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Mergers, Acquisitions and Dispositions - Dispositions Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Feb. 28, 2018
Jun. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Business Dispositions [Line Items]        
Assets held for sale   $ 880   $ 904
Liabilities held for sale   764   777
Exelon Generation Co L L C [Member]        
Business Dispositions [Line Items]        
Assets held for sale   880   904
Liabilities held for sale   764   777
Oyster Creek [Member]        
Business Dispositions [Line Items]        
Assets held for sale   863   897
Liabilities held for sale   759   777
Asset Retirement Obligation Revision Of Estimate In Operating And Maintenance Expense   9 $ 84  
Oyster Creek [Member] | Exelon Generation Co L L C [Member]        
Business Dispositions [Line Items]        
Assets held for sale   863   897
Liabilities held for sale   759   $ 777
Asset Retirement Obligation Revision Of Estimate In Operating And Maintenance Expense   $ 9 $ 84  
Electrical Contracting Business [Member]        
Business Dispositions [Line Items]        
Proceeds from Divestiture of Businesses $ 87      
Electrical Contracting Business [Member] | Exelon Generation Co L L C [Member]        
Business Dispositions [Line Items]        
Proceeds from Divestiture of Businesses $ 87