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Jointly Owned Electric Utility Plant - Ownership Interests in Jointly Owned Electric Plants and Transmission Facilities (Details)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
V
mi
Dec. 31, 2020
USD ($)
Delaware And New Jersey [Member]    
Schedule Of Jointly Owned Utility Plant Net Ownership [Abstract]    
Miles of transmission voltage lines | mi 151.3  
Transmission line capacity 500  
Delaware River Crossing [Member]    
Schedule Of Jointly Owned Utility Plant Net Ownership [Abstract]    
Miles of transmission voltage lines | mi 2.5  
Transmission line capacity 500  
New Freedom Switching [Member]    
Schedule Of Jointly Owned Utility Plant Net Ownership [Abstract]    
Transmission line capacity 500  
Electric Transmission [Member] | Delaware And New Jersey [Member]    
Schedule Of Jointly Owned Utility Plant Net Ownership [Abstract]    
Plant | $ $ 103 $ 103
Accumulated depreciation | $ $ 55 $ 54
PECO Energy Co [Member] | Delaware And New Jersey [Member]    
Schedule Of Jointly Owned Utility Plant Net Ownership [Abstract]    
Ownership interest 42.55%  
PECO Energy Co [Member] | Delaware River Crossing [Member]    
Schedule Of Jointly Owned Utility Plant Net Ownership [Abstract]    
Ownership interest 42.55%  
Delmarva Power & Light Company [Member] | Delaware And New Jersey [Member]    
Schedule Of Jointly Owned Utility Plant Net Ownership [Abstract]    
Ownership interest 1.00%  
Delmarva Power & Light Company [Member] | Delaware River Crossing [Member]    
Schedule Of Jointly Owned Utility Plant Net Ownership [Abstract]    
Ownership interest 7.45%  
Atlantic City Electric Company [Member] | Delaware And New Jersey [Member]    
Schedule Of Jointly Owned Utility Plant Net Ownership [Abstract]    
Ownership interest 13.90%  
Atlantic City Electric Company [Member] | Delaware River Crossing [Member]    
Schedule Of Jointly Owned Utility Plant Net Ownership [Abstract]    
Ownership interest 7.45%  
Atlantic City Electric Company [Member] | New Freedom Switching [Member]    
Schedule Of Jointly Owned Utility Plant Net Ownership [Abstract]    
Ownership interest 21.78%