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Derivatives and Hedge Accounting Activities (Fair Value of Derivatives) (Detail) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | $ 93 | $ 294
Derivative Liabilities |  | 934 | 279
Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 20 | 93
Derivative Liabilities |  | 554 | 103
Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 5 | 29
Derivative Liabilities |  | 117 | 19
Current Assets |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [1] | 73 | 223
Current Assets | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [2] | 19 | 63
Current Assets | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [3] | 2 | 3
Current Assets | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 71 | 209
Current Assets | Commodity | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 19 | 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 |  | 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] | 20 | 71
Noncurrent Assets | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [5] | 1 | 30
Noncurrent Assets | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [6] | 3 | 26
Noncurrent Assets | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 9 | 41
Noncurrent Assets | Commodity | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 1 | 30
Noncurrent Assets | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 8 | 4
Noncurrent Assets | Foreign currency |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 3 | 26
Noncurrent Assets | Foreign currency | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 3 | 26
Current Liabilities |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [7] | 265 | 157
Current Liabilities | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 165 | 25
Current Liabilities | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [8] | 51 | 11
Current Liabilities | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 59 | 129
Current Liabilities | Commodity | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 16 | 15
Current Liabilities | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 202 | 26
Current Liabilities | Interest rate | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 149 | 10
Current Liabilities | Interest rate | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 47 | 9
Current Liabilities | Foreign currency |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 4 | 2
Current Liabilities | Foreign currency | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 4 | 2
Noncurrent Liabilities |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [9] | 669 | 122
Noncurrent Liabilities | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [10] | 389 | 78
Noncurrent Liabilities | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [11] | 66 | 8
Noncurrent Liabilities | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 21 | 6
Noncurrent Liabilities | Commodity | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 17 |
Noncurrent Liabilities | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 648 | 116
Noncurrent Liabilities | Interest rate | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 372 | 78
Noncurrent Liabilities | Interest rate | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 66 | 8
Designated as Hedging Instrument |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 33 | 105
Derivative Liabilities |  | 842 | 166
Designated as Hedging Instrument | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  |  | 3
Derivative Liabilities |  | 521 | 88
Designated as Hedging Instrument | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 5 | 29
Derivative Liabilities |  | 117 | 19
Designated as Hedging Instrument | Current Assets |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [1] | 20 | 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] | 2 | 3
Designated as Hedging Instrument | Current Assets | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 18 | 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 |  | 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] | 13 | 36
Designated as Hedging Instrument | Noncurrent Assets | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [6] | 3 | 26
Designated as Hedging Instrument | Noncurrent Assets | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 2 | 6
Designated as Hedging Instrument | Noncurrent Assets | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 8 | 4
Designated as Hedging Instrument | Noncurrent Assets | Foreign currency |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 3 | 26
Designated as Hedging Instrument | Noncurrent Assets | Foreign currency | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 3 | 26
Designated as Hedging Instrument | Current Liabilities |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [7] | 213 | 45
Designated as Hedging Instrument | Current Liabilities | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 149 | 10
Designated as Hedging Instrument | Current Liabilities | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [8] | 51 | 11
Designated as Hedging Instrument | Current Liabilities | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 9 | 17
Designated as Hedging Instrument | Current Liabilities | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 200 | 26
Designated as Hedging Instrument | Current Liabilities | Interest rate | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 149 | 10
Designated as Hedging Instrument | Current Liabilities | Interest rate | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 47 | 9
Designated as Hedging Instrument | Current Liabilities | Foreign currency |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 4 | 2
Designated as Hedging Instrument | Current Liabilities | Foreign currency | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 4 | 2
Designated as Hedging Instrument | Noncurrent Liabilities |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [9] | 629 | 121
Designated as Hedging Instrument | Noncurrent Liabilities | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [10] | 372 | 78
Designated as Hedging Instrument | Noncurrent Liabilities | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [11] | 66 | 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 |  | 627 | 116
Designated as Hedging Instrument | Noncurrent Liabilities | Interest rate | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 372 | 78
Designated as Hedging Instrument | Noncurrent Liabilities | Interest rate | Dominion Energy Gas Holdings, LLC |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 66 | 8
Fair Value - Derivatives not under Hedge Accounting |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 60 | 189
Derivative Liabilities |  | 92 | 113
Fair Value - Derivatives not under Hedge Accounting | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 20 | 90
Derivative Liabilities |  | 33 | 15
Fair Value - Derivatives not under Hedge Accounting | Current Assets |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [1] | 53 | 154
Fair Value - Derivatives not under Hedge Accounting | Current Assets | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [2] | 19 | 60
Fair Value - Derivatives not under Hedge Accounting | Current Assets | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 53 | 154
Fair Value - Derivatives not under Hedge Accounting | Current Assets | Commodity | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 19 | 60
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Assets |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [4] | 7 | 35
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Assets | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset | [5] | 1 | 30
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Assets | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 7 | 35
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Assets | Commodity | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset |  | 1 | 30
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [7] | 52 | 112
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 16 | 15
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 50 | 112
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities | Commodity | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 16 | 15
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 2 |
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Liabilities |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [9] | 40 | 1
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Liabilities | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities | [10] | 17 |
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Liabilities | Commodity |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 19 | $ 1
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Liabilities | Commodity | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | 17 |
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Liabilities | Interest rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Liabilities |  | $ 21 |
[1] | Current derivative assets include amounts presented in assets held for sale 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 include $242 million and $157 million in other current liabilities at September 30, 2019 and December 31. 2018, respectively, with the remainder recorded in liabilities held for sale in Dominion Energy’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.
[11] | Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Dominion Energy Gas’ Consolidated Balance Sheets.

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