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Related-Party Transactions (Parenthetical) (Detail) - Virginia Electric and Power Company - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Related Party Transaction [Line Items] |  |  |  |
Capital expenditures |  |  | $ 5,103 | $ 4,489
Services provided by affiliates | Affiliated Entity |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Capital expenditures | $ 71 | $ 58 | $ 146 | $ 111

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