Commitments and Contingencies - Letter of Credit (Details) - USD ($) $ in Millions	Jan. 01, 2022	Jan. 02, 2021
Commitments and Contingencies Disclosure [Abstract]
Aggregate amount of outstanding letter of credit arrangements and surety bonds	$ 213	$ 216

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