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Derivatives and Hedge Accounting Activities (Volume of Derivative Activity) (Detail) - 9 months ended Sep. 30, 2023
€ in Millions, kr in Millions, $ in Millions
USD ($)
MWh
Bcf
DKK (kr)
EUR (€)
Fixed Price - Natural Gas - Current Derivative Contract      
Derivative [Line Items]      
Volume of electricity | MWh [1] 45    
Fixed Price - Natural Gas - Current Derivative Contract | Virginia Electric and Power Company      
Derivative [Line Items]      
Volume of electricity | MWh [1] 35    
Basis - Natural Gas - Current Derivative Contract      
Derivative [Line Items]      
Volume of derivative activity | Bcf [2] 179    
Basis - Natural Gas - Current Derivative Contract | Virginia Electric and Power Company      
Derivative [Line Items]      
Volume of derivative activity | Bcf [2] 149    
Fixed Price - Electricity - Current Derivative Contract      
Derivative [Line Items]      
Volume of derivative activity | Bcf 17    
Fixed Price - Electricity - Current Derivative Contract | Virginia Electric and Power Company      
Derivative [Line Items]      
Volume of derivative activity | Bcf 8    
Financial Transmission Rights - Electricity- Current Derivative Contract      
Derivative [Line Items]      
Volume of electricity | MWh 62    
Financial Transmission Rights - Electricity- Current Derivative Contract | Virginia Electric and Power Company      
Derivative [Line Items]      
Volume of electricity | MWh 62    
Interest Rate - Current Derivative Contract      
Derivative [Line Items]      
Derivative payment | $ [3] $ 300    
Interest Rate - Current Derivative Contract | Virginia Electric and Power Company      
Derivative [Line Items]      
Derivative payment | $ [3] $ 0    
Foreign Currency Exchange Rate - Current Derivative Contract      
Derivative [Line Items]      
Derivative payment [3]   kr 895 € 806
Foreign Currency Exchange Rate - Current Derivative Contract | Virginia Electric and Power Company      
Derivative [Line Items]      
Derivative payment [3]   895 806
Fixed Price - Natural Gas - Non-current Derivative Contract      
Derivative [Line Items]      
Volume of electricity | MWh [1] 20    
Fixed Price - Natural Gas - Non-current Derivative Contract | Virginia Electric and Power Company      
Derivative [Line Items]      
Volume of electricity | MWh [1] 20    
Basis - Natural Gas - Non-current Derivative Contract      
Derivative [Line Items]      
Volume of derivative activity | Bcf [2] 369    
Basis - Natural Gas - Non-current Derivative Contract | Virginia Electric and Power Company      
Derivative [Line Items]      
Volume of derivative activity | Bcf [2] 369    
Fixed Price - Electricity - Non-current Derivative Contract      
Derivative [Line Items]      
Volume of derivative activity | Bcf 41    
Fixed Price - Electricity - Non-current Derivative Contract | Virginia Electric and Power Company      
Derivative [Line Items]      
Volume of derivative activity | Bcf 11    
Financial Transmission Rights - Electricity- Non-current Derivative Contract      
Derivative [Line Items]      
Volume of electricity | MWh 0    
Financial Transmission Rights - Electricity- Non-current Derivative Contract | Virginia Electric and Power Company      
Derivative [Line Items]      
Volume of electricity | MWh 0    
Interest Rate - Non-current Derivative Contract      
Derivative [Line Items]      
Derivative payment | $ [3] $ 10,121    
Interest Rate - Non-current Derivative Contract | Virginia Electric and Power Company      
Derivative [Line Items]      
Derivative payment | $ [3] $ 2,750    
Foreign Currency Exchange Rate - Non-current Derivative Contract      
Derivative [Line Items]      
Derivative payment [3]   3,278 1,557
Foreign Currency Exchange Rate - Non-current Derivative Contract | Virginia Electric and Power Company      
Derivative [Line Items]      
Derivative payment [3]   kr 3,278 € 1,557
[1] Includes options at Dominion Energy.
[2] Includes options.
[3] Maturity is determined based on final settlement period.