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Derivatives and Hedge Accounting Activities (Fair Value of Derivatives) (Detail) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | $ 209 | $ 294
Derivative Liabilities |  | 626 | 279
Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 83 | 93
Derivative Liabilities |  | 358 | 103
Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 16 | 31
Derivative Liabilities |  | 77 | 19
Current Assets |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 113 | 223
Current Assets | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [1] | 24 | 63
Current Assets | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [2] | 2 | 5
Current Assets | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 113 | 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 |  | 2 | 3
Current Assets | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  |  | 14
Current Assets | Interest rate | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  |  | 3
Current Assets | Interest rate | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  |  | 2
Noncurrent Assets |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 96 | 71
Noncurrent Assets | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [3] | 59 | 30
Noncurrent Assets | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [4] | 14 | 26
Noncurrent Assets | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 75 | 41
Noncurrent Assets | Commodity | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 59 | 30
Noncurrent Assets | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 7 | 4
Noncurrent Assets | Foreign currency |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 14 | 26
Noncurrent Assets | Foreign currency | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 14 | 26
Current Liabilities |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 201 | 157
Current Liabilities | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [5] | 124 | 25
Current Liabilities | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [6] | 34 | 11
Current Liabilities | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 58 | 129
Current Liabilities | Commodity | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 20 | 15
Current Liabilities | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 143 | 26
Current Liabilities | Interest rate | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 104 | 10
Current Liabilities | Interest rate | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 34 | 9
Current Liabilities | Foreign currency |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  |  | 2
Current Liabilities | Foreign currency | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  |  | 2
Noncurrent Liabilities |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 425 | 122
Noncurrent Liabilities | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [7] | 234 | 78
Noncurrent Liabilities | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [8] | 43 | 8
Noncurrent Liabilities | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 11 | 6
Noncurrent Liabilities | Commodity | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 6 |
Noncurrent Liabilities | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 414 | 116
Noncurrent Liabilities | Interest rate | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 228 | 78
Noncurrent Liabilities | Interest rate | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 43 | 8
Designated as Hedging Instrument |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 74 | 105
Derivative Liabilities |  | 551 | 166
Designated as Hedging Instrument | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  |  | 3
Derivative Liabilities |  | 332 | 88
Designated as Hedging Instrument | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 16 | 31
Derivative Liabilities |  | 77 | 19
Designated as Hedging Instrument | Current Assets |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [9] | 43 | 69
Designated as Hedging Instrument | Current Assets | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [1] |  | 3
Designated as Hedging Instrument | Current Assets | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [2] | 2 | 5
Designated as Hedging Instrument | Current Assets | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 43 | 55
Designated as Hedging Instrument | Current Assets | Commodity | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 2 | 3
Designated as Hedging Instrument | Current Assets | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  |  | 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 | Current Assets | Interest rate | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  |  | 2
Designated as Hedging Instrument | Noncurrent Assets |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [10] | 31 | 36
Designated as Hedging Instrument | Noncurrent Assets | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [4] | 14 | 26
Designated as Hedging Instrument | Noncurrent Assets | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 10 | 6
Designated as Hedging Instrument | Noncurrent Assets | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 7 | 4
Designated as Hedging Instrument | Noncurrent Assets | Foreign currency |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 14 | 26
Designated as Hedging Instrument | Noncurrent Assets | Foreign currency | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 14 | 26
Designated as Hedging Instrument | Current Liabilities |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [11] | 152 | 45
Designated as Hedging Instrument | Current Liabilities | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [5] | 104 | 10
Designated as Hedging Instrument | Current Liabilities | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [6] | 34 | 11
Designated as Hedging Instrument | Current Liabilities | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 10 | 17
Designated as Hedging Instrument | Current Liabilities | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 142 | 26
Designated as Hedging Instrument | Current Liabilities | Interest rate | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 104 | 10
Designated as Hedging Instrument | Current Liabilities | Interest rate | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 34 | 9
Designated as Hedging Instrument | Current Liabilities | Foreign currency |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  |  | 2
Designated as Hedging Instrument | Current Liabilities | Foreign currency | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  |  | 2
Designated as Hedging Instrument | Noncurrent Liabilities |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [12] | 399 | 121
Designated as Hedging Instrument | Noncurrent Liabilities | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [7] | 228 | 78
Designated as Hedging Instrument | Noncurrent Liabilities | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [8] | 43 | 8
Designated as Hedging Instrument | Noncurrent Liabilities | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 2 | 5
Designated as Hedging Instrument | Noncurrent Liabilities | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 397 | 116
Designated as Hedging Instrument | Noncurrent Liabilities | Interest rate | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 228 | 78
Designated as Hedging Instrument | Noncurrent Liabilities | Interest rate | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 43 | 8
Fair Value - Derivatives not under Hedge Accounting |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 135 | 189
Derivative Liabilities |  | 75 | 113
Fair Value - Derivatives not under Hedge Accounting | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 83 | 90
Derivative Liabilities |  | 26 | 15
Fair Value - Derivatives not under Hedge Accounting | Current Assets |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 70 | 154
Fair Value - Derivatives not under Hedge Accounting | Current Assets | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [1] | 24 | 60
Fair Value - Derivatives not under Hedge Accounting | Current Assets | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 70 | 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 |  | 65 | 35
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Assets | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [3] | 59 | 30
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Assets | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 65 | 35
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Assets | Commodity | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 59 | 30
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 49 | 112
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [5] | 20 | 15
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 48 | 112
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities | Commodity | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 20 | 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 |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 26 | 1
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Liabilities | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [7] | 6 |
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Liabilities | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 9 | $ 1
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Liabilities | Commodity | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 6 |
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Liabilities | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | $ 17 |
[1] | Current derivative assets are presented in other current assets in Virginia Power’s Consolidated Balance Sheets.
[2] | Current derivative assets include $2 million in other current assets at December 31, 2018, with the remainder recorded in current assets of discontinued operations in Dominion Energy Gas’ Consolidated Balance Sheets. All current derivative assets are included in current assets of discontinued operations of Dominion Energy Gas’ Consolidated Balance Sheets at June 30, 2019.
[3] | Noncurrent derivative assets are presented in other deferred charges and other assets in Virginia Power’s Consolidated Balance Sheets.
[4] | Noncurrent derivatives 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 Virginia Power’s Consolidated Balance Sheets.
[6] | Current derivative liabilities are presented in other current liabilities in Dominion Energy Gas’ Consolidated Balance Sheets.
[7] | Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Virginia Power’s Consolidated Balance Sheets.
[8] | Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Dominion Energy Gas’ Consolidated Balance Sheets.
[9] | Current derivative assets are presented in other current assets in Dominion Energy’s Consolidated Balance Sheets.
[10] | Noncurrent derivative assets are presented in other deferred charges and other assets in Dominion Energy’s Consolidated Balance Sheets.
[11] | Current derivative liabilities are presented in other current liabilities in Dominion Energy’s Consolidated Balance Sheets.
[12] | Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Dominion Energy’s Consolidated Balance Sheets.

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