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Collaborative Arrangements - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 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
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 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           $ 2,123 $ 2,189 $ 4,331 $ 4,119          
Other liabilities, noncurrent           12,446   12,446   $ 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           1,200   1,200            
Adempas | Other intangible assets                            
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                            
Finite-lived intangible assets           832   832            
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   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   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