Segment and Geographic Data - Net Sales by Geographic Region and Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018
Segment and Geographic Data
Net sales	$ 3,168	$ 3,347
Transportation Solutions
Segment and Geographic Data
Net sales	1,868	1,986
Industrial Solutions
Segment and Geographic Data
Net sales	927	928
Communications Solutions
Segment and Geographic Data
Net sales	373	433
Total Europe/Middle East/Africa
Segment and Geographic Data
Net sales	1,097	1,171
Total Europe/Middle East/Africa | Transportation Solutions
Segment and Geographic Data
Net sales	702	756
Total Europe/Middle East/Africa | Industrial Solutions
Segment and Geographic Data
Net sales	340	350
Total Europe/Middle East/Africa | Communications Solutions
Segment and Geographic Data
Net sales	55	65
Total Asia-Pacific
Segment and Geographic Data
Net sales	1,113	1,173
Total Asia-Pacific | Transportation Solutions
Segment and Geographic Data
Net sales	742	764
Total Asia-Pacific | Industrial Solutions
Segment and Geographic Data
Net sales	145	155
Total Asia-Pacific | Communications Solutions
Segment and Geographic Data
Net sales	226	254
Total Americas
Segment and Geographic Data
Net sales	958	1,003
Total Americas | Transportation Solutions
Segment and Geographic Data
Net sales	424	466
Total Americas | Industrial Solutions
Segment and Geographic Data
Net sales	442	423
Total Americas | Communications Solutions
Segment and Geographic Data
Net sales	$ 92	$ 114