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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Related Party Transaction [Line Items] |  |  |
Capital expenditures | $ 4,909 | $ 3,521 | $ 3,138
Services provided by affiliates | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Capital expenditures | $ 177 | $ 161 | $ 141

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