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Reorganization of Business - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 29, 2018
USD ($)
employee
Sep. 30, 2017
USD ($)
Sep. 29, 2018
USD ($)
employee
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Restructuring Cost and Reserve [Line Items]          
Reorganization of business charges $ 25 $ 8 $ 62 $ 30  
Restructuring charges     77    
Adjustments     (15)    
Restructuring reserve 61   61   $ 50
Payments for restructuring     51    
Other charges          
Restructuring Cost and Reserve [Line Items]          
Reorganization of business charges 21 6 46 22  
Costs of sales          
Restructuring Cost and Reserve [Line Items]          
Reorganization of business charges 4 2 16 8  
Employee separation costs          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges 13 7 61 30  
Adjustments     (15) (5)  
Restructuring reserve $ 39   39   41
Payments for restructuring     $ 48    
Restructuring charges in the period for total employee severance (in number of employees) | employee     700    
Number of employees expected to be paid (in number of employees) | employee 500   500    
Exit costs          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges $ 12 $ 1 $ 16 $ 5  
Adjustments     0    
Restructuring reserve $ 22   22   $ 9
Payments for restructuring     $ 3