Segment and Geographic Data - Net Sales by Geographic Region and Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 27, 2020	Mar. 29, 2019	Mar. 27, 2020	Mar. 29, 2019
Segment and Geographic Data
Net sales	$ 3,195	$ 3,412	$ 6,363	$ 6,759
Transportation Solutions
Segment and Geographic Data
Net sales	1,857	1,971	3,725	3,957
Industrial Solutions
Segment and Geographic Data
Net sales	962	1,007	1,889	1,935
Communications Solutions
Segment and Geographic Data
Net sales	376	434	749	867
Total Europe/Middle East/Africa
Segment and Geographic Data
Net sales	1,188	1,276	2,285	2,447
Total Europe/Middle East/Africa | Transportation Solutions
Segment and Geographic Data
Net sales	766	824	1,468	1,580
Total Europe/Middle East/Africa | Industrial Solutions
Segment and Geographic Data
Net sales	361	382	701	732
Total Europe/Middle East/Africa | Communications Solutions
Segment and Geographic Data
Net sales	61	70	116	135
Total Asia-Pacific
Segment and Geographic Data
Net sales	991	1,070	2,104	2,243
Total Asia-Pacific | Transportation Solutions
Segment and Geographic Data
Net sales	631	674	1,373	1,438
Total Asia-Pacific | Industrial Solutions
Segment and Geographic Data
Net sales	138	155	283	310
Total Asia-Pacific | Communications Solutions
Segment and Geographic Data
Net sales	222	241	448	495
Total Americas
Segment and Geographic Data
Net sales	1,016	1,066	1,974	2,069
Total Americas | Transportation Solutions
Segment and Geographic Data
Net sales	460	473	884	939
Total Americas | Industrial Solutions
Segment and Geographic Data
Net sales	463	470	905	893
Total Americas | Communications Solutions
Segment and Geographic Data
Net sales	$ 93	$ 123	$ 185	$ 237