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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, 2025 | Mar. 31, 2024
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [1],[2] | $ (70) | $ (174)
Virginia Electric and Power Company |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [1],[2] | (46) | (105)
Commodity | Operating Revenue |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [1],[2] | (39) | 76
Commodity | Operating Revenue | Virginia Electric and Power Company |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [1],[2] | (10) | 41
Commodity | Electric Fuel and Other Energy-Related Purchases |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [1],[2] | (34) | (148)
Commodity | 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 | [1],[2] | (36) | (146)
Commodity | Discontinued operations |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [1],[2] | 0 | (24)
Interest Rate Contract | Interest And Related Charges |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [1],[2] | $ 3 | $ (78)
[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 the Companies’ Consolidated Statements of Income.

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4E + Details
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