Restructuring and Other Charges, Net - Restructuring Reserve Activity (Details) $ in Millions	9 Months Ended
Jun. 27, 2025 USD ($)
Restructuring reserve
Restructuring reserve at the beginning of the period	$ 273
Charges	$ 103
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]	Restructuring and Asset Impairment Charges (Credits) and Disposal Group Not Discontinued Operation Loss (Gain) on Disposal
Changes in Estimate	$ (6)
Cash Payments	(149)
Non-Cash Items	(7)
Currency Translation and Other	3
Restructuring reserve at the end of the period	217
Fiscal 2025 Actions
Restructuring reserve
Charges	80
Cash Payments	(15)
Non-Cash Items	(3)
Currency Translation and Other	5
Restructuring reserve at the end of the period	67
Fiscal 2025 Actions \| Employee severance
Restructuring reserve
Charges	77
Cash Payments	(15)
Currency Translation and Other	5
Restructuring reserve at the end of the period	67
Fiscal 2025 Actions \| Property, plant, and equipment
Restructuring reserve
Charges	3
Non-Cash Items	(3)
Fiscal 2024 Actions
Restructuring reserve
Restructuring reserve at the beginning of the period	72
Charges	3
Cash Payments	(35)
Non-Cash Items	(3)
Currency Translation and Other	1
Restructuring reserve at the end of the period	38
Fiscal 2024 Actions \| Employee severance
Restructuring reserve
Restructuring reserve at the beginning of the period	72
Charges	2
Changes in Estimate	(2)
Cash Payments	(35)
Currency Translation and Other	1
Restructuring reserve at the end of the period	38
Fiscal 2024 Actions \| Property, plant, and equipment
Restructuring reserve
Charges	1
Changes in Estimate	2
Non-Cash Items	(3)
Pre-Fiscal 2024 Actions
Restructuring reserve
Restructuring reserve at the beginning of the period	201
Charges	20
Changes in Estimate	(6)
Cash Payments	(99)
Non-Cash Items	(1)
Currency Translation and Other	(3)
Restructuring reserve at the end of the period	112
Pre-Fiscal 2024 Actions \| Employee severance
Restructuring reserve
Restructuring reserve at the beginning of the period	186
Charges	11
Changes in Estimate	(6)
Cash Payments	(85)
Currency Translation and Other	(3)
Restructuring reserve at the end of the period	103
Pre-Fiscal 2024 Actions \| Facility and other exit costs
Restructuring reserve
Restructuring reserve at the beginning of the period	15
Charges	8
Cash Payments	(14)
Restructuring reserve at the end of the period	9
Pre-Fiscal 2024 Actions \| Property, plant, and equipment
Restructuring reserve
Charges	1
Non-Cash Items	$ (1)

Amount of decrease or (increase) in the reserve for full or partial settlement through consideration other than cash.

No definition available.

Name:	tel_RestructuringReserveSettledWithoutCashNet2
Namespace Prefix:	tel_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482017/420-10-50-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 17
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-17

+ Details

Name:	us-gaap_PaymentsForRestructuring
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4.d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4.b.1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482017/420-10-50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482017/420-10-50-1

+ Details

Name:	us-gaap_RestructuringAndRelatedCostIncurredCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Indicates line item in statement of income or comprehensive income that includes restructuring charges.

+ References

Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4.c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2

Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482017/420-10-50-1

+ Details

Name:	us-gaap_RestructuringIncurredCostStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration
Namespace Prefix:	us-gaap_
Data Type:	enum2:enumerationSetItemType
Balance Type:	na
Period Type:	duration

- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

+ Details

Name:	us-gaap_RestructuringReserve
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability.

+ References

+ Details

Name:	us-gaap_RestructuringReserveAccrualAdjustment1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

Name:	us-gaap_RestructuringReserveRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of increase (decrease) in the restructuring reserve related to foreign currency translation (gain) loss and other increases (decreases).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4.b.2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482017/420-10-50-1

+ Details

Name:	us-gaap_RestructuringReserveTranslationAndOtherAdjustment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_RestructuringPlanAxis=tel_Fiscal2025ActionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=us-gaap_EmployeeSeveranceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=us-gaap_PropertyPlantAndEquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringPlanAxis=tel_Fiscal2024ActionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringPlanAxis=tel_PreFiscal2024ActionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=us-gaap_FacilityClosingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: