Summary of Significant Accounting Policies - Finance Revenues (Details)	12 Months Ended
Jan. 04, 2020
Minimum \| Nonaccrual
Revenue Recognition
Number of months of contractual delinquency to classify accounts as nonaccrual unless such collection is not doubtful	3 months

Represents the maximum number of months of contractual delinquency to classify accounts as nonaccrual unless such collection is not doubtful.

No definition available.

Name:	txt_NumberOfMonthsOfContractualDelinquencyForAutomaticClassificationAsNonaccrualAccount
Namespace Prefix:	txt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration