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Derivatives and Hedge Accounting Activities (Selected Information Related to Losses on Cash Flow Hedges Included in AOCI) (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2022
USD ($)
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ (249)
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 16
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 (249)
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (33)
Maximum Term 396 months
Interest Rate Contract | Virginia Electric and Power Company  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ 16
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (1)
Maximum Term 396 months