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Certain Transactions - Other Transactions - Additional Information (Detail) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended
Jan. 08, 2018
May 12, 2017
Sep. 30, 2016
Mar. 31, 2020
Sep. 30, 2016
Oct. 31, 2016
Alder [Member]            
Noncash or Part Noncash Acquisitions [Line Items]            
Upfront payment $ 25          
Milestone payment       $ 25    
Collaborative agreement milestone payments $ 150          
Otsuka [Member]            
Noncash or Part Noncash Acquisitions [Line Items]            
Upfront payment   $ 50        
Celltrion [Member]            
Noncash or Part Noncash Acquisitions [Line Items]            
Refundable payment           $ 60
Total associated cost           $ 160
Regeneron [Member]            
Noncash or Part Noncash Acquisitions [Line Items]            
Upfront payment         $ 250  
Research and development costs     $ 1,000