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Regulatory Matters - Annual Electric Transmission Filings (Details) - USD ($)
$ in Millions
May 27, 2022
May 13, 2022
Apr. 29, 2022
Apr. 27, 2022
Commonwealth Edison Co [Member] | 2022 Transmission Formula Rate Annual Update [Domain]        
Public Utilities, General Disclosures [Line Items]        
Public Utilities, Requested Rate Increase (Decrease), Amount     $ 24  
Annual Reconciliation Increase (Decrease)     (24)  
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount     $ 0  
Public Utilities, Approved Equity Capital Structure, Percentage     8.11%  
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] | 2022 Transmission Formula Rate Annual Update [Domain]        
Public Utilities, General Disclosures [Line Items]        
Public Utilities, Requested Rate Increase (Decrease), Amount $ 23      
Annual Reconciliation Increase (Decrease) 16      
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount $ 39      
Public Utilities, Approved Equity Capital Structure, Percentage 7.30%      
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] | 2022 Transmission Formula Rate Annual Update [Domain]        
Public Utilities, General Disclosures [Line Items]        
Public Utilities, Requested Rate Increase (Decrease), Amount       $ 25
Annual Reconciliation Increase (Decrease)       (4)
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount       $ 16
Public Utilities, Approved Equity Capital Structure, Percentage       7.30%
Public Utilities, Approved Return on Equity, Percentage       10.50%
Basis points for Transmission Formula Rate       50
Baltimore Gas and Electric Company [Member] | 2022 Transmission Formula Rate Revenue Reduction        
Public Utilities, General Disclosures [Line Items]        
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount       $ 5
Potomac Electric Power Company [Member] | 2022 Transmission Formula Rate Annual Update [Domain]        
Public Utilities, General Disclosures [Line Items]        
Public Utilities, Requested Rate Increase (Decrease), Amount   $ 16    
Annual Reconciliation Increase (Decrease)   15    
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount   $ 31    
Public Utilities, Approved Equity Capital Structure, Percentage   7.60%    
Public Utilities, Approved Return on Equity, Percentage   10.50%    
Basis points for Transmission Formula Rate   50    
Delmarva Power & Light Company [Member] | 2022 Transmission Formula Rate Annual Update [Domain]        
Public Utilities, General Disclosures [Line Items]        
Public Utilities, Requested Rate Increase (Decrease), Amount   $ 9    
Annual Reconciliation Increase (Decrease)   2    
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount   $ 11    
Public Utilities, Approved Equity Capital Structure, Percentage   7.09%    
Public Utilities, Approved Return on Equity, Percentage   10.50%    
Basis points for Transmission Formula Rate   50    
Atlantic City Electric Company [Member] | 2022 Transmission Formula Rate Annual Update [Domain]        
Public Utilities, General Disclosures [Line Items]        
Public Utilities, Requested Rate Increase (Decrease), Amount   $ 21    
Annual Reconciliation Increase (Decrease)   13    
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount   $ 34    
Public Utilities, Approved Equity Capital Structure, Percentage   7.18%    
Public Utilities, Approved Return on Equity, Percentage   10.50%    
Basis points for Transmission Formula Rate   50