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Fair Value Measurements - Details of Long-Term Debt (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jan. 31, 2020
Mar. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 02, 2020
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Cash received for settlement of call option     $ 27 $ 473    
4.375% Notes            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Percentage of contractual interest rate on notes     4.375%      
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            
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 | 4.375% Notes            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Percentage of contractual interest rate on notes         4.375%  
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            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Percentage of contractual interest rate on notes     4.875%      
Convertible debt | 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%     1.125%
Carrying Amount            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Fair value of debt     $ 1,812     $ 1,255
Carrying Amount | Senior notes | 4.375% Notes            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Fair value of debt     789     0
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            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Fair value of debt     327     327
Carrying Amount | Term loan facility            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Fair value of debt     0     220
Carrying Amount | Convertible debt | 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     1,858     1,347
Fair Value | Senior notes | 4.375% Notes            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Fair value of debt     802     0
Fair Value | Senior notes | 5.375% Notes            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Fair value of debt     723     745
Fair Value | Senior notes | 4.875% Notes            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Fair value of debt     333     340
Fair Value | Term loan facility            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Fair value of debt     0     220
Fair Value | Convertible debt | 1.125% Convertible notes            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Fair value of debt     $ 0     $ 42