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Collaborative Arrangements - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 18 Months Ended 37 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Apr. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Jul. 31, 2017
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Mar. 31, 2021
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                                        
Research and development                     $ 2,189   $ 2,274   $ 4,119 $ 5,470        
Other liabilities, noncurrent       $ 11,283     $ 12,041       11,283       11,283   $ 12,041   $ 12,041  
Lynparza | Other Assets                                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                                        
Finite-lived intangible assets       1,000             1,000       1,000          
Lenvima | Other Assets                                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                                        
Finite-lived intangible assets       687             687       687          
Adempas | Other intangible assets                                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                                        
Finite-lived intangible assets       956             956       956          
AstraZeneca                                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                                        
Upfront and milestone payments                                   $ 1,600    
License option payment related to collaborative arrangement             $ 400   $ 250 $ 750                    
Research and development                                   $ 2,350    
AstraZeneca | Forecast                                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                                        
License option payment related to collaborative arrangement     $ 100                                  
AstraZeneca | Lynparza                                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                                        
Cumulative amortization expense                     52                  
AstraZeneca | Sales-Based Milestones                                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                                        
Probable contingent payments collaborative arrangement                                     $ 700  
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                     300                  
Liabilities       300             $ 300       300          
Milestone payments made to collaborative partner                                 250      
AstraZeneca | Regulatory Milestones | Lynparza                                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                                        
Milestone payments made to collaborative partner       $ 30 $ 30                       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           $ 325                            
Research and development                           $ 1,400   1,400        
Eisai | Forecast                                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                                        
License option payment related to collaborative arrangement $ 125 $ 200                                   $ 650
Eisai | Lenvima                                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                                        
Cumulative amortization expense                       $ 35                
Eisai | Sales-Based Milestones                                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                                        
Contingent milestone payments collaborative arrangement               3,970             3,420          
Eisai | Sales-Based Milestones | Lenvima                                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                                        
Probable contingent payments collaborative arrangement                       282         268      
Liabilities           $ 282           $ 282                
Milestone payments made to collaborative partner                             50          
Eisai | Regulatory Milestones                                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                                        
Contingent milestone payments collaborative arrangement               $ 385             135          
Eisai | Regulatory Milestones | Lenvima                                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                                        
Milestone payments made to collaborative partner                                 $ 250      
Bayer AG | Adempas                                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                                        
Cumulative amortization expense                         106              
Bayer AG | Sales-Based Milestones                                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                                        
Probable contingent payments collaborative arrangement                         375              
Milestone payments made to collaborative partner                           $ 350            
Contingent milestone payments collaborative arrangement                             $ 400          
Other liabilities, noncurrent                         $ 375     $ 375