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Fair Value Measurements - Details of Long-Term Debt (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Sep. 30, 2019
Mar. 31, 2019
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash received for settlement of call option $ 27   $ 115  
Current liabilities: Derivative liability | 1.125% Conversion Option        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative liabilities $ 0     $ 29
5.375% Notes        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Percentage of contractual interest rate on notes 5.375%      
4.875% Notes due 2025        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Percentage of contractual interest rate on notes 4.875%      
1.125% Convertible Notes        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Percentage of contractual interest rate on notes 1.125%      
Senior Notes | 5.375% Notes        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Percentage of contractual interest rate on notes 5.375%      
Senior Notes | 4.875% Notes due 2025        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Percentage of contractual interest rate on notes 4.875%      
Convertible Notes | 1.125% Convertible Notes        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash received for settlement of call option $ 27      
Repayments of debt   $ 39    
Debt net of unamortized discount $ 0     12
Percentage of contractual interest rate on notes 1.125%      
Carrying Amount        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair value of debt $ 1,622     1,255
Carrying Amount | Senior Notes | 5.375% Notes        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair value of debt 696     696
Carrying Amount | Senior Notes | 4.875% Notes due 2025        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair value of debt 326     327
Carrying Amount | Term Loan Facility        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair value of debt 600     220
Carrying Amount | Convertible Notes | 1.125% Convertible Notes        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair value of debt 0     12
Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair value of debt 1,611     1,347
Fair Value | Senior Notes | 5.375% Notes        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair value of debt 701     745
Fair Value | Senior Notes | 4.875% Notes due 2025        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair value of debt 310     340
Fair Value | Term Loan Facility        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair value of debt 600     220
Fair Value | Convertible Notes | 1.125% Convertible Notes        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair value of debt $ 0     $ 42