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Related-Party Transactions (Parenthetical) (Detail) - Virginia Electric and Power Company - 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] |  |  |  |
Capital expenditures |  |  | $ 6,885 | $ 4,871
Services provided by affiliates | Affiliated Entity |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Capital expenditures | $ 59 | $ 51 | $ 170 | $ 151

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