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Regulatory Matters - Schedule of Pending Rate Cases (Details) - USD ($)
$ in Millions
Apr. 15, 2022
Mar. 31, 2022
Feb. 28, 2022
Commonwealth Edison Co [Member] | Illinois 2022 Electric Distribution Base Rate Case      
Regulatory Matters Pending Rate Cases [Line Items]      
Requested Revenue Requirement Increase (Decrease) $ 199    
Commonwealth Edison Co [Member] | Illinois 2022 Electric Distribution Base Rate Case | 2023      
Regulatory Matters Pending Rate Cases [Line Items]      
Requested Return on Equity, Percentage 7.85%    
Public Utilities, Requested Rate Increase (Decrease), Initial Revenue Requirement, Amount $ 144    
Requested Return on Distribution Rate Base, Percentage 5.94%    
Basis points for ComEd's Revenue Requirement 580    
Commonwealth Edison Co [Member] | Illinois 2022 Electric Distribution Base Rate Case | 2021      
Regulatory Matters Pending Rate Cases [Line Items]      
Requested Return on Equity, Percentage 7.78%    
Public Utilities Requested Rate Increase (Decrease), Prior Year Annual Reconciliation $ 55    
Requested Return on Distribution Rate Base, Percentage 5.91%    
Basis points for ComEd's Revenue Requirement 580    
Commonwealth Edison Co [Member] | Illinois 2022 Electric Distribution Base Rate Case | Performance Metrics Penalty | 2021      
Regulatory Matters Pending Rate Cases [Line Items]      
Basis points for ComEd's Revenue Requirement 7    
PECO Energy Co [Member] | Pennsylvania 2022 Natural Gas Distribution Base Rate Case      
Regulatory Matters Pending Rate Cases [Line Items]      
Requested Revenue Requirement Increase (Decrease)   $ 82  
Requested Return on Equity, Percentage   10.95%  
Delmarva Power and Light Company [Member] | Delaware 2022 Natural Gas Distribution Base Rate Case      
Regulatory Matters Pending Rate Cases [Line Items]      
Requested Revenue Requirement Increase (Decrease)     $ 15
Requested Return on Equity, Percentage     10.30%