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Related-Party Transactions (Detail) - Virginia Electric and Power Company - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Related Party Transaction [Line Items]    
Commodity purchases from affiliates $ 293 $ 181
Services provided by affiliates [1] 130 125
Affiliated Entity    
Related Party Transaction [Line Items]    
Services provided to affiliates $ 4 $ 5
[1] Includes capitalized expenditures of $39 million and $38 million for the three months ended March 31, 2022 and 2021, respectively.