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Basis of Presentation - Number of borrowing groups (Details)	9 Months Ended
	Sep. 30, 2017 item
Basis of Presentation
Number of borrowing groups	2

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- Definition

Number of borrowing groups.

+ References

No definition available.

+ Details

Name:	txt_NumberOfBorrowingGroups
Namespace Prefix:	txt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration