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Related-Party Transactions (Detail) - Virginia Electric and Power Company - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Related Party Transaction [Line Items]      
Commodity purchases from affiliates $ 742 $ 569 $ 690
Services provided by affiliates [1] 494 455 503
Affiliated Entity      
Related Party Transaction [Line Items]      
Services provided to affiliates $ 18 $ 18 $ 24
[1] Includes capitalized expenditures of $161 million, $141 million and $133 million for the year ended December 31, 2021, 2020 and 2019, respectively.