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Capitalization (Details)
Sep. 30, 2018
$ / shares
shares
Jan. 22, 2018
USD ($)
employee
$ / shares
shares
Dec. 31, 2017
$ / shares
Class of Stock [Line Items]      
Proceeds from issuance of equity   $ 2,500,000,000  
Par Value, in dollars per share | $ / shares $ 100 $ 100  
Amount of private placement shares | shares   30,120,482  
Common stock, par value (in dollars per share) | $ / shares $ 0.1 $ 0.10 $ 0.1
Amount of private placement   $ 850,000,000  
Liquidation preference value   $ 1,000  
Conversion price (in dollars per share) | $ / shares   $ 27.42  
Conversion threshold of Preferred Stock (in shares) | shares   323,200  
Number of shares to be converted within two years | shares   0  
Common stock share cap (in shares) | shares   58,964,222  
RWG number of board members | employee   2  
Preferred Stock      
Class of Stock [Line Items]      
Number of shares converted (in shares) | shares 911,411    
Other Paid-in Capital      
Class of Stock [Line Items]      
Amount of private placement   $ 847,000,000  
Common Stock      
Class of Stock [Line Items]      
Amount of private placement   $ 3,000,000  
Number of shares issued (in shares) | shares 33,238,910    
Series A Convertible Preferred Stock      
Class of Stock [Line Items]      
Preferred stock shares issued | shares 1,616,000 1,616,000  
Amount of preferred stock investment   $ 1,620,000,000  
Series A Convertible Preferred Stock | Preferred Stock      
Class of Stock [Line Items]      
Amount of preferred stock investment   162,000,000  
Series A Convertible Preferred Stock | Other Paid-in Capital      
Class of Stock [Line Items]      
Amount of preferred stock investment   $ 1,460,000,000  
FirstEnergy      
Class of Stock [Line Items]      
RWG number of board members | employee   3