Segment and Geographic Data - Operating Income by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 27, 2019	Sep. 28, 2018	Sep. 29, 2017
Segment and Geographic Data
Operating income	$ 1,978	$ 2,331	$ 1,876
Transportation Solutions
Segment and Geographic Data
Operating income	1,226	1,578	1,294
Industrial Solutions
Segment and Geographic Data
Operating income	543	465	364
Communications Solutions
Segment and Geographic Data
Operating income	$ 209	$ 288	$ 218