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Derivatives and Hedge Accounting Activities (Fair Value of Derivatives) (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | $ 307 | $ 279
Derivative Liabilities |  | 284 | 155
Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 166 | 194
Derivative Liabilities |  | 66 | 31
Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 32 |
Derivative Liabilities |  | 8 | 11
Current Assets |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [1] | 169 | 140
Current Assets | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 163 | 130
Current Assets | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 6 | 10
Current Assets | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [2] | 75 | 66
Current Assets | Virginia Electric and Power Company | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 75 | 60
Current Assets | Virginia Electric and Power Company | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  |  | 6
Noncurrent Assets |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [3] | 138 | 139
Noncurrent Assets | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 95 | 132
Noncurrent Assets | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 11 | 7
Noncurrent Assets | Foreign currency |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 32 |
Noncurrent Assets | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 91 | 128
Noncurrent Assets | Virginia Electric and Power Company | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 91 | 128
Noncurrent Assets | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [4] | 32 |
Noncurrent Assets | Dominion Energy Gas Holdings, LLC | Foreign currency |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 32 |
Current Liabilities |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [5] | 250 | 128
Current Liabilities | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 195 | 92
Current Liabilities | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 53 | 33
Current Liabilities | Foreign currency |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 2 | 3
Current Liabilities | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [6] | 53 | 18
Current Liabilities | Virginia Electric and Power Company | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 9 | 10
Current Liabilities | Virginia Electric and Power Company | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 44 | 8
Current Liabilities | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [7] | 8 | 7
Current Liabilities | Dominion Energy Gas Holdings, LLC | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 6 | 4
Current Liabilities | Dominion Energy Gas Holdings, LLC | Foreign currency |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 2 | 3
Noncurrent Liabilities [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [8] | 34 | 27
Noncurrent Liabilities [Member] | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 2 | 4
Noncurrent Liabilities [Member] | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 32 | 20
Noncurrent Liabilities [Member] | Foreign currency |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  |  | 3
Noncurrent Liabilities [Member] | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [9] | 13 | 13
Noncurrent Liabilities [Member] | Virginia Electric and Power Company | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 13 | 13
Noncurrent Liabilities [Member] | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [10] |  | 4
Noncurrent Liabilities [Member] | Dominion Energy Gas Holdings, LLC | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  |  | 1
Noncurrent Liabilities [Member] | Dominion Energy Gas Holdings, LLC | Foreign currency |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  |  | 3
Fair Value - Derivatives under Hedge Accounting [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 54 | 46
Derivative Liabilities |  | 191 | 111
Fair Value - Derivatives under Hedge Accounting [Member] | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  |  | 6
Derivative Liabilities |  | 57 | 21
Fair Value - Derivatives under Hedge Accounting [Member] | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 32 |
Derivative Liabilities |  | 8 | 11
Fair Value - Derivatives under Hedge Accounting [Member] | Current Assets |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [1] | 11 | 39
Fair Value - Derivatives under Hedge Accounting [Member] | Current Assets | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 5 | 29
Fair Value - Derivatives under Hedge Accounting [Member] | Current Assets | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 6 | 10
Fair Value - Derivatives under Hedge Accounting [Member] | Current Assets | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [2] |  | 6
Fair Value - Derivatives under Hedge Accounting [Member] | Current Assets | Virginia Electric and Power Company | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  |  | 6
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Assets |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [3] | 43 | 7
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Assets | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 11 | 7
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Assets | Foreign currency |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 32 |
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Assets | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [4] | 32 |
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Assets | Dominion Energy Gas Holdings, LLC | Foreign currency |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 32 |
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [5] | 158 | 87
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 103 | 51
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 53 | 33
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Foreign currency |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 2 | 3
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [6] | 44 | 8
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Virginia Electric and Power Company | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 44 | 8
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [7] | 8 | 7
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Dominion Energy Gas Holdings, LLC | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 6 | 4
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Dominion Energy Gas Holdings, LLC | Foreign currency |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 2 | 3
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Liabilities [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [8] | 33 | 24
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 |  | 32 | 20
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Liabilities [Member] | Foreign currency |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  |  | 3
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Liabilities [Member] | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [9] | 13 | 13
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Liabilities [Member] | Virginia Electric and Power Company | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 13 | 13
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Liabilities [Member] | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [10] |  | 4
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Liabilities [Member] | Dominion Energy Gas Holdings, LLC | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  |  | 1
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Liabilities [Member] | Dominion Energy Gas Holdings, LLC | Foreign currency |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  |  | 3
Derivatives Not Designated as Hedging Instruments |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 253 | 233
Derivative Liabilities |  | 93 | 44
Derivatives Not Designated as Hedging Instruments | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 166 | 188
Derivative Liabilities |  | 9 | 10
Derivatives Not Designated as Hedging Instruments | Current Assets |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [1] | 158 | 101
Derivatives Not Designated as Hedging Instruments | Current Assets | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 158 | 101
Derivatives Not Designated as Hedging Instruments | Current Assets | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [2] | 75 | 60
Derivatives Not Designated as Hedging Instruments | Current Assets | Virginia Electric and Power Company | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 75 | 60
Derivatives Not Designated as Hedging Instruments | Noncurrent Assets |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [3] | 95 | 132
Derivatives Not Designated as Hedging Instruments | Noncurrent Assets | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 95 | 132
Derivatives Not Designated as Hedging Instruments | Noncurrent Assets | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 91 | 128
Derivatives Not Designated as Hedging Instruments | Noncurrent Assets | Virginia Electric and Power Company | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 91 | 128
Derivatives Not Designated as Hedging Instruments | Current Liabilities |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [5] | 92 | 41
Derivatives Not Designated as Hedging Instruments | Current Liabilities | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 92 | 41
Derivatives Not Designated as Hedging Instruments | Current Liabilities | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [6] | 9 | 10
Derivatives Not Designated as Hedging Instruments | Current Liabilities | Virginia Electric and Power Company | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 9 | 10
Derivatives Not Designated as Hedging Instruments | Noncurrent Liabilities [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [8] | 1 | 3
Derivatives Not Designated as Hedging Instruments | Noncurrent Liabilities [Member] | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | $ 1 | $ 3
[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] | Noncurrent derivative assets are presented in other deferred charges and other assets in Dominion Energy's Consolidated Balance Sheets.
[4] | Noncurrent derivative assets are presented in other deferred charges and other assets in Dominion Energy Gas' Consolidated Balance Sheets.
[5] | Current derivative liabilities are presented in other current liabilities in Dominion Energy's Consolidated Balance Sheets.
[6] | Current derivative liabilities are presented in other current liabilities in Virginia Power's Consolidated Balance Sheets.
[7] | Current derivative liabilities are presented in other current liabilities in Dominion Energy Gas' Consolidated Balance Sheets.
[8] | Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Dominion Energy's Consolidated Balance Sheets.
[9] | Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Virginia Power's Consolidated Balance Sheets.
[10] | Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Dominion Energy Gas' Consolidated Balance Sheets.

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