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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 | 9 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [1],[2] | $ (8) | $ (285) | $ 127 | $ (340)
Virginia Electric and Power Company |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [3],[4] | 58 | 23 | 111 | (20)
Commodity Contract | Operating Revenue |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [1],[2] | (306) | (334) | (908) | (521)
Commodity Contract | Operating Revenue | Virginia Electric and Power Company |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [3],[4] | (108) | (19) | (237) | (25)
Commodity Contract | Purchased Gas |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [1],[2] | 1 | 25 | 6 | 32
Commodity Contract | Electric Fuel and Other Energy-Related Purchases |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [1],[2] | 205 | 44 | 401 | 7
Commodity Contract | Electric Fuel and Other Energy-Related Purchases | Virginia Electric and Power Company |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [3],[4] | 166 | 42 | 348 | 5
Interest Rate Contract | Interest And Related Charges |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [1],[2] | $ 92 | $ (20) | $ 628 | $ 142
[1] | Excludes amounts related to foreign currency exchange rate derivatives that are deferred to plant under construction within property, plant and equipment and regulatory assets/liabilities that will begin to amortize once the CVOW Commercial Project is placed in service
[2] | 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
[3] | Excludes amounts related to foreign currency exchange rate derivatives that are deferred to plant under construction within property, plant and equipment and regulatory assets/liabilities that will begin to amortize once the CVOW Commercial Project is placed in service.
[4] | 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.

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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 https://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 + Details
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