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Restructuring - Narrative (Details)
$ in Millions
 3 Months Ended
Apr. 01, 2018
USD ($)
Employee
Apr. 02, 2017
USD ($)
Restructuring Cost and Reserve [Line Items]    
Restructuring charges $ 42 $ 85
Medical Devices    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges 107  
Restructuring charges recorded to date $ 2,100  
Number of positions eliminated | Employee 2,500  
Number of positions eliminated and receiving severance | Employee 1,800  
Medical Devices | Cost of products sold    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges $ 6  
Medical Devices | Other Income Expense Net    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges $ 59  
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  
Medical Devices    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges 100 $ 200
Medical Devices | Minimum    
Restructuring Cost and Reserve [Line Items]    
Restructuring estimated cost 1,900  
Cost savings expected $ 600  
Period for activity 4 years  
Medical Devices | Maximum    
Restructuring Cost and Reserve [Line Items]    
Restructuring estimated cost $ 2,300  
Cost savings expected $ 800  
Period for activity 5 years  
Estimated cost settled with cash (as a percent) 70.00%