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Restructuring - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Apr. 01, 2018
Restructuring Cost and Reserve [Line Items]    
Restructuring charges $ 36 $ 42
Supply Chain    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges 90  
Restructuring charges recorded to date 300  
Supply Chain | Cost of products sold    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges 23  
Supply Chain | Other (income) expense    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges 31  
Supply Chain | Minimum    
Restructuring Cost and Reserve [Line Items]    
Restructuring estimated cost 1,900  
Cost savings expected 600  
Supply Chain | Maximum    
Restructuring Cost and Reserve [Line Items]    
Restructuring estimated cost 2,300  
Cost savings expected 800  
Medical Devices    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges 90  
Medical Devices    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges $ 100 $ 100
Medical Devices | Supply Chain | Minimum    
Restructuring Cost and Reserve [Line Items]    
Period for activity 4 years  
Medical Devices | Supply Chain | Maximum    
Restructuring Cost and Reserve [Line Items]    
Period for activity 5 years