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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, 2018
Sep. 30, 2016
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Sep. 30, 2016
Oct. 31, 2016
Noncash or Part Noncash Acquisitions [Line Items]                  
Other asset impairments, restructuring and other items         $ 121 $ 1      
Net (gain) loss from sale of long-lived assets and investments         24 $ (2)      
PGT Healthcare Partnership [Member]                  
Noncash or Part Noncash Acquisitions [Line Items]                  
Other asset impairments, restructuring and other items             $ 64    
Write-down of investment             $ 94    
Net (gain) loss from sale of long-lived assets and investments     $ 50            
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