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Chapter 11 Proceedings and Ability to continue as a Going Concern - Restructuring Support Agreement (Details) - Restructuring Support Agreement - USD ($)
shares in Thousands, $ in Millions
Sep. 09, 2019
Sep. 11, 2019
Aug. 23, 2019
May 10, 2019
Class of Stock [Line Items]        
Percent of common stock exchanged for existing equity   1.00%    
Percent of cash flow prong removed 125.00%      
Percent of ordinary shares exchanged for cancelled notes   99.00%    
Percent of common stock exchanged for warrants   10.00%    
Amount arranged under DIP Agreement   $ 600    
Common Stock        
Class of Stock [Line Items]        
Shares held under amendment two of RSA (in shares)     208,000  
Warrants     250  
Senior Notes        
Class of Stock [Line Items]        
Face amount of debt   500   $ 2,500
Senior Notes | Exit Notes        
Class of Stock [Line Items]        
Face amount of debt $ 2,100 2,100    
Senior Notes | Exit Notes, Takeback Notes        
Class of Stock [Line Items]        
Face amount of debt 500      
Senior Notes | Exit Notes, Rights Offering Notes        
Class of Stock [Line Items]        
Face amount of debt $ 1,600 $ 1,600    
Stated interest rate on debt 11.00%