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Related-Party Transactions (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Related Party Transaction [Line Items] |  |  |  |  |
Services provided to affiliates |  | $ 3,941 | $ 3,810 | $ 11,059 | $ 10,859
Virginia Electric and Power Company |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Services provided to affiliates | [1] | 2,762 | 2,645 | 7,788 | 7,281
Virginia Electric and Power Company | Affiliated Entity |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Commodity purchases from affiliates |  | 147 | 146 | 453 | 463
Virginia Electric and Power Company | Related Party |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Services provided by affiliates | [2] | 169 | 149 | 495 | 441
Services provided to affiliates |  | $ 4 | $ 7 | $ 12 | $ 15
[1] | See Note 19 for amounts attributable to affiliates.
[2] | Includes capitalized expenditures of $59 million and $51 million for the three months ended September 30, 2024 and 2023, respectively and $170 million and $151 million for the nine months ended September 30, 2024 and 2023, respectively.

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