Tyco Electronics Group S.A. - Operations (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 28, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 29, 2017	Sep. 27, 2019	Sep. 28, 2018	Sep. 29, 2017
Statement of Operations Detail:
Net sales	$ 3,300	$ 3,389	$ 3,412	$ 3,347	$ 3,509	$ 3,581	$ 3,562	$ 3,336	$ 13,448	$ 13,988	$ 12,185
Cost of sales									9,054	9,243	8,002
Gross margin	1,052	1,110	1,118	1,114	1,182	1,187	1,212	1,164	4,394	4,745	4,183
Selling, general, and administrative expenses, net									1,490	1,594	1,543
Research, development, and engineering expenses									644	680	611
Acquisition and integration costs	6	9	7	5	5	4	3	2	27	14	6
Restructuring and other charges, net	71	67	42	75	22	64	6	34	255	126	147
Operating income									1,978	2,331	1,876
Interest income									19	15	16
Interest expense									(68)	(107)	(130)
Other income (expense), net									2	1	(42)
Income from continuing operations before income taxes									1,931	2,240	1,720
Income tax (expense) benefit									15	344	(180)
Income from continuing operations	376	758	429	383	1,674	453	490	(33)	1,946	2,584	1,540
Income (loss) from discontinued operations, net of income taxes	(4)	(1)	10	(107)	(13)	1		(7)	(102)	(19)	143
Net income	$ 372	$ 757	$ 439	$ 276	$ 1,661	$ 454	$ 490	$ (40)	1,844	2,565	1,683
Other comprehensive income (loss)									(197)	(108)	382
Comprehensive income									1,647	2,457	2,065
Consolidating Adjustments
Statement of Operations Detail:
Equity in net income of subsidiaries									(4,481)	(5,649)	(5,442)
Equity in net income (loss) of subsidiaries of discontinued operations									154	38	(299)
Income from continuing operations before income taxes									(4,327)	(5,611)	(5,741)
Income from continuing operations									(4,327)	(5,611)	(5,741)
Net income									(4,327)	(5,611)	(5,741)
Other comprehensive income (loss)									487	190	(757)
Comprehensive income									(3,840)	(5,421)	(6,498)
TE Connectivity Ltd. | Reportable entities
Statement of Operations Detail:
Selling, general, and administrative expenses, net									128	154	184
Operating income									(128)	(154)	(184)
Equity in net income of subsidiaries									2,194	2,808	1,756
Equity in net income (loss) of subsidiaries of discontinued operations									(102)	(19)	143
Intercompany interest income (expense), net									(120)	(70)	(32)
Income from continuing operations before income taxes									1,844	2,565	1,683
Income from continuing operations									1,844	2,565	1,683
Net income									1,844	2,565	1,683
Other comprehensive income (loss)									(197)	(108)	382
Comprehensive income									1,647	2,457	2,065
TEGSA | Reportable entities
Statement of Operations Detail:
Selling, general, and administrative expenses, net									(155)	6	1,911
Operating income									155	(6)	(1,911)
Interest income									1	2
Interest expense									(64)	(105)	(129)
Other income (expense), net									1
Equity in net income of subsidiaries									2,287	2,841	3,686
Equity in net income (loss) of subsidiaries of discontinued operations									(52)	(19)	156
Intercompany interest income (expense), net									(186)	76	110
Income from continuing operations before income taxes									2,142	2,789	1,912
Income from continuing operations									2,142	2,789	1,912
Income (loss) from discontinued operations, net of income taxes									(50)		(13)
Net income									2,092	2,789	1,899
Other comprehensive income (loss)									(197)	(108)	382
Comprehensive income									1,895	2,681	2,281
Intercompany transaction gains (losses)									194		(1,965)
Other Subsidiaries | Reportable entities
Statement of Operations Detail:
Net sales									13,448	13,988	12,185
Cost of sales									9,054	9,243	8,002
Gross margin									4,394	4,745	4,183
Selling, general, and administrative expenses, net									1,517	1,434	(552)
Research, development, and engineering expenses									644	680	611
Acquisition and integration costs									27	14	6
Restructuring and other charges, net									255	126	147
Operating income									1,951	2,491	3,971
Interest income									18	13	16
Interest expense									(4)	(2)	(1)
Other income (expense), net									1	1	(42)
Intercompany interest income (expense), net									306	(6)	(78)
Income from continuing operations before income taxes									2,272	2,497	3,866
Income tax (expense) benefit									15	344	(180)
Income from continuing operations									2,287	2,841	3,686
Income (loss) from discontinued operations, net of income taxes									(52)	(19)	156
Net income									2,235	2,822	3,842
Other comprehensive income (loss)									(290)	(82)	375
Comprehensive income									$ 1,945	$ 2,740	$ 4,217