Reorganization of Business - Net Charges Incurred by Business Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Restructuring Cost and Reserve [Line Items]
Reorganization of business charges	$ 13	$ 18	$ 72	$ 37
Products and Systems Integration
Restructuring Cost and Reserve [Line Items]
Reorganization of business charges	10	14	58	29
Software and Services
Restructuring Cost and Reserve [Line Items]
Reorganization of business charges	$ 3	$ 4	$ 14	$ 8