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Fair value measurements (Details Textual) - USD ($)
$ in Millions
6 Months Ended
Oct. 14, 2015
Jun. 30, 2017
Dec. 31, 2016
Oct. 31, 2015
Business Acquisition [Line Items]        
Length of time hedged in foreign currency contracts (or less)   3 years    
Long-term debt, fair value   $ 37,900 $ 36,500  
Carrying value of debt   35,062 $ 34,596  
Dezima [Member]        
Business Acquisition [Line Items]        
Maximum additional consideration due contingent on milestones       $ 1,250
Estimated fair values of contingent consideration obligations $ 110      
BioVex [Member]        
Business Acquisition [Line Items]        
Business Combination, Additional Contingent Consideration Upon Achievement of Milestones   $ 325    
Other Government-related and Corporate Debt Securities [Member]        
Business Acquisition [Line Items]        
Investment maturity period   5 years