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Related-Party Transactions (Parenthetical) (Detail) - Virginia Electric and Power Company - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Related Party Transaction [Line Items] |  |  |
Capital expenditures | $ 9,760 | $ 6,978 | $ 4,909
Services provided by affiliates | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Capital expenditures | $ 234 | $ 210 | $ 177

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