Income Taxes - Other Income Tax Matters (Details) $ in Millions	12 Months Ended
Sep. 25, 2020 USD ($)
Income Taxes
Income tax expense related to tax impacts of Swiss Tax Reform	$ 355
Income tax benefit related to pre-separation tax matters and termination of the tax sharing agreement	31
Net other income related to pre-separation tax matters and the termination of the tax sharing agreement	$ 8

Net other nonoperating (income) expense related to pre-separation tax matters and the termination of the Tax Sharing Agreement (TSA).

No definition available.

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