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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
6 Months Ended
Jun. 30, 2023
USD ($)
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ (236)
Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax (33)
Virginia Electric and Power Company  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax 13
Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax 0
Interest Rate Contract  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax (236)
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (33)
Maximum Term 390 months
Interest Rate Contract | Virginia Electric and Power Company  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ 13
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ 0
Maximum Term 390 months