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Restructuring - Narrative (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jul. 01, 2018
USD ($)
Jul. 02, 2017
USD ($)
Jul. 01, 2018
USD ($)
Employee
Jul. 02, 2017
USD ($)
Restructuring Cost and Reserve [Line Items]        
Restructuring charges $ 57 $ 11 $ 99 $ 96
Supply Chain        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 59      
Supply Chain | Cost of products sold        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 25      
Supply Chain | Other (income) expense        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 21      
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  
Estimated cost settled with cash (as a percent)     70.00%  
Medical Devices        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 117   $ 283  
Restructuring charges recorded to date 2,300   $ 2,300  
Number of positions eliminated | Employee     2,600  
Number of positions eliminated and receiving severance | Employee     1,900  
Medical Devices | Cost of products sold        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 19      
Medical Devices | Other (income) expense        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 54      
Medical Devices | Minimum        
Restructuring Cost and Reserve [Line Items]        
Positions eliminated (as a percent)     5.00%  
Medical Devices | Maximum        
Restructuring Cost and Reserve [Line Items]        
Restructuring estimated cost 2,400   $ 2,400  
Medical Devices        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges $ 100 $ 100 $ 200 $ 300
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