v3.26.3
Derivatives and Hedge Accounting Activities (Volume of Derivative Activity) (Detail) - 9 months ended Sep. 30, 2026
USD ($)
MWh
Bcf
DKK (kr)
EUR (€)
Fixed Price - Natural Gas - Current Derivative Contract      
Derivative [Line Items]      
Volume of derivative activity 25    
Fixed Price - Natural Gas - Current Derivative Contract | Virginia Electric and Power Company      
Derivative [Line Items]      
Volume of derivative activity 23    
Basis - Natural Gas - Current Derivative Contract      
Derivative [Line Items]      
Volume of derivative activity [1] 319    
Basis - Natural Gas - Current Derivative Contract | Virginia Electric and Power Company      
Derivative [Line Items]      
Volume of derivative activity [1] 174    
Fixed Price - Electricity - Current Derivative Contract      
Derivative [Line Items]      
Volume of electricity | MWh 9    
Financial Transmission Rights - Electricity- Current Derivative Contract      
Derivative [Line Items]      
Volume of electricity | MWh 61    
Financial Transmission Rights - Electricity- Current Derivative Contract | Virginia Electric and Power Company      
Derivative [Line Items]      
Volume of electricity | MWh 61    
Interest Rate - Current Derivative Contract      
Derivative [Line Items]      
Derivative payment | $ [2] $ 0    
Interest Rate - Current Derivative Contract | Virginia Electric and Power Company      
Derivative [Line Items]      
Derivative payment | $ [2] $ 0    
Foreign Currency Exchange Rate - Current Derivative Contract      
Derivative [Line Items]      
Derivative payment [2]   kr 229,000,000 € 98,000,000
Foreign Currency Exchange Rate - Current Derivative Contract | Virginia Electric and Power Company      
Derivative [Line Items]      
Derivative payment [2]   229,000,000 98,000,000
Basis - Natural Gas - Non-current Derivative Contract      
Derivative [Line Items]      
Volume of derivative activity [1] 1,896    
Basis - Natural Gas - Non-current Derivative Contract | Virginia Electric and Power Company      
Derivative [Line Items]      
Volume of derivative activity [1] 297    
Fixed Price - Electricity - Non-current Derivative Contract      
Derivative [Line Items]      
Volume of electricity | MWh 34    
Interest Rate - Non-current Derivative Contract      
Derivative [Line Items]      
Derivative payment | $ [2] $ 8,471,000,000    
Interest Rate - Non-current Derivative Contract | Virginia Electric and Power Company      
Derivative [Line Items]      
Derivative payment | $ [2] $ 7,400,000,000    
Foreign Currency Exchange Rate - Non-current Derivative Contract      
Derivative [Line Items]      
Derivative payment [2]   0 0
Foreign Currency Exchange Rate - Non-current Derivative Contract | Virginia Electric and Power Company      
Derivative [Line Items]      
Derivative payment [2]   kr 0 € 0
[1] Includes options.
[2] Maturity is determined based on final settlement period.