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Mergers, Acquisitions and Dispositions - Summary of Pro-forma Impact of the Merger (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 23, 2016
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]          
Business Acquisition, Pro Forma Revenue     $ 32,342 [1] $ 33,823 [2]  
Business Acquisition, Pro Forma Net Income (Loss)     $ 1,562 [1] $ 2,618 [2]  
Business Acquisition, Pro Forma Earnings Per Share, Basic     $ 1.69 [1] $ 2.85 [2]  
Business Acquisition, Pro Forma Earnings Per Share, Diluted     $ 1.69 [1] $ 2.84 [2]  
Merger and integration related costs     $ 558   $ 44
Consolidation, Eliminations [Member]          
Business Acquisition [Line Items]          
Business Acquisition, Pro Forma Revenue     171 $ 559  
Merger and integration related costs     680 $ 92  
Exelon Generation Co L L C [Member]          
Business Acquisition [Line Items]          
Merger and integration related costs     53   44
Pepco Holdings LLC [Member] | Predecessor [Member]          
Business Acquisition [Line Items]          
Merger and integration related costs $ 0       0
Pepco Holdings LLC [Member] | Successor [Member]          
Business Acquisition [Line Items]          
Merger and integration related costs   $ 317      
Potomac Electric Power Company [Member]          
Business Acquisition [Line Items]          
Merger and integration related costs     125   0
Delmarva Power and Light Company [Member]          
Business Acquisition [Line Items]          
Merger and integration related costs     82   0
Atlantic City Electric Company [Member]          
Business Acquisition [Line Items]          
Merger and integration related costs     $ 110   $ 0
[1] The amounts above exclude non-recurring costs directly related to the merger of $680 million and intercompany revenue of $171 million for year ended December 31, 2016
[2] The amounts above exclude non-recurring costs directly related to the merger of $92 million and intercompany revenue of $559 million for the year ended December 31, 2015