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Variable Interest Entities - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Apr. 01, 2014
Variable Interest Entity [Line Items]    
Guarantee obligations maximum exposure $ 69  
CENG [Member]    
Variable Interest Entity [Line Items]    
Ownership Percentage Of Consolidated Variable Interest Entities 50.01%  
Due from Affiliates $ 571 $ 400
Payment Guarantee [Member] | CENG [Member]    
Variable Interest Entity [Line Items]    
Guarantee obligations maximum exposure   245
Financial Guarantee [Member] | CENG [Member]    
Variable Interest Entity [Line Items]    
Guarantee obligations maximum exposure   165
Equity interest member [Member] | 2015 ESA Investco, LLC [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage 90.00%  
Exelon Generation Co L L C [Member] | Exelon Generation Co L L C [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage 100.00%  
Ownership Percentage Of Consolidated Variable Interest Entities 100.00%  
Exelon Generation Co L L C [Member] | CENG [Member]    
Variable Interest Entity [Line Items]    
Parental guarantee provided $ 688  
Ownership Percentage Of Consolidated Variable Interest Entities 50.01%  
Ownership interest 50.01%  
Due from Affiliates $ 571 $ 400
Exelon Generation Co L L C [Member] | Antelope Valley [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage 100.00%  
Exelon Generation Co L L C [Member] | Equity interest member [Member] | Bloom IV [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage 90.00%  
Exelon Generation Co L L C [Member] | Equity interest member [Member] | EGRP [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage 51.00%  
Exelon Generation Co L L C [Member] | Equity interest member [Member] | Bloom V [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage 31.00%  
Pepco Holdings LLC [Member]    
Variable Interest Entity [Line Items]    
Guarantee obligations maximum exposure $ 69  
Atlantic City Electric Company [Member]    
Variable Interest Entity [Line Items]    
Guarantee obligations maximum exposure $ 18