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Debt - Schedule of Long-Term Debt (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Jun. 06, 2017
Current portion of long-term debt:      
Lease financing obligations $ 1 $ 1  
Debt issuance costs (2) (4)  
Current portion of long-term debt 484 653  
Non-current portion of long-term debt:      
Debt issuance costs (11) (12)  
Senior notes 1,019 1,318  
Lease financing obligations 198 198  
Total debt $ 1,701 2,169  
1.125% Convertible Notes      
Non-current portion of long-term debt:      
Percentage of contractual interest rate on Notes 1.125%    
Convertible Notes | 1.125% Convertible Notes      
Current portion of long-term debt:      
Debt net of unamortized discount $ 422 $ 499  
Non-current portion of long-term debt:      
Percentage of contractual interest rate on Notes 1.125% 1.125%  
Convertible Notes | 1.625% Convertible Notes      
Current portion of long-term debt:      
Debt net of unamortized discount $ 63 $ 157  
Non-current portion of long-term debt:      
Percentage of contractual interest rate on Notes 1.625%    
Senior Notes | 5.375% Notes      
Non-current portion of long-term debt:      
Debt net of unamortized debt discount $ 700 700  
Percentage of contractual interest rate on Notes 5.375%    
Senior Notes | 4.875% Notes      
Non-current portion of long-term debt:      
Debt net of unamortized debt discount $ 330 330  
Percentage of contractual interest rate on Notes 4.875%   4.875%
Credit Facility      
Non-current portion of long-term debt:      
Debt net of unamortized debt discount $ 0 $ 300