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Reorganization of Business (Net Charges Incurred By Business Segment) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 02, 2016
Jul. 04, 2015
Jul. 02, 2016
Jul. 04, 2015
Restructuring Cost and Reserve [Line Items]        
Reorganization of business charges $ 44 $ 16 $ 67 $ 30
Products        
Restructuring Cost and Reserve [Line Items]        
Reorganization of business charges 33 12 54 22
Services        
Restructuring Cost and Reserve [Line Items]        
Reorganization of business charges $ 11 $ 4 $ 13 $ 8