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Derivative Financial Instruments - Narrative (Details)
MWh in Millions, $ in Millions
1 Months Ended
Jun. 30, 2012
MWh
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Derivative [Line Items]      
Other   $ 1,588 $ 766
Fair Value, Recurring [Member]      
Derivative [Line Items]      
Derivative Asset   15  
Commonwealth Edison Co [Member]      
Derivative [Line Items]      
Long-term Purchase Commitment, Minimum Energy Volume Required | MWh 1.3    
Other   253 133
Commonwealth Edison Co [Member] | Fair Value, Recurring [Member]      
Derivative [Line Items]      
Derivative Asset   15 0
PECO Energy Co [Member]      
Derivative [Line Items]      
Other   47 35
Incremental Collateral For Loss Of Investment Grade Credit Rating   37  
PECO Energy Co [Member] | Fair Value, Recurring [Member]      
Derivative [Line Items]      
Derivative Asset   0  
Baltimore Gas and Electric Company [Member]      
Derivative [Line Items]      
Other   224 48
Incremental Collateral For Loss Of Investment Grade Credit Rating   75  
Baltimore Gas and Electric Company [Member] | Fair Value, Recurring [Member]      
Derivative [Line Items]      
Derivative Asset   0  
Delmarva Power and Light Company [Member]      
Derivative [Line Items]      
Other   239 59
Incremental Collateral For Loss Of Investment Grade Credit Rating   15  
Atlantic City Electric Company [Member]      
Derivative [Line Items]      
Other   149 12
Pepco Holdings LLC [Member]      
Derivative [Line Items]      
Other   580 171
Potomac Electric Power Company [Member]      
Derivative [Line Items]      
Other   149 55
Commodity Contract [Member] | External Counterparties | Collateral [Member]      
Derivative [Line Items]      
Other   781  
Commodity Contract [Member] | Commonwealth Edison Co [Member] | External Counterparties | Collateral [Member]      
Derivative [Line Items]      
Other   133 41
Commodity Contract [Member] | Baltimore Gas and Electric Company [Member] | External Counterparties | Collateral [Member]      
Derivative [Line Items]      
Other   194  
Commodity Contract [Member] | Delmarva Power and Light Company [Member] | External Counterparties | Collateral [Member]      
Derivative [Line Items]      
Other   224 $ 43
Commodity Contract [Member] | Atlantic City Electric Company [Member] | External Counterparties | Collateral [Member]      
Derivative [Line Items]      
Other   141  
Commodity Contract [Member] | Pepco Holdings LLC [Member] | External Counterparties | Collateral [Member]      
Derivative [Line Items]      
Other   452  
Commodity Contract [Member] | Potomac Electric Power Company [Member] | External Counterparties | Collateral [Member]      
Derivative [Line Items]      
Other   $ 87