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Collaborative Arrangements - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended 21 Months Ended 29 Months Ended 37 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Jan. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Jul. 31, 2017
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2019
Mar. 31, 2021
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                          
Research and development             $ 2,209 $ 1,931          
Other liabilities, noncurrent   $ 11,550         11,550   $ 11,970   $ 11,970 $ 11,970  
Lynparza | Other Assets                          
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                          
Finite-lived intangible assets   928         928            
Lenvima | Other Assets                          
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                          
Finite-lived intangible assets   921         921            
Adempas | Other intangible assets                          
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                          
Finite-lived intangible assets   844         844            
AstraZeneca                          
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                          
Upfront and milestone payments           $ 1,600              
License option payment related to collaborative arrangement           $ 750              
AstraZeneca | Sales-Based Milestones                          
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                          
Contingent milestone payments collaborative arrangement             3,100            
AstraZeneca | Sales-Based Milestones | Lynparza                          
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                          
Probable contingent payments collaborative arrangement                       $ 1,000  
Milestone payments made to collaborative partner     $ 250           200 $ 250      
AstraZeneca | Regulatory Milestones | Lynparza                          
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                          
Milestone payments made to collaborative partner                 60 140      
Contingent milestone payments collaborative arrangement             1,700            
Eisai                          
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                          
Upfront and milestone payments         $ 750                
License option payment related to collaborative arrangement   $ 200   $ 325                  
Eisai | Forecast                          
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                          
License option payment related to collaborative arrangement $ 125                       $ 650
Eisai | Sales-Based Milestones                          
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                          
Contingent milestone payments collaborative arrangement             3,000            
Eisai | Sales-Based Milestones | Lenvima                          
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                          
Probable contingent payments collaborative arrangement                     $ 950    
Milestone payments made to collaborative partner             300   $ 50        
Eisai | Regulatory Milestones                          
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                          
Contingent milestone payments collaborative arrangement             135            
Eisai | Regulatory Milestones | Lenvima                          
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                          
Milestone payments made to collaborative partner                   250      
Bayer AG | Sales-Based Milestones                          
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                          
Probable contingent payments collaborative arrangement                   725      
Milestone payments made to collaborative partner                   $ 350      
Contingent milestone payments collaborative arrangement             $ 400