Accounts Receivable and Finance Receivables - Finance Receivable Portfolio Quality (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 29, 2024	Dec. 30, 2023
Finance Receivable Portfolio Quality
Finance receivables	$ 605	$ 609
60+ days contractual delinquency as a percentage of finance receivables	0.50%	0.66%
Current and less than 31 days past due
Finance Receivable Portfolio Quality
Finance receivables	$ 587	$ 589
31-60 days past due
Finance Receivable Portfolio Quality
Finance receivables	15	16
61-90 days past due
Finance Receivable Portfolio Quality
Finance receivables	2	0
Over 90 days past due
Finance Receivable Portfolio Quality
Finance receivables	$ 1	$ 4
Performing
Finance Receivable Portfolio Quality
Financing percentage receivable originating since the beginning of 2022	38.00%
Financing receivable percentage originating from 2019 to 2021	28.00%
Nonperforming
Finance Receivable Portfolio Quality
Nonaccrual as a percentage of finance receivables	2.31%	2.46%
Nonperforming \| Watchlist
Finance Receivable Portfolio Quality
Finance receivables	$ 21	$ 23
Financing receivable percentage originating from 2020 to 2021	100.00%
Nonperforming \| Nonaccrual
Finance Receivable Portfolio Quality
Finance receivables	$ 14	15
Financing receivable percentage originating prior to 2020	100.00%
Nonperforming \| Minimum
Finance Receivable Portfolio Quality
Number of months of contractual delinquency to classify accounts as nonaccrual unless such collection is not doubtful	3 months
Performing
Finance Receivable Portfolio Quality
Finance receivables	$ 570	$ 571

Financing Receivable, Percentage, Originated Current Fiscal Year to Two Years Before Current Fiscal Year

No definition available.

Name:	txt_FinancingReceivablePercentageOriginatedCurrentFiscalYearToTwoYearsBeforeCurrentFiscalYear
Namespace Prefix:	txt_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Financing Receivable, Percentage, Originated More Than Four Years Before Current Fiscal Year

+ References

No definition available.

+ Details

Name:	txt_FinancingReceivablePercentageOriginatedMoreThanFourYearsBeforeCurrentFiscalYear
Namespace Prefix:	txt_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Financing Receivable, Percentage, Originated Three To Four Years Before Current Fiscal Year

+ References

No definition available.

+ Details

Name:	txt_FinancingReceivablePercentageOriginatedThreeToFourYearsBeforeCurrentFiscalYear
Namespace Prefix:	txt_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Financing Receivable, Percentage, Originated Three Years To Five Years Before Current Fiscal Year

+ References

No definition available.

+ Details

Name:	txt_FinancingReceivablePercentageOriginatedThreeYearsToFiveYearsBeforeCurrentFiscalYear
Namespace Prefix:	txt_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

- 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

- Definition

Percentage of Loans, Sixty Plus Days, Past Due, To Total Loans

+ References

No definition available.

+ Details

Name:	txt_PercentageOfLoansSixtyPlusDaysPastDueToTotalLoans
Namespace Prefix:	txt_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of nonaccrual financing receivable balance outstanding that is past due.

+ References

+ Details

Name:	us-gaap_FinancingReceivableNonaccrualPercentPastDue1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-14

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 80
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479294/326-20-55-80

+ Details

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

- Definition

Amortized cost, before allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-13

Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-7A

Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 29
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-29

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph a
-Subparagraph (1)
-Publisher SEC

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph a
-Subparagraph (2)
-Publisher SEC

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Regulation S-K (SK)
-Number 229
-Section 1404
-Paragraph a
-Publisher SEC

Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 80
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479294/326-20-55-80

Reference 8: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479294/326-20-55-79

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-14

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-5

+ Details

Name:	us-gaap_NotesReceivableGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=txt_FinancialAssetsCurrentAndLessThan31DaysPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=txt_FinancialAssets31To60DaysPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=txt_FinancialAssets61To90DaysPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_FinancialInstrumentPerformanceStatusAxis=us-gaap_NonperformingFinancingReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_DoubtfulMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_FinancialInstrumentPerformanceStatusAxis=us-gaap_PerformingFinancingReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: