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Accounts Receivable and Finance Receivables - Finance receivables (Details) - USD ($) $ in Millions | Sep. 29, 2018 | Dec. 30, 2017
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Finance Receivables |  |
Finance receivables, gross | $ 815 | $ 850
Allowance for losses | (29) | (31)
Total finance receivables, net | $ 786 | $ 819

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- Definition The carrying amount of finance receivables held for investment or sale. + References No definition available. + Details
Name: | txt_FinanceReceivablesGross
Namespace Prefix: | txt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The carrying amount of financing receivables, net of the allowance for losses. + References No definition available. + Details
Name: | txt_FinanceReceivablesNet
Namespace Prefix: | txt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_NotesReceivableNetAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration