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Derivatives and Hedge Accounting Activities (Selected Information Related to Gains and Losses on Cash Flow Hedges Included in AOCI) (Detail)
$ in Millions
9 Months Ended
Sep. 30, 2024
USD ($)
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ (190)
Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax (30)
Virginia Electric and Power Company  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax 17
Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax 1
Interest Rate Contract  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax (190)
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (30)
Maximum Term 375 months
Interest Rate Contract | Virginia Electric and Power Company  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ 17
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ 1
Maximum Term 375 months