Reorganization of Business - Net Charges Incurred by Business Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Restructuring Cost and Reserve [Line Items]
Reorganization of business charges	$ 3	$ 44	$ 22	$ 67
Products
Restructuring Cost and Reserve [Line Items]
Reorganization of business charges	3	33	16	54
Services
Restructuring Cost and Reserve [Line Items]
Reorganization of business charges	$ 0	$ 11	$ 6	$ 13