Segment and Geographic Data - Net Sales by Segment and Industry End Market (Details) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 27, 2019 USD ($)	Jun. 28, 2019 USD ($)	Mar. 29, 2019 USD ($)	Dec. 28, 2018 USD ($)	Sep. 28, 2018 USD ($)	Jun. 29, 2018 USD ($)	Mar. 30, 2018 USD ($)	Dec. 29, 2017 USD ($)	Sep. 27, 2019 USD ($) segment	Sep. 28, 2018 USD ($)	Sep. 29, 2017 USD ($)
Segment and Geographic Data
Number of reportable segments | segment									3
Net sales	$ 3,300	$ 3,389	$ 3,412	$ 3,347	$ 3,509	$ 3,581	$ 3,562	$ 3,336	$ 13,448	$ 13,988	$ 12,185
Total Europe/Middle East/Africa
Segment and Geographic Data
Net sales									4,823	5,255	4,399
Total Asia-Pacific
Segment and Geographic Data
Net sales									4,401	4,762	4,312
Total Americas
Segment and Geographic Data
Net sales									4,224	3,971	3,474
Transportation Solutions
Segment and Geographic Data
Net sales									7,821	8,290	7,039
Transportation Solutions | Total Europe/Middle East/Africa
Segment and Geographic Data
Net sales									3,099	3,417	2,786
Transportation Solutions | Total Asia-Pacific
Segment and Geographic Data
Net sales									2,812	3,025	2,715
Transportation Solutions | Total Americas
Segment and Geographic Data
Net sales									1,910	1,848	1,538
Transportation Solutions | Automotive
Segment and Geographic Data
Net sales									5,686	6,092	5,228
Transportation Solutions | Commercial transportation
Segment and Geographic Data
Net sales									1,221	1,280	997
Transportation Solutions | Sensors
Segment and Geographic Data
Net sales									914	918	814
Industrial Solutions
Segment and Geographic Data
Net sales									3,954	3,856	3,507
Industrial Solutions | Total Europe/Middle East/Africa
Segment and Geographic Data
Net sales									1,466	1,534	1,354
Industrial Solutions | Total Asia-Pacific
Segment and Geographic Data
Net sales									625	668	634
Industrial Solutions | Total Americas
Segment and Geographic Data
Net sales									1,863	1,654	1,519
Industrial Solutions | Industrial equipment
Segment and Geographic Data
Net sales									1,949	1,987	1,747
Industrial Solutions | Aerospace, defense, oil, and gas
Segment and Geographic Data
Net sales									1,306	1,157	1,075
Industrial Solutions | Energy
Segment and Geographic Data
Net sales									699	712	685
Communications Solutions
Segment and Geographic Data
Net sales									1,673	1,842	1,639
Communications Solutions | Total Europe/Middle East/Africa
Segment and Geographic Data
Net sales									258	304	259
Communications Solutions | Total Asia-Pacific
Segment and Geographic Data
Net sales									964	1,069	963
Communications Solutions | Total Americas
Segment and Geographic Data
Net sales									451	469	417
Communications Solutions | Data and devices
Segment and Geographic Data
Net sales									993	1,068	963
Communications Solutions | Appliances
Segment and Geographic Data
Net sales									$ 680	$ 774	$ 676