v3.26.1
Regulatory Matters - Narrative (Details)
$ in Millions
6 Months Ended 48 Months Ended
May 15, 2026
Dec. 19, 2024
USD ($)
Jun. 30, 2026
USD ($)
Dec. 31, 2027
Jul. 13, 2026
Aug. 06, 2025
USD ($)
Dec. 31, 2024
USD ($)
Commonwealth Edison Co              
Regulatory Matters Additional Narrative Information [Line Items]              
Maximum increase of revenue requirement     105.00%        
Commonwealth Edison Co | Carbon Mitigation Credit rider              
Regulatory Matters Additional Narrative Information [Line Items]              
Regulatory Liabilities     $ 150        
Commonwealth Edison Co | Nuclear Production Tax Credits              
Regulatory Matters Additional Narrative Information [Line Items]              
Regulatory Assets             $ 804
Commonwealth Edison Co | Illinois 2023 Electric Distribution Base Rate Case              
Regulatory Matters Additional Narrative Information [Line Items]              
Approved Revenue Requirement Increase (Decrease)   $ 1,045          
Commonwealth Edison Co | Illinois 2023 Electric Distribution Base Rate Case | 2026              
Regulatory Matters Additional Narrative Information [Line Items]              
Approved Revenue Requirement Increase (Decrease)   102          
Commonwealth Edison Co | Illinois 2023 Electric Distribution Base Rate Case | 2027              
Regulatory Matters Additional Narrative Information [Line Items]              
Approved Revenue Requirement Increase (Decrease)   $ 111          
Commonwealth Edison Co | 2026 Transmission Formula Rate Annual Update              
Regulatory Matters Additional Narrative Information [Line Items]              
Basis points for Transmission Formula Rate 0.0050            
Commonwealth Edison Co | Forecast [Member] | Illinois 2023 Electric Distribution Base Rate Case              
Regulatory Matters Additional Narrative Information [Line Items]              
Public Utilities, Approved Debt Capital Structure, Percentage       50.00%      
Baltimore Gas and Electric Company | Legislative Energy Relief Refund              
Regulatory Matters Additional Narrative Information [Line Items]              
Regulatory Liabilities           $ 49  
Baltimore Gas and Electric Company | 2026 Transmission Formula Rate Annual Update              
Regulatory Matters Additional Narrative Information [Line Items]              
Basis points for Transmission Formula Rate 0.0050            
Potomac Electric Power Company | Legislative Energy Relief Refund              
Regulatory Matters Additional Narrative Information [Line Items]              
Regulatory Liabilities           21  
Potomac Electric Power Company | 2026 Transmission Formula Rate Annual Update              
Regulatory Matters Additional Narrative Information [Line Items]              
Basis points for Transmission Formula Rate 0.0050            
Delmarva Power and Light Company              
Regulatory Matters Additional Narrative Information [Line Items]              
Non-mandatory Capital Spend         70    
Percentage of proposed rates to be implemented 7 months after filing         50.00%    
Percentage of proposed rates to be implemented 12 months after filing         75.00%    
Non-mandatory capital spend eligible to be recovered in rates after 2028         5.00%    
Delmarva Power and Light Company | Legislative Energy Relief Refund              
Regulatory Matters Additional Narrative Information [Line Items]              
Regulatory Liabilities           $ 8  
Delmarva Power and Light Company | 2026 Transmission Formula Rate Annual Update              
Regulatory Matters Additional Narrative Information [Line Items]              
Basis points for Transmission Formula Rate 0.0050            
Atlantic City Electric Company | 2026 Transmission Formula Rate Annual Update              
Regulatory Matters Additional Narrative Information [Line Items]              
Basis points for Transmission Formula Rate 0.0050