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Regulatory Matters - Schedule of Pending Rate Cases (Details) - USD ($)
$ in Millions
Oct. 07, 2022
May 19, 2022
Apr. 15, 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
Delmarva Power and Light Company [Member] | Maryland 2022 Electric Distribution Base Rate Case      
Regulatory Matters Pending Rate Cases [Line Items]      
Requested Revenue Requirement Increase (Decrease) $ 29 $ 38  
Requested Return on Equity, Percentage 9.60% 10.25%  
Delmarva Power and Light Company [Member] | Maryland 2022 Electric Distribution Base Rate Case | 2023      
Regulatory Matters Pending Rate Cases [Line Items]      
Public Utilities, Requested Rate Increase (Decrease), Initial Revenue Requirement, Amount $ 17 $ 23  
Public Utilities, Requested Rate Increase (Decrease), Tax Benefits   (12)  
Delmarva Power and Light Company [Member] | Maryland 2022 Electric Distribution Base Rate Case | 2024      
Regulatory Matters Pending Rate Cases [Line Items]      
Public Utilities, Requested Rate Increase (Decrease), Initial Revenue Requirement, Amount 6 8  
Public Utilities, Requested Rate Increase (Decrease), Tax Benefits   (8)  
Delmarva Power and Light Company [Member] | Maryland 2022 Electric Distribution Base Rate Case | 2025      
Regulatory Matters Pending Rate Cases [Line Items]      
Public Utilities, Requested Rate Increase (Decrease), Initial Revenue Requirement, Amount $ 6 $ 7