v3.26.1
Debt and Credit Agreements (All Registrants) - Narrative (Details) - USD ($)
$ in Millions
 6 Months Ended
Mar. 31, 2026
Jun. 30, 2026
Mar. 25, 2026
ShortTermDebt4Amend03252026      
Short-term Debt [Line Items]      
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) [Member]    
ShortTermDebt3Amend03252026      
Short-term Debt [Line Items]      
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) [Member]    
Corporate, Non-Segment | ShortTermDebt4Amend03252026      
Short-term Debt [Line Items]      
Short-term bank loans and notes payable     $ 350.0
Corporate, Non-Segment | ShortTermDebt3Amend03252026      
Short-term Debt [Line Items]      
Short-term bank loans and notes payable     $ 150.0
Delmarva Power and Light Company | FMB360DueJan2031 | First Mortgage      
Short-term Debt [Line Items]      
Amount   $ 78.4  
Interest Rate   3.60%  
Revolving Credit Facility | Corporate, Non-Segment      
Short-term Debt [Line Items]      
Line of credit facility, maximum amount outstanding during period   $ 0.0  
Line of credit facility, maximum borrowing capacity   900.0  
Revolving Credit Facility | Commonwealth Edison Co      
Short-term Debt [Line Items]      
Line of credit facility, maximum amount outstanding during period   0.0  
Line of credit facility, maximum borrowing capacity   1,000.0  
Revolving Credit Facility | PECO Energy Co      
Short-term Debt [Line Items]      
Line of credit facility, maximum amount outstanding during period   0.0  
Line of credit facility, maximum borrowing capacity   600.0  
Revolving Credit Facility | Baltimore Gas and Electric Company      
Short-term Debt [Line Items]      
Line of credit facility, maximum amount outstanding during period   0.0  
Line of credit facility, maximum borrowing capacity   600.0  
Revolving Credit Facility | Potomac Electric Power Company      
Short-term Debt [Line Items]      
Line of credit facility, maximum amount outstanding during period   0.0  
Line of credit facility, maximum borrowing capacity   300.0  
Revolving Credit Facility | Delmarva Power and Light Company      
Short-term Debt [Line Items]      
Line of credit facility, maximum amount outstanding during period   0.0  
Line of credit facility, maximum borrowing capacity   300.0  
Revolving Credit Facility | Atlantic City Electric Company      
Short-term Debt [Line Items]      
Line of credit facility, maximum amount outstanding during period   0.0  
Line of credit facility, maximum borrowing capacity   300.0  
Letter of Credit | Commonwealth Edison Co      
Short-term Debt [Line Items]      
Line of credit facility, maximum borrowing capacity   40.0  
Letter of Credit | PECO Energy Co      
Short-term Debt [Line Items]      
Line of credit facility, maximum borrowing capacity   40.0  
Letter of Credit | Baltimore Gas and Electric Company      
Short-term Debt [Line Items]      
Line of credit facility, maximum borrowing capacity   15.0  
Letter of Credit | Potomac Electric Power Company      
Short-term Debt [Line Items]      
Line of credit facility, maximum borrowing capacity   15.0  
Letter of Credit | Delmarva Power and Light Company      
Short-term Debt [Line Items]      
Line of credit facility, maximum borrowing capacity   15.0  
Letter of Credit | Atlantic City Electric Company      
Short-term Debt [Line Items]      
Line of credit facility, maximum borrowing capacity   $ 15.0