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Debt - Narrative (Details)
1 Months Ended 3 Months Ended
Mar. 23, 2021
USD ($)
Mar. 08, 2021
USD ($)
Aug. 21, 2018
Aug. 30, 2018
USD ($)
day
$ / shares
Jun. 30, 2014
USD ($)
day
$ / shares
Apr. 04, 2021
USD ($)
renewal
$ / shares
Mar. 29, 2020
USD ($)
Jan. 03, 2021
USD ($)
Term Notes                
Debt Instrument [Line Items]                
Net proceeds $ 992,000,000              
Redemption price, percentage           100.00%    
Interest expense recognized           $ 1,000,000    
Convertible Senior Notes                
Debt Instrument [Line Items]                
Interest expense recognized           11,000,000 $ 11,000,000  
2023 Term Notes | Term Notes                
Debt Instrument [Line Items]                
Stated rate 0.55%              
Principal amount of notes outstanding $ 500,000,000         500,000,000    
2031 Term Notes | Term Notes                
Debt Instrument [Line Items]                
Stated rate 2.55%              
Principal amount of notes outstanding $ 500,000,000         500,000,000    
2023 Convertible Notes | Convertible Senior Notes                
Debt Instrument [Line Items]                
Stated rate       0.00%        
Principal amount of notes outstanding       $ 750,000,000   750,000,000   $ 750,000,000
Redemption price, percentage       100.00%        
Effective interest rate used to measure fair value of convertible senior note       3.70%        
Conversion rate     0.0021845          
Conversion price (in dollars per share) | $ / shares       $ 457.77        
Threshold common stock trading days | day       20        
Threshold consecutive common stock trading days | day       30        
Threshold percentage of common stock price trigger       130.00%        
Threshold note trading days | day       5        
Threshold consecutive note trading days | day       10        
Threshold percentage of note price trigger       98.00%        
Convertible stock price trigger (in dollars per share) | $ / shares       $ 595.10        
2021 Convertible Notes                
Debt Instrument [Line Items]                
Cash paid for principal of notes converted           27,000,000    
2021 Convertible Notes | Convertible Senior Notes                
Debt Instrument [Line Items]                
Stated rate         0.50%      
Principal amount of notes outstanding         $ 517,000,000 $ 491,000,000   $ 517,000,000
Effective interest rate used to measure fair value of convertible senior note         3.50%      
Conversion rate         0.0039318      
Conversion price (in dollars per share) | $ / shares         $ 254.34      
Threshold common stock trading days | day         20      
Threshold consecutive common stock trading days | day         30      
Threshold percentage of common stock price trigger         130.00%      
Threshold note trading days | day         5      
Threshold consecutive note trading days | day         10      
Threshold percentage of note price trigger         98.00%      
Convertible stock price trigger (in dollars per share) | $ / shares           $ 330.64    
Debt instrument, convertible, if-converted value in excess of principal           $ 275,000,000    
The Credit Agreement | Line of Credit                
Debt Instrument [Line Items]                
Debt instrument term, number of renewal | renewal           2    
Debt instrument, renewal term           1 year    
Borrowings outstanding           $ 0    
The Credit Agreement | Line of Credit | Revolving Credit Facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity   $ 750,000,000            
Debt instrument term   5 years            
The Credit Agreement | Line of Credit | Swingline Borrowings                
Debt Instrument [Line Items]                
Maximum borrowing capacity   $ 40,000,000            
The Credit Agreement | Line of Credit | Letter of Credit                
Debt Instrument [Line Items]                
Maximum borrowing capacity   50,000,000            
The Credit Agreement | Unsecured Debt                
Debt Instrument [Line Items]                
Debt instrument, face amount, optional increase in additional borrowings   $ 250,000,000            
Debt instrument, covenant, minimum debt to EBITDA ratio           3.50    
Debt instrument, covenant, minimum debt to EBITDA ratio upon consummation of acquisition           4.00    
Bridge Facility | Unsecured Debt                
Debt Instrument [Line Items]                
Principal amount of notes outstanding           $ 1,000,000,000    
Debt instrument term           364 days