v3.25.2
Regulatory Assets and Liabilities (Narrative) (Detail)
$ in Billions
Jun. 30, 2025
USD ($)
Public Utilities General Disclosures [Line Items]  
Regulatory assets not expect to earn return $ 6.0
Period for which expenditures are expected to be recovered 2 years
Virginia Electric and Power Company  
Public Utilities General Disclosures [Line Items]  
Regulatory assets not expect to earn return $ 4.3