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Related-Party Transactions (Parenthetical) (Detail) - Virginia Electric and Power Company - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Related Party Transaction [Line Items] |  |
Capital expenditures | $ 2,669 | $ 2,058
Services provided by affiliates | Affiliated Entity |  |
Related Party Transaction [Line Items] |  |
Capital expenditures | $ 75 | $ 53

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