Restructuring and Other Charges, Net - Restructuring Reserve Activity (Details) $ in Millions	9 Months Ended
Jun. 26, 2026 USD ($)
Restructuring reserve
Restructuring reserve at the beginning of the period	$ 177
Charges	96
Cash Payments	(78)
Non-Cash Items	(4)
Currency Translation	(4)
Restructuring reserve at the end of the period	187
Fiscal 2026 Actions
Restructuring reserve
Charges	86
Cash Payments	(3)
Non-Cash Items	(3)
Currency Translation	(1)
Restructuring reserve at the end of the period	79
Fiscal 2026 Actions \| Employee severance
Restructuring reserve
Charges	81
Cash Payments	(1)
Currency Translation	(1)
Restructuring reserve at the end of the period	79
Fiscal 2026 Actions \| Facility and other exit costs
Restructuring reserve
Charges	2
Cash Payments	(2)
Fiscal 2026 Actions \| Property, plant, and equipment
Restructuring reserve
Charges	3
Non-Cash Items	(3)
Fiscal 2025 Actions
Restructuring reserve
Restructuring reserve at the beginning of the period	75
Charges	1
Changes in Estimate	(3)
Cash Payments	(30)
Currency Translation	(2)
Restructuring reserve at the end of the period	41
Fiscal 2025 Actions \| Employee severance
Restructuring reserve
Restructuring reserve at the beginning of the period	75
Changes in Estimate	(3)
Cash Payments	(29)
Currency Translation	(2)
Restructuring reserve at the end of the period	41
Fiscal 2025 Actions \| Facility and other exit costs
Restructuring reserve
Charges	1
Cash Payments	(1)
Pre-Fiscal 2025 Actions
Restructuring reserve
Restructuring reserve at the beginning of the period	102
Charges	9
Changes in Estimate	3
Cash Payments	(45)
Non-Cash Items	(1)
Currency Translation	(1)
Restructuring reserve at the end of the period	67
Pre-Fiscal 2025 Actions \| Employee severance
Restructuring reserve
Restructuring reserve at the beginning of the period	98
Charges	9
Changes in Estimate	2
Cash Payments	(41)
Currency Translation	(1)
Restructuring reserve at the end of the period	67
Pre-Fiscal 2025 Actions \| Facility and other exit costs
Restructuring reserve
Restructuring reserve at the beginning of the period	4
Cash Payments	(4)
Pre-Fiscal 2025 Actions \| Property, plant, and equipment
Restructuring reserve
Changes in Estimate	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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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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Balance Type:	credit
Period Type:	duration

- Details

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- Details

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- Details

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- Details

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Balance Type:
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- Details

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- Details

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