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Collaborative Arrangements - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 21 Months Ended 29 Months Ended 37 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Jul. 31, 2017
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 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           $ 3,390   $ 3,204 $ 7,721 $ 7,324          
Other liabilities, noncurrent           12,027     12,027   $ 11,970   $ 11,970 $ 11,970  
Lynparza | Other Assets                              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                              
Finite-lived intangible assets           1,300     1,300            
Lenvima | Other Assets                              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                              
Finite-lived intangible assets           1,100     1,100            
Adempas | Other intangible assets                              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                              
Finite-lived intangible assets           $ 838     838            
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                 2,700            
AstraZeneca | Sales-Based Milestones | Lynparza                              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                              
Probable contingent payments collaborative arrangement             $ 400             $ 1,000  
Liabilities             400                
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             135       60 140      
Contingent milestone payments collaborative arrangement                 1,400            
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                 2,700            
Eisai | Sales-Based Milestones | Lenvima                              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                              
Probable contingent payments collaborative arrangement             370           $ 950    
Liabilities             $ 370                
Milestone payments made to collaborative partner                 500   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