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Related-Party Transactions (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Related Party Transaction [Line Items] |  |  |
Services provided to affiliates |  | $ 3,632 | $ 3,883
Virginia Electric and Power Company |  |  |
Related Party Transaction [Line Items] |  |  |
Commodity purchases from affiliates |  | 198 | 214
Services provided to affiliates | [1] | 2,489 | 2,384
Virginia Electric and Power Company | Related Party |  |  |
Related Party Transaction [Line Items] |  |  |
Services provided by affiliates | [2] | 155 | 147
Services provided to affiliates |  | $ 4 | $ 4
[1] | See Note 19 for amounts attributable to affiliates.
[2] | Includes capitalized expenditures of $53 million and $54 million for the three months ended March 31, 2024 and 2023, respectively.

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