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Mergers, Acquisitions, and Dispositions Merger Transaction Table (Details) - USD ($)
$ / shares in Units, shares in Thousands
3 Months Ended 6 Months Ended
Mar. 23, 2016
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Business Acquisition, Share Price   $ 27.25    
Investments   $ 502,000,000   $ 639,000,000
Shares, Issued   957,616   954,668
Payments to Acquire Businesses, Gross   $ 6,642,000,000 $ 28,000,000  
Preferred Stock [Member]        
Payments to Acquire Businesses, Gross $ 180,000,000      
Pepco Holdings LLC [Member] | Common Stock [Member]        
Payments to Acquire Businesses, Gross   6,933,000,000    
Pepco Holdings LLC [Member] | Preferred Stock [Member]        
Payments to Acquire Businesses, Gross   $ 180,000,000