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Regulatory Matters - Annual Electric Transmission Fillings (Details) - USD ($)
$ in Millions
May 30, 2024
May 10, 2024
Apr. 24, 2024
Commonwealth Edison Co | 2024 Transmission Formula Rate Annual Update      
Public Utilities, General Disclosures [Line Items]      
Public Utilities, Requested Rate Increase (Decrease), Amount     $ 32
Annual Reconciliation Increase     (12)
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount     $ 20
Public Utilities, Approved Equity Capital Structure, Percentage     8.14%
Public Utilities, Approved Return on Equity, Percentage     11.50%
Basis points for Transmission Formula Rate     50
PECO Energy Co | 2024 Transmission Formula Rate Annual Update      
Public Utilities, General Disclosures [Line Items]      
Public Utilities, Requested Rate Increase (Decrease), Amount $ 2    
Annual Reconciliation Increase 3    
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount $ 5    
Public Utilities, Approved Equity Capital Structure, Percentage 7.45%    
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 | 2024 Transmission Formula Rate Annual Update      
Public Utilities, General Disclosures [Line Items]      
Public Utilities, Requested Rate Increase (Decrease), Amount     $ 42
Annual Reconciliation Increase     13
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount     $ 53
Public Utilities, Approved Equity Capital Structure, Percentage     7.47%
Public Utilities, Approved Return on Equity, Percentage     10.50%
Basis points for Transmission Formula Rate     50
Baltimore Gas and Electric Company | 2024 Transmission Formula Rate Revenue Reduction      
Public Utilities, General Disclosures [Line Items]      
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount     $ 2
Potomac Electric Power Company | 2024 Transmission Formula Rate Annual Update      
Public Utilities, General Disclosures [Line Items]      
Public Utilities, Requested Rate Increase (Decrease), Amount   $ 58  
Annual Reconciliation Increase   15  
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount   $ 73  
Public Utilities, Approved Equity Capital Structure, Percentage   7.62%  
Public Utilities, Approved Return on Equity, Percentage   10.50%  
Basis points for Transmission Formula Rate   50  
Delmarva Power and Light Company | 2024 Transmission Formula Rate Annual Update      
Public Utilities, General Disclosures [Line Items]      
Public Utilities, Requested Rate Increase (Decrease), Amount   $ 7  
Annual Reconciliation Increase   17  
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount   $ 24  
Public Utilities, Approved Equity Capital Structure, Percentage   7.23%  
Public Utilities, Approved Return on Equity, Percentage   10.50%  
Basis points for Transmission Formula Rate   50  
Atlantic City Electric Company | 2024 Transmission Formula Rate Annual Update      
Public Utilities, General Disclosures [Line Items]      
Public Utilities, Requested Rate Increase (Decrease), Amount   $ 14  
Annual Reconciliation Increase   18  
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount   $ 32  
Public Utilities, Approved Equity Capital Structure, Percentage   7.11%  
Public Utilities, Approved Return on Equity, Percentage   10.50%  
Basis points for Transmission Formula Rate   50