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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, 2023 | Mar. 31, 2022
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [1],[2] | $ 342 | $ (73)
Virginia Electric and Power Company |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [1],[2] | (37) | 16
Commodity Contract | Operating Revenue |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [1],[2] | 395 | (330)
Commodity Contract | Operating Revenue | Virginia Electric and Power Company |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [1],[2] | 9 | (41)
Commodity Contract | Purchased Gas |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [1],[2] | 94 | 2
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] | (45) | 59
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 | [1],[2] | (46) | 57
Interest Rate Contract | Interest And Related Charges |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [1],[2] | $ (102) | $ 196
[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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