v3.26.3
Supplemental Financial Information - Balance Sheet (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Sep. 30, 2025
Dec. 31, 2024
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents $ 1,469 $ 626 $ 1,533 $ 357
Restricted cash 602 525 516 541
Restricted cash included in other long-term assets 49 50 49 41
Total cash, restricted cash, and cash equivalents 2,120 1,201 2,098 939
Accrued Expenses [Abstract]        
Compensation-related accruals 589 705    
Taxes accrued 243 242    
Interest accrued 495 538    
Other Accrued Liabilities 275      
Commonwealth Edison Co        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 300 159 405 105
Restricted cash 530 454 453 486
Restricted cash included in other long-term assets 49 50 49 41
Total cash, restricted cash, and cash equivalents 879 663 907 632
Accrued Expenses [Abstract]        
Compensation-related accruals 201 209    
Taxes accrued 102 94    
Interest accrued 130 155    
Other Accrued Liabilities 9      
PECO Energy Co        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 107 116 364 48
Restricted cash 0 0 0 0
Restricted cash included in other long-term assets 0 0 0 0
Total cash, restricted cash, and cash equivalents 107 116 364 48
Accrued Expenses [Abstract]        
Compensation-related accruals 68 96    
Taxes accrued 14 306    
Interest accrued 59 75    
Other Accrued Liabilities 218      
Baltimore Gas and Electric Company        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 842 217 663 33
Restricted cash 3 3 2 1
Restricted cash included in other long-term assets 0 0 0 0
Total cash, restricted cash, and cash equivalents 845 220 665 34
Accrued Expenses [Abstract]        
Compensation-related accruals 71 99    
Taxes accrued 34 191    
Interest accrued 108 55    
Other Accrued Liabilities 1      
Pepco Holdings LLC        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 207 103 93 139
Restricted cash 46 38 27 24
Restricted cash included in other long-term assets 0 0 0 0
Total cash, restricted cash, and cash equivalents 253 141 120 163
Accrued Expenses [Abstract]        
Compensation-related accruals 109 125    
Taxes accrued 125 107    
Interest accrued 90 92    
Other Accrued Liabilities 32      
Potomac Electric Power Company        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 79 22 25 30
Restricted cash 39 33 22 21
Restricted cash included in other long-term assets 0 0 0 0
Total cash, restricted cash, and cash equivalents 118 55 47 51
Accrued Expenses [Abstract]        
Compensation-related accruals 30 35    
Taxes accrued 91 69    
Interest accrued 40 49    
Other Accrued Liabilities 21      
Delmarva Power and Light Company        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 79 9 6 21
Restricted cash 2 3 2 2
Restricted cash included in other long-term assets 0 0 0 0
Total cash, restricted cash, and cash equivalents 81 12 8 23
Accrued Expenses [Abstract]        
Compensation-related accruals 21 24    
Taxes accrued 24 25    
Interest accrued 28 18    
Other Accrued Liabilities 4      
Atlantic City Electric Company        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 15 22 25 14
Restricted cash 4 2 3 0
Restricted cash included in other long-term assets 0 0 0 0
Total cash, restricted cash, and cash equivalents 19 24 $ 28 $ 14
Accrued Expenses [Abstract]        
Compensation-related accruals 16 17    
Taxes accrued 10 18    
Interest accrued 19 $ 20    
Other Accrued Liabilities $ 8