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Stockholders' Equity - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2018
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2013
Class of Stock [Line Items]        
Number of warrants issued (in shares)       13,490,236
Warrant, strike price per share (in dollars per share)       $ 53.8475
Cash paid for partial termination of 1.125% Warrants   $ 113 $ 0  
Unrecognized compensation expense   $ 46    
Unrecognized compensation forfeiture rate   10.80%    
Stock options granted (in shares)   0    
Stock options exercised (in shares)   0    
Restricted Stock Awards        
Class of Stock [Line Items]        
Weighted average period for recognition   3 years 1 month    
Performance Stock Awards        
Class of Stock [Line Items]        
Weighted average period for recognition   8 months    
Performance Stock Units        
Class of Stock [Line Items]        
Weighted average period for recognition   2 years 7 months    
Employee Stock Option        
Class of Stock [Line Items]        
Unrecognized compensation expense   $ 12    
Weighted average period for recognition   2 years 3 months    
Common Stock        
Class of Stock [Line Items]        
Number of common stock issued (in shares)   276,000    
1.625% Convertible Notes | Convertible Notes        
Class of Stock [Line Items]        
Debt conversion (in shares) 1,800,000      
Cash Convertible Senior Notes Due 2020, Warrants        
Class of Stock [Line Items]        
Stated percentage of warrants   1.125%    
Cash paid for partial termination of 1.125% Warrants   $ 113    
Number of warrants terminated (in shares)   2,400,000    
Warrants outstanding (in shares)   11,100,000