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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
3 Months Ended
Mar. 31, 2024
USD ($)
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ (202)
Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax (31)
Virginia Electric and Power Company  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax 22
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 (202)
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (31)
Maximum Term 381 months
Interest Rate Contract | Virginia Electric and Power Company  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ 22
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ 0
Maximum Term 381 months