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Acquisitions, Divestitures, Equity-Method Investments, Licensing Arrangement, Collaborative Arrangements and Research and Development Arrangement - Collaborative Arrangements (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2023
Oct. 03, 2022
Jan. 04, 2022
Dec. 30, 2021
Dec. 24, 2021
Jul. 21, 2021
Dec. 31, 2021
Oct. 03, 2021
Apr. 04, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Acquired in-process research and development expenses                   $ 194 $ 953 $ 3,469
Biohaven [Member]                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Business acquisition, per share in cash (in dollars per share)   $ 148.50                    
Business acquisition, cash payment   $ 11,500                    
Collaborative Arrangement [Member]                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Acquired in-process research and development expenses [1]                   $ 13 $ 339 1,056
Collaborative Arrangement [Member] | BioNTech [Member]                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Ownership percentage 2.70%                      
Collaborative Arrangement [Member] | Arvinas, Inc [Member]                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Ownership percentage 5.10%                      
Collaborative Arrangement [Member] | Biohaven [Member]                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Cash payment to collaborators     $ 500                  
Upfront payment to collaborators     150                  
Committed investment from collaborator     350                  
Acquired in-process research and development expenses     $ 263                  
Collaborative Arrangement [Member] | BioNTech [Member]                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Proceeds received from upfront payments and milestone payments                       $ 188
Collaborative Arrangement [Member] | BioNTech [Member] | Shingles Vaccine Program, mRNA-Based [Member]                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Committed investment from collaborator       $ 150                
Payment to collaborators       225                
Potential future milestone payments       200                
Collaborative Arrangement [Member] | BioNTech [Member] | Shingles Vaccine Program, mRNA-Based [Member] | Acquired In-Process Research and Development Expense [Member]                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Cash payment to collaborators       75                
Proceeds received from upfront payments and milestone payments       $ 25                
Collaborative Arrangement [Member] | BioNTech [Member] | Coronavirus Vaccine Program, mRNA-Based [Member]                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Percentage of costs to be reimbursed                 50.00%      
Collaborative Arrangement [Member] | Beam [Member]                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Potential future milestone payments         $ 1,050              
Acquired in-process research and development expenses             $ 300          
Maximum potential consideration         $ 1,350              
Development cost ownership percentage         65.00%              
Collaborative Arrangement [Member] | Beam [Member] | Beam [Member]                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Development cost ownership percentage         35.00%              
Collaborative Arrangement [Member] | Arvinas, Inc [Member]                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Committed investment from collaborator           $ 350            
Acquired in-process research and development expenses               $ 706        
Collaborative arrangement, milestone payment upon approval (up to)           400            
Collaborative arrangement, milestone payment upon commercializing (up to)           1,000            
Collaborative Arrangement [Member] | Arvinas, Inc [Member] | Acquired In-Process Research and Development Expense [Member]                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Cash payment to collaborators           $ 650            
[1] Primarily relates to upfront payments to our partners as well as premiums paid on our equity investments in the common stock of our partners.