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Basis of Presentation (Details) $ in Millions | 9 Months Ended
--- | ---
Sep. 29, 2018 USD ($) item | Sep. 30, 2017 USD ($)
Net proceeds from corporate-owned life insurance policies | $ 98 | $ 20
Number of borrowing groups | item | 2 |
ASU 2016-15 |  |
Net proceeds from corporate-owned life insurance policies |  | 20
Net proceeds from corporate-owned life insurance policies reclassified from operating activities |  | $ (20)

X
- Definition Amount of net cash inflow for proceeds from settlement of corporate-owned life insurance policy reclassified from operating activities. + References No definition available. + Details
Name: | txt_NetProceedsFromLifeInsurancePoliciesReclassifiedFromOperatingActivities
Namespace Prefix: | txt_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of net cash inflow for proceeds from settlement of corporate-owned life insurance policy, net of premiums paid classified as investing activities. Includes, but is not limited to, bank-owned life insurance policy. + References No definition available. + Details
Name: | txt_NetProceedsFromLifeInsurancePolicy
Namespace Prefix: | txt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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
- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201615Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |