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Restructuring - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Restructuring Cost and Reserve [Line Items]        
Restructuring charges $ 57 $ 57 $ 93 $ 99
Supply Chain        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 142   232  
Restructuring charges recorded to date 500   500  
Supply Chain | Cost of products sold        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 38   61  
Supply Chain | Other (income) expense        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 47   78  
Supply Chain | Minimum        
Restructuring Cost and Reserve [Line Items]        
Restructuring estimated cost 1,900   1,900  
Cost savings expected 600   600  
Supply Chain | Maximum        
Restructuring Cost and Reserve [Line Items]        
Restructuring estimated cost 2,300   2,300  
Cost savings expected 800   800  
Medical Devices        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges     232  
Medical Devices        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges $ 100 $ 100 $ 100 $ 200
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