Restructuring and Other Charges, Net - Restructuring Reserve Activity (Details) $ in Millions	3 Months Ended
Dec. 27, 2024 USD ($)
Restructuring reserve
Restructuring reserve at the beginning of the period	$ 273
Charges	43
Cash Payments	(42)
Non-Cash Items	(6)
Currency Translation	(14)
Restructuring reserve at the end of the period	254
Fiscal 2025 Actions
Restructuring reserve
Charges	30
Non-Cash Items	(3)
Restructuring reserve at the end of the period	27
Fiscal 2025 Actions \| Employee severance
Restructuring reserve
Charges	27
Restructuring reserve at the end of the period	27
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	2
Changes in Estimate	2
Cash Payments	(11)
Non-Cash Items	(2)
Currency Translation	(4)
Restructuring reserve at the end of the period	59
Fiscal 2024 Actions \| Employee severance
Restructuring reserve
Restructuring reserve at the beginning of the period	72
Charges	2
Cash Payments	(11)
Currency Translation	(4)
Restructuring reserve at the end of the period	59
Fiscal 2024 Actions \| Property, plant, and equipment
Restructuring reserve
Changes in Estimate	2
Non-Cash Items	(2)
Pre-Fiscal 2024 Actions
Restructuring reserve
Restructuring reserve at the beginning of the period	201
Charges	11
Changes in Estimate	(2)
Cash Payments	(31)
Non-Cash Items	(1)
Currency Translation	(10)
Restructuring reserve at the end of the period	168
Pre-Fiscal 2024 Actions \| Employee severance
Restructuring reserve
Restructuring reserve at the beginning of the period	186
Charges	9
Changes in Estimate	(2)
Cash Payments	(26)
Currency Translation	(9)
Restructuring reserve at the end of the period	158
Pre-Fiscal 2024 Actions \| Facility and other exit costs
Restructuring reserve
Restructuring reserve at the beginning of the period	15
Charges	1
Cash Payments	(5)
Currency Translation	(1)
Restructuring reserve at the end of the period	10
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.

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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

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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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

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

- Definition

Amount of foreign currency translation gain (loss) which decreases (increases) the restructuring reserve.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-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

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

- Details

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- Details

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- Details

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Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringPlanAxis=tel_Fiscal2024ActionsMember
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Balance Type:
Period Type:

- Details

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

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: