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Capitalization - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 22, 2019
Jan. 22, 2018
Jan. 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Class of Stock [Line Items]                
Dividends declared (in usd per share)           $ 0.38 $ 0.72  
Proceeds from issuance of equity   $ 2,500,000,000            
Par Value, in dollars per share   $ 100   $ 100   100   $ 100
Amount of private placement shares   30,120,482            
Common stock, par value (in dollars per share)   $ 0.10   $ 0.1   $ 0.1   $ 0.1
Amount of private placement   $ 850,000,000            
Conversion threshold of Preferred Stock (in shares)   323,200            
Number of shares to be converted within two years   0            
Common stock share cap (in shares)   58,964,222            
Amortization of beneficial conversion       $ 0 $ 148,000,000 $ 0 $ 261,000,000  
Liquidation preference value   $ 1,000            
Conversion price (in dollars per share)       $ 27.42   $ 27.42    
Preferred stock shares outstanding     209,822          
Preferred Stock                
Class of Stock [Line Items]                
Number of shares converted (in shares)     494,767         911,411
OPIC                
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)     18,044,018         33,238,910
Series A Convertible Preferred Stock                
Class of Stock [Line Items]                
Preferred stock shares issued   1,616,000   1,616,000   1,616,000   1,616,000
Amount of preferred stock investment   $ 1,620,000,000            
Preferred stock shares outstanding       209,822   209,822   704,589
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 | OPIC                
Class of Stock [Line Items]                
Amount of preferred stock investment   $ 1,460,000,000            
Subsequent Event                
Class of Stock [Line Items]                
Preferred stock shares outstanding 181,520              
Subsequent Event | Preferred Stock                
Class of Stock [Line Items]                
Number of shares converted (in shares) 28,302              
Subsequent Event | Common Stock                
Class of Stock [Line Items]                
Number of shares issued (in shares) 1,032,165