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Business combinations (Details Textual) - USD ($)
$ in Millions
Aug. 25, 2019
Jul. 15, 2019
Sep. 30, 2019
Dec. 31, 2018
Business Acquisition [Line Items]        
Goodwill     $ 14,705 $ 14,699
Nuevolution        
Business Acquisition [Line Items]        
Business Combination, Consideration Transferred   $ 183    
Goodwill   26    
Fair value of liabilities assumed, deferred tax liabilities   22    
Fair value of assets acquired and liabilities assumed, net other assets and liabilities   29    
Nuevolution | R & D Technology rights        
Business Acquisition [Line Items]        
Finite-lived Intangible Assets Acquired   $ 150    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   10 years    
Celgene        
Business Acquisition [Line Items]        
Business Combination, Consideration Transferred $ 13,400