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Derivatives and Hedge Accounting Activities (Fair Value of Derivatives) (Detail) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | $ 173 | $ 294
Derivative Liabilities |  | 369 | 279
Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 66 | 93
Derivative Liabilities |  | 190 | 103
Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 13 | 29
Derivative Liabilities |  | 42 | 19
Current Assets |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [1] | 96 | 223
Current Assets | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [2] | 24 | 63
Current Assets | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [3] |  | 3
Current Assets | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 94 | 209
Current Assets | Commodity | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 24 | 60
Current Assets | Commodity | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  |  | 3
Current Assets | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 2 | 14
Current Assets | Interest rate | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  |  | 3
Noncurrent Assets |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [4] | 77 | 71
Noncurrent Assets | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [5] | 42 | 30
Noncurrent Assets | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [6] | 13 | 26
Noncurrent Assets | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 63 | 41
Noncurrent Assets | Commodity | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 42 | 30
Noncurrent Assets | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 1 | 4
Noncurrent Assets | Foreign currency |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 13 | 26
Noncurrent Assets | Foreign currency | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 13 | 26
Current Liabilities |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [7] | 119 | 157
Current Liabilities | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [8] | 50 | 25
Current Liabilities | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [9] | 19 | 11
Current Liabilities | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 38 | 129
Current Liabilities | Commodity | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 6 | 15
Current Liabilities | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 80 | 26
Current Liabilities | Interest rate | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 44 | 10
Current Liabilities | Interest rate | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 18 | 9
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 | [10] | 250 | 122
Noncurrent Liabilities [Member] | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [11] | 140 | 78
Noncurrent Liabilities [Member] | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [12] | 23 | 8
Noncurrent Liabilities [Member] | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 7 | 6
Noncurrent Liabilities [Member] | Commodity | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 3 |
Noncurrent Liabilities [Member] | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 243 | 116
Noncurrent Liabilities [Member] | Interest rate | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 137 | 78
Noncurrent Liabilities [Member] | Interest rate | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 23 | 8
Designated as Hedging Instrument |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 66 | 105
Derivative Liabilities |  | 328 | 166
Designated as Hedging Instrument | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  |  | 3
Derivative Liabilities |  | 181 | 88
Designated as Hedging Instrument | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 13 | 29
Derivative Liabilities |  | 42 | 19
Designated as Hedging Instrument | Current Assets |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [1] | 37 | 69
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 | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [3] |  | 3
Designated as Hedging Instrument | Current Assets | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 35 | 55
Designated as Hedging Instrument | Current Assets | Commodity | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  |  | 3
Designated as Hedging Instrument | Current Assets | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 2 | 14
Designated as Hedging Instrument | Current Assets | Interest rate | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  |  | 3
Designated as Hedging Instrument | Noncurrent Assets |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [4] | 29 | 36
Designated as Hedging Instrument | Noncurrent Assets | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [6] | 13 | 26
Designated as Hedging Instrument | Noncurrent Assets | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 15 | 6
Designated as Hedging Instrument | Noncurrent Assets | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 1 | 4
Designated as Hedging Instrument | Noncurrent Assets | Foreign currency |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 13 | 26
Designated as Hedging Instrument | Noncurrent Assets | Foreign currency | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 13 | 26
Designated as Hedging Instrument | Current Liabilities |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [7] | 97 | 45
Designated as Hedging Instrument | Current Liabilities | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [8] | 44 | 10
Designated as Hedging Instrument | Current Liabilities | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [9] | 19 | 11
Designated as Hedging Instrument | Current Liabilities | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 17 | 17
Designated as Hedging Instrument | Current Liabilities | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 79 | 26
Designated as Hedging Instrument | Current Liabilities | Interest rate | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 44 | 10
Designated as Hedging Instrument | Current Liabilities | Interest rate | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 18 | 9
Designated as Hedging Instrument | Current Liabilities | Foreign currency |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 1 | 2
Designated as Hedging Instrument | Current Liabilities | Foreign currency | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 1 | 2
Designated as Hedging Instrument | Noncurrent Liabilities [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [10] | 231 | 121
Designated as Hedging Instrument | Noncurrent Liabilities [Member] | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [11] | 137 | 78
Designated as Hedging Instrument | Noncurrent Liabilities [Member] | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [12] | 23 | 8
Designated as Hedging Instrument | Noncurrent Liabilities [Member] | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 1 | 5
Designated as Hedging Instrument | Noncurrent Liabilities [Member] | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 230 | 116
Designated as Hedging Instrument | Noncurrent Liabilities [Member] | Interest rate | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 137 | 78
Designated as Hedging Instrument | Noncurrent Liabilities [Member] | Interest rate | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 23 | 8
Fair Value - Derivatives not under Hedge Accounting |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 107 | 189
Derivative Liabilities |  | 41 | 113
Fair Value - Derivatives not under Hedge Accounting | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 66 | 90
Derivative Liabilities |  | 9 | 15
Fair Value - Derivatives not under Hedge Accounting | Current Assets |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [1] | 59 | 154
Fair Value - Derivatives not under Hedge Accounting | Current Assets | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [2] | 24 | 60
Fair Value - Derivatives not under Hedge Accounting | Current Assets | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 59 | 154
Fair Value - Derivatives not under Hedge Accounting | Current Assets | Commodity | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 24 | 60
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Assets |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [4] | 48 | 35
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Assets | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [5] | 42 | 30
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Assets | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 48 | 35
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Assets | Commodity | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 42 | 30
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [7] | 22 | 112
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [8] | 6 | 15
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 21 | 112
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities | Commodity | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 6 | 15
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 1 |
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Liabilities [Member] |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [10] | 19 | 1
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Liabilities [Member] | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [11] | 3 |
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Liabilities [Member] | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 6 | $ 1
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Liabilities [Member] | Commodity | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 3 |
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Liabilities [Member] | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | $ 13 |
[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 are presented in other current assets 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 derivatives 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 in Dominion Energy Gas’ Consolidated Balance Sheets.
[10] | Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Dominion Energy’s Consolidated Balance Sheets.
[11] | Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Virginia Power’s Consolidated Balance Sheets.
[12] | Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Dominion Energy Gas’ Consolidated Balance Sheets.

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