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Mergers, Acquisitions, and Dispositions Merger Transaction Table (Details) - USD ($)
$ / shares in Units, shares in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 23, 2016
Mar. 31, 2015
Dec. 31, 2015
Business Acquisition, Share Price $ 27.25      
Investments $ 455,000,000     $ 639,000,000
Shares, Issued 956,802     954,668
Payments to Acquire Businesses, Gross $ 6,645,000,000   $ 15,000,000  
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      
Pepco Holdings, LLC [Member] | Deferred Compensation, Share-based Payments [Member]        
Payments to Acquire Businesses, Gross $ 29,000,000