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Acquisitions, Research Collaborations and License Agreements - Acquisitions (Details)
$ in Millions, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 01, 2019
USD ($)
Jul. 31, 2019
USD ($)
Apr. 30, 2019
USD ($)
Jun. 30, 2018
AUD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Acquisitions Research Collaborations And License Agreements Transactions [Line Items]                    
Goodwill           $ 19,490   $ 19,490   $ 18,253
Research and development           $ 2,189 $ 2,274 $ 4,119 $ 5,470  
Antelliq                    
Acquisitions Research Collaborations And License Agreements Transactions [Line Items]                    
Payment to acquire business $ 2,300                  
Payment of debt 1,300                  
Transaction costs 47                  
Cash and cash equivalents 31                  
Goodwill $ 1,343                  
Immune Design                    
Acquisitions Research Collaborations And License Agreements Transactions [Line Items]                    
Payment to acquire business     $ 301              
Intangible assets recognized     156              
Cash and cash equivalents     83              
Other assets recognized     31              
Goodwill     $ 31              
Viralytics                    
Acquisitions Research Collaborations And License Agreements Transactions [Line Items]                    
Payment to acquire business       $ 502 $ 378          
Other assets recognized         $ 34   34   34  
Research and development             $ 344   $ 344  
Subsequent Event | Peloton                    
Acquisitions Research Collaborations And License Agreements Transactions [Line Items]                    
Payment to acquire business   $ 1,050                
Potential future milestone payments, maximum   $ 1,150