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Mergers, Acquisitions and Dispositions Merger Transaction Table (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Mar. 23, 2016
Dec. 31, 2013
Business Acquisition, Share Price       $ 27.25  
Investments $ 629 $ 639      
Shares, Issued 958,778 954,668 894,568   892,034
Payments to Acquire Businesses, Gross $ 6,934 $ 40 $ 386    
Pepco Holdings LLC [Member] | Predecessor [Member]          
Investments   80      
Goodwill, Other Increase (Decrease)   $ (6)      
Pepco Holdings LLC [Member] | Successor [Member]          
Investments 133        
Pepco Holdings LLC [Member] | Common Stock [Member]          
Payments to Acquire Businesses, Gross $ 6,933