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Derivatives and Hedge Accounting Activities (Schedule of Derivatives not Designated as Hedging Instruments) (Detail) - Derivatives Not Designated as Hedging Instruments - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [1] | $ (75) | $ (3)
Virginia Electric and Power Company |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [2] | (65) | (9)
Dominion Energy Gas Holdings, LLC |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [3] | (8) |
Commodity | Virginia Electric and Power Company |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [2],[4] | (65) | (9)
Commodity | Operating Revenue |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [1] | 65 | 3
Commodity | Purchased Gas |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [1] | (14) | 3
Commodity | Electric Fuel and Other Energy-Related Purchases |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [1] | (65) | $ (9)
Interest rate |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [1],[5] | (61) |
Interest rate | Dominion Energy Gas Holdings, LLC |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [3] | $ (8) |
[1] | Includes derivative activity amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in Dominion Energy’s Consolidated Statements of Income.
[2] | Includes derivative activity amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in Virginia Power’s Consolidated Statements of Income.
[3] | Amounts recorded in Dominion Energy Gas’ Consolidated Statements of Income are classified in interest and related charges
[4] | Amounts recorded in Virginia Power’s Consolidated Statements of Income are classified in electric fuel and other energy-related purchases.
[5] | Amounts recorded in Dominion Energy’s Consolidated Statements of Income are classified in interest and related charges.

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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