Commitments and Contingencies - Letter of Credit (Details) - USD ($) $ in Millions	Jan. 03, 2026	Dec. 28, 2024
Commitments and Contingencies Disclosure [Abstract]
Aggregate amount of outstanding letter of credit arrangements and surety bonds	$ 380	$ 336

Letters of Credit and Surety Bonds Outstanding, Amount

No definition available.

Name:	txt_LettersOfCreditAndSuretyBondsOutstandingAmount
Namespace Prefix:	txt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant