Summary of Significant Accounting Policies - Goodwill and Intangible Assets (Details)	12 Months Ended
Jan. 04, 2020
Goodwill and Intangible Assets
Gross intangible assets amortized based on the cash flow streams	85.00%

Percentage of gross intangible assets being amortized using cash flow streams that were used to value the assets.

No definition available.

Name:	txt_PercentageOfGrossIntangibleAssetsAmortizedUsingCashFlowStreamsUsedToValueTheAssets
Namespace Prefix:	txt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration