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Related-Party Transactions (Detail) - Virginia Electric and Power Company - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Related Party Transaction [Line Items] |  |  |  |  |
Commodity purchases from affiliates |  | $ 291 | $ 126 | $ 584 | $ 307
Services provided by affiliates | [1] | 123 | 122 | 253 | 247
Affiliated Entity |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Services provided to affiliates |  | $ 5 | $ 4 | $ 9 | $ 9
[1] | Includes capitalized expenditures of $39 million and $44 million for the three months ended June 30, 2022 and 2021, respectively, and $78 million and $82 million for the six months ended June 30, 2022 and 2021, respectively.

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