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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 | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [1],[2] | $ 456 | $ (375) | $ 42
Virginia Electric and Power Company |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [1],[2] | 150 | (53) | (104)
Commodity | Operating Revenue |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [1],[2] | (729) | (487) | 73
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] | (303) | (62) | (104)
Commodity | Purchased Gas |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [1],[2] | 13 | (1) | (20)
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] | 514 | 16 | (104)
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] | 453 | 9 | 0
Commodity | Discontinued operations |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [1],[2] | 8 | 0 | (11)
Interest rate | Discontinued operations |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [1],[2] | 244 | 8 | 5
Interest rate | Interest and Related Charges |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [1],[2] | 406 | 89 | 87
Foreign currency exchange rate | Discontinued operations |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | [1],[2] | $ 0 | $ 0 | $ 12
[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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