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Regulatory Matters - Annual Electric Transmission Fillings (Details) - USD ($)
$ in Millions
May 30, 2023
May 12, 2023
Apr. 25, 2023
Commonwealth Edison Co [Member] | 2023 Transmission Formula Rate Annual Update [Member]      
Public Utilities, General Disclosures [Line Items]      
Public Utilities, Requested Rate Increase (Decrease), Amount   $ 20  
Annual Reconciliation Increase   63  
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount   $ 83  
Public Utilities, Approved Equity Capital Structure, Percentage   8.09%  
Public Utilities, Approved Return on Equity, Percentage   11.50%  
Cap on Equity Component of Rate of Return on Common Equity in Federal Energy Regulatory Committee Complaint   55.00%  
Basis points for Transmission Formula Rate   50  
PECO Energy Co [Member] | 2023 Transmission Formula Rate Annual Update [Member]      
Public Utilities, General Disclosures [Line Items]      
Public Utilities, Requested Rate Increase (Decrease), Amount     $ 24
Annual Reconciliation Increase     23
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount     $ 47
Public Utilities, Approved Equity Capital Structure, Percentage     7.41%
Public Utilities, Approved Return on Equity, Percentage     10.35%
Cap on Equity Component of Rate of Return on Common Equity in Federal Energy Regulatory Committee Complaint 55.75%    
Basis points for Transmission Formula Rate 50    
Baltimore Gas and Electric Company [Member] | 2023 Transmission Formula Rate Annual Update [Member]      
Public Utilities, General Disclosures [Line Items]      
Public Utilities, Requested Rate Increase (Decrease), Amount     $ 19
Annual Reconciliation Increase     (12)
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount     $ 4
Public Utilities, Approved Equity Capital Structure, Percentage     7.34%
Public Utilities, Approved Return on Equity, Percentage     10.50%
Basis points for Transmission Formula Rate     50
Baltimore Gas and Electric Company [Member] | 2023 Transmission Formula Rate Revenue Reduction      
Public Utilities, General Disclosures [Line Items]      
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount     $ 3
Potomac Electric Power Company [Member] | 2023 Transmission Formula Rate Annual Update [Member]      
Public Utilities, General Disclosures [Line Items]      
Public Utilities, Requested Rate Increase (Decrease), Amount   $ 37  
Annual Reconciliation Increase   (5)  
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount   $ 32  
Public Utilities, Approved Equity Capital Structure, Percentage   7.57%  
Public Utilities, Approved Return on Equity, Percentage   10.50%  
Basis points for Transmission Formula Rate   50  
Delmarva Power and Light Company [Member] | 2023 Transmission Formula Rate Annual Update [Member]      
Public Utilities, General Disclosures [Line Items]      
Public Utilities, Requested Rate Increase (Decrease), Amount   $ 32  
Annual Reconciliation Increase   (3)  
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount   $ 29  
Public Utilities, Approved Equity Capital Structure, Percentage   7.08%  
Public Utilities, Approved Return on Equity, Percentage   10.50%  
Basis points for Transmission Formula Rate   50  
Atlantic City Electric Company [Member] | 2023 Transmission Formula Rate Annual Update [Member]      
Public Utilities, General Disclosures [Line Items]      
Public Utilities, Requested Rate Increase (Decrease), Amount   $ 41  
Annual Reconciliation Increase   (12)  
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount   $ 29  
Public Utilities, Approved Equity Capital Structure, Percentage   7.08%  
Public Utilities, Approved Return on Equity, Percentage   10.50%  
Basis points for Transmission Formula Rate   50