Other Assets (Details) $ in Millions	3 Months Ended
Apr. 04, 2020 USD ($)
Other Assets
Proceeds from borrowings against corporate-owned life insurance policies	$ 377

The net cash inflow from borrowings against corporate life insurance policies.

No definition available.

Name:	txt_ProceedsFromBorrowingsAgainstCorporateOwnedLifeInsurance
Namespace Prefix:	txt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration