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Property, plant and equipment (Schedule) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Land $ 259 $ 263  
Buildings and improvements 3,857 3,757  
Manufacturing equipment 2,865 2,655  
Laboratory equipment 1,257 1,236  
Fixed equipment 2,406 2,338  
Capitalized software 1,216 1,154  
Other 1,091 975  
Construction in progress 915 907  
Property, plant and equipment, gross 13,866 13,285  
Less accumulated depreciation and amortization (8,977) (8,357)  
Property, plant and equipment, net 4,889 4,928  
Depreciation and amortization charges associated with property, plant and equipment $ 640 $ 635 $ 630
Buildings and improvements [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 10 years    
Buildings and improvements [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 40 years    
Manufacturing equipment [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 8 years    
Manufacturing equipment [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 12 years    
Laboratory equipment [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 8 years    
Laboratory equipment [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 12 years    
Fixed equipment [Member]      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 12 years    
Capitalized software [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 3 years    
Capitalized software [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 5 years    
Other [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 5 years    
Other [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 10 years