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Debt - Schedule of Long-Term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Jan. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Percentage of contractual interest rate 4.875%    
Total (1) $ 0   $ 18
Less: debt issuance costs (23)   (7)
Total $ 2,127   $ 1,237
Convertible Debt | 1.125% Convertible Notes      
Debt Instrument [Line Items]      
Percentage of contractual interest rate 1.125% 1.125% 1.125%
Current portion of long-term debt $ 0 $ 12 $ 12
Convertible Debt | 4.875% Notes      
Debt Instrument [Line Items]      
Percentage of contractual interest rate 4.875%    
Term loan facility | Term loan facility      
Debt Instrument [Line Items]      
Current portion of long-term debt $ 0   6
Non-current portion of long-term debt $ 0   214
Senior Notes | 4.375% Notes      
Debt Instrument [Line Items]      
Percentage of contractual interest rate 4.375%    
Non-current portion of long-term debt $ 800   0
Senior Notes | 5.375% Notes      
Debt Instrument [Line Items]      
Percentage of contractual interest rate 5.375%    
Non-current portion of long-term debt $ 700   700
Senior Notes | 3.875% Notes      
Debt Instrument [Line Items]      
Percentage of contractual interest rate 3.875%    
Non-current portion of long-term debt $ 650   0
Senior Notes | 4.875% Notes      
Debt Instrument [Line Items]      
Percentage of contractual interest rate 4.875%    
Non-current portion of long-term debt $ 0   $ 330