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Debt - Schedule of Long-Term Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Jun. 02, 2020
Dec. 31, 2019
Current portion of long-term debt:      
Current portion of long-term debt $ 0   $ 18
Non-current portion of long-term debt:      
Deferred debt issuance costs (17)   (7)
Long-term debt $ 1,813   1,237
1.125% Convertible Notes, net of unamortized discount      
Non-current portion of long-term debt:      
Percentage of contractual interest rate on notes 1.125%    
4.375% Notes      
Non-current portion of long-term debt:      
Percentage of contractual interest rate on notes 4.375%    
5.375% Notes      
Non-current portion of long-term debt:      
Percentage of contractual interest rate on notes 5.375%    
4.875% Notes due 2025      
Non-current portion of long-term debt:      
Percentage of contractual interest rate on notes 4.875%    
Term loan facility | Term loan facility      
Current portion of long-term debt:      
Debt net of unamortized discount $ 0   6
Non-current portion of long-term debt:      
Debt net of unamortized debt discount 0   214
1.125% Convertible Notes, net of unamortized discount | 1.125% Convertible Notes, net of unamortized discount      
Current portion of long-term debt:      
Debt net of unamortized discount $ 0   $ 12
Non-current portion of long-term debt:      
Percentage of contractual interest rate on notes 1.125%   1.125%
Senior notes | 4.375% Notes      
Non-current portion of long-term debt:      
Debt net of unamortized debt discount $ 800   $ 0
Percentage of contractual interest rate on notes   4.375%  
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 due 2025      
Non-current portion of long-term debt:      
Debt net of unamortized debt discount $ 330   $ 330
Percentage of contractual interest rate on notes 4.875%