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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 | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [1],[2] | $ 208 | $ (289) | $ 135 | $ (55)
Virginia Electric and Power Company |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [3],[4] | 37 | 3 | 53 | (43)
Commodity Contract | Operating Revenue |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [1],[2] | (272) | (146) | (602) | (187)
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] | (88) | (4) | (129) | (6)
Commodity Contract | Purchased Gas |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [1],[2] | 3 | 7 | 5 | 7
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] | 137 | 7 | 196 | (37)
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] | 125 | 7 | 182 | (37)
Interest Rate Contract | Interest And Related Charges |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [1],[2] | $ 340 | $ (157) | $ 536 | $ 162
[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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