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Capitalization (Details)
Jan. 22, 2018
USD ($)
employee
$ / shares
shares
Mar. 31, 2018
$ / 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    
Amount of private placement shares | shares 30,120,482    
Common stock, par value (in dollars per share) | $ / shares $ 0.10 $ 0.1 $ 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    
Common stock share cap (in shares) | shares 58,964,222    
RWG number of board members | employee 2    
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    
Series A Convertible Preferred Stock      
Class of Stock [Line Items]      
Preferred stock shares issued | shares 1,616,000 1,616,000  
Par Value, in dollars per share | $ / shares   $ 100  
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    
FE      
Class of Stock [Line Items]      
RWG number of board members | employee 3