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Accounts Receivable and Finance Receivables - Finance receivables categorized based on credit quality indicators (Details) $ in Millions | 9 Months Ended |
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Sep. 29, 2018 USD ($) item | Dec. 30, 2017 USD ($)
Finance receivables categorized based on the internally assigned credit quality |  |
Number of loan categories based on key credit quality indicators for individual loan | item | 3 |
Performing |  |
Finance receivables categorized based on the internally assigned credit quality |  |
Total finance receivables | $ 723 | $ 733
Watchlist |  |
Finance receivables categorized based on the internally assigned credit quality |  |
Total finance receivables | 48 | 56
Nonaccrual |  |
Finance receivables categorized based on the internally assigned credit quality |  |
Total finance receivables | $ 44 | $ 61
Nonaccrual as a percentage of finance receivables | 5.40% | 7.18%
Minimum | Nonaccrual |  |
Finance receivables categorized based on the internally assigned credit quality |  |
Number of months of contractual delinquency to classify accounts as nonaccrual unless such collection is not doubtful | 3 months |

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

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- Definition Finance receivables held for investment based on internally assigned credit quality abstract. + References No definition available. + Details
Name: | txt_FinanceReceivablesHeldForInvestmentBasedOnInternallyAssignedCreditQualityAbstract
Namespace Prefix: | txt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Finance receivables held for investment, percent. + References No definition available. + Details
Name: | txt_FinanceReceivablesHeldForInvestmentPercent
Namespace Prefix: | txt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents the number of loan categories based on key credit quality indicators for individual loan. These categories include performing, watchlist and nonaccrual. + References No definition available. + Details
Name: | txt_NumberOfLoanCategoriesBasedOnKeyCreditQualityIndicatorsForIndividualLoan
Namespace Prefix: | txt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the maximum number of months of contractual delinquency to classify accounts as nonaccrual unless such collection is not doubtful. + References No definition available. + Details
Name: | txt_NumberOfMonthsOfContractualDelinquencyForAutomaticClassificationAsNonaccrualAccount
Namespace Prefix: | txt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_PerformingFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SpecialMentionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_NonperformingFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |