XML 131 R109.htm IDEA: XBRL DOCUMENT v3.24.0.1
Derivatives and Hedge Accounting Activities (Selected Information Related to Gains (Losses) on Cash Flow Hedges Included in AOCI) (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ (216)
Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax (32)
Virginia Electric and Power Company  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax 15
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 (216)
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (32)
Maximum Term 384 months
Interest Rate Contract | Virginia Electric and Power Company  
Derivative Instruments Gain Loss [Line Items]  
AOCI After-Tax $ 15
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (0)
Maximum Term 384 months