Energy Gas’ Consolidated Balance Sheets.
[10] | Current derivative liabilities include $2 million in other current liabilities, with the remainder recorded in current liabilities of discontinued operations in Dominion Energy Gas’ Consolidated Balance Sheets.
[11] | Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Dominion Energy’s Consolidated Balance Sheets.
[12] | Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Virginia Power’s Consolidated Balance Sheets.
[13] | Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Dominion Energy Gas’ Consolidated Balance Sheets.

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