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Derivatives and Hedge Accounting Activities (Fair Value of Derivatives) (Detail) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | $ 244 |  | $ 307 |
Derivative Liabilities |  | 90 |  | 284 |
Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 129 | [1] | 166 |
Derivative Liabilities |  | 23 |  | 66 |
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 44 |  | 32 |
Derivative Liabilities |  | 1 |  | 8 |
Current Assets |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 94 | [2] | 169 | [3]
Current Assets | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset | [3] | 50 |  | 75 |
Current Assets | Commodity |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 78 |  | 163 |
Current Assets | Commodity | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 48 |  | 75 |
Current Assets | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 16 |  | 6 |
Current Assets | Interest rate | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 2 |  |  |
Noncurrent Assets |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset | [4] | 150 |  | 138 |
Noncurrent Assets | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 79 |  | 91 | [1]
Noncurrent Assets | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset | [5] | 44 |  | 32 |
Noncurrent Assets | Commodity |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 78 |  | 95 |
Noncurrent Assets | Commodity | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 75 |  | 91 |
Noncurrent Assets | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 28 |  | 11 |
Noncurrent Assets | Interest rate | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 4 |  |  |
Noncurrent Assets | Foreign currency |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 44 |  | 32 |
Noncurrent Assets | Foreign currency | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 44 |  | 32 |
Current Liabilities |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 49 | [6] | 250 | [7]
Current Liabilities | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities | [7] | 20 |  | 53 |
Current Liabilities | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities | [8] | 1 |  | 8 |
Current Liabilities | Commodity |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 29 |  | 195 |
Current Liabilities | Commodity | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 9 |  | 9 |
Current Liabilities | Commodity | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  |  |  | 6 |
Current Liabilities | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 19 |  | 53 |
Current Liabilities | Interest rate | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 11 |  | 44 |
Current Liabilities | Foreign currency |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 1 |  | 2 |
Current Liabilities | Foreign currency | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 1 |  | 2 |
Noncurrent Liabilities [Member] |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities | [9] | 41 |  | 34 |
Noncurrent Liabilities [Member] | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities | [10] | 3 |  | 13 |
Noncurrent Liabilities [Member] | Commodity |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 2 |  | 2 |
Noncurrent Liabilities [Member] | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 39 |  | 32 |
Noncurrent Liabilities [Member] | Interest rate | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 3 |  | 13 |
Fair Value - Derivatives under Hedge Accounting [Member] |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 106 |  | 54 |
Derivative Liabilities |  | 72 |  | 191 |
Fair Value - Derivatives under Hedge Accounting [Member] | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset | [1] | 6 |  |  |
Derivative Liabilities |  | 14 |  | 57 |
Fair Value - Derivatives under Hedge Accounting [Member] | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 44 |  | 32 |
Derivative Liabilities |  | 1 |  | 8 |
Fair Value - Derivatives under Hedge Accounting [Member] | Current Assets |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 33 | [2] | 11 | [3]
Fair Value - Derivatives under Hedge Accounting [Member] | Current Assets | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset | [3] | 2 |  |  |
Fair Value - Derivatives under Hedge Accounting [Member] | Current Assets | Commodity |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 17 |  | 5 |
Fair Value - Derivatives under Hedge Accounting [Member] | Current Assets | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 16 |  | 6 |
Fair Value - Derivatives under Hedge Accounting [Member] | Current Assets | Interest rate | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 2 |  |  |
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Assets |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset | [4] | 73 |  | 43 |
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Assets | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 4 |  |  |
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Assets | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset | [5] | 44 |  | 32 |
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Assets | Commodity |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 1 |  |  |
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Assets | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 28 |  | 11 |
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Assets | Interest rate | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 4 |  |  |
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Assets | Foreign currency |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 44 |  | 32 |
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Assets | Foreign currency | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 44 |  | 32 |
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 32 | [6] | 158 | [7]
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities | [7] | 11 |  | 44 |
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities | [8] | 1 |  | 8 |
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Commodity |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 12 |  | 103 |
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Commodity | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  |  |  | 6 |
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 19 |  | 53 |
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Interest rate | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 11 |  | 44 |
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Foreign currency |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 1 |  | 2 |
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Foreign currency | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 1 |  | 2 |
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Liabilities [Member] |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities | [9] | 40 |  | 33 |
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Liabilities [Member] | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities | [10] | 3 |  | 13 |
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Liabilities [Member] | Commodity |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 1 |  | 1 |
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Liabilities [Member] | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 39 |  | 32 |
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Liabilities [Member] | Interest rate | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 3 |  | 13 |
Fair Value ? Derivatives not under Hedge Accounting |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 138 |  | 253 |
Derivative Liabilities |  | 18 |  | 93 |
Fair Value ? Derivatives not under Hedge Accounting | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 123 | [1] | 166 |
Derivative Liabilities |  | 9 |  | 9 |
Fair Value ? Derivatives not under Hedge Accounting | Current Assets |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 61 | [2] | 158 | [3]
Fair Value ? Derivatives not under Hedge Accounting | Current Assets | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset | [3] | 48 |  | 75 |
Fair Value ? Derivatives not under Hedge Accounting | Current Assets | Commodity |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 61 |  | 158 |
Fair Value ? Derivatives not under Hedge Accounting | Current Assets | Commodity | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 48 |  | 75 |
Fair Value ? Derivatives not under Hedge Accounting | Noncurrent Assets |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset | [4] | 77 |  | 95 |
Fair Value ? Derivatives not under Hedge Accounting | Noncurrent Assets | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 75 |  | 91 | [1]
Fair Value ? Derivatives not under Hedge Accounting | Noncurrent Assets | Commodity |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 77 |  | 95 |
Fair Value ? Derivatives not under Hedge Accounting | Noncurrent Assets | Commodity | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 75 |  | 91 |
Fair Value ? Derivatives not under Hedge Accounting | Current Liabilities |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 17 | [6] | 92 | [7]
Fair Value ? Derivatives not under Hedge Accounting | Current Liabilities | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities | [7] | 9 |  | 9 |
Fair Value ? Derivatives not under Hedge Accounting | Current Liabilities | Commodity |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 17 |  | 92 |
Fair Value ? Derivatives not under Hedge Accounting | Current Liabilities | Commodity | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 9 |  | 9 |
Fair Value ? Derivatives not under Hedge Accounting | Noncurrent Liabilities [Member] |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities | [9] | 1 |  | 1 |
Fair Value ? Derivatives not under Hedge Accounting | Noncurrent Liabilities [Member] | Commodity |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | $ 1 |  | $ 1 |
[1] | Noncurrent derivative assets are presented in other deferred charges and other assets in Virginia Power's Consolidated Balance Sheets.
[2] | Current derivative assets are presented in other current assets in Dominion Energy’s Consolidated Balance Sheets.
[3] | Current derivative assets are presented in other current assets in Virginia Power's 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 derivatives assets are presented in other deferred charges and other assets in Dominion Energy Gas’ Consolidated Balance Sheets.
[6] | Current derivative liabilities are presented in other current liabilities in Dominion Energy's Consolidated Balance Sheets.
[7] | Current derivative liabilities are presented in other current liabilities in Virginia Power's Consolidated Balance Sheets.
[8] | Current derivative liabilities are presented in other current liabilities in Dominion Energy Gas' Consolidated Balance Sheets.
[9] | Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Dominion Energy’s Consolidated Balance Sheets.
[10] | Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Virginia Power’s Consolidated Balance Sheets.

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