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Mergers, Acquisitions and Dispositions - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Feb. 28, 2018
Sep. 30, 2018
Mar. 31, 2019
Dec. 31, 2018
Business Dispositions [Line Items]        
Assets held for sale     $ 890 $ 904
Liabilities held for sale     799 777
Proceeds from Divestiture of Businesses $ 87      
Exelon Generation Co L L C [Member]        
Business Dispositions [Line Items]        
Assets held for sale     890 904
Liabilities held for sale     799 777
Proceeds from Divestiture of Businesses $ 87      
Oyster Creek [Member]        
Business Dispositions [Line Items]        
Assets held for sale     888 897
Liabilities held for sale     765 777
Oyster Creek [Member] | Exelon Generation Co L L C [Member]        
Business Dispositions [Line Items]        
Assets held for sale     888 897
Liabilities held for sale     $ 765 $ 777
Asset Retirement Obligation Revision Of Estimate In Operating And Maintenance Expense   $ 84