Debt instrument description of variable rate basis after specified term at fixed rate.

No definition available.

Name:	txt_DebtInstrumentDescriptionOfVariableRateBasisAfterSpecifiedTermAtFixedRate
Namespace Prefix:	txt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt instrument initial fixed rate duration description.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt instrument initial fixed rate during specified term.

+ References

No definition available.

+ Details

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Namespace Prefix:	txt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt instrument spread on variable rate after specified term at fixed rate.

+ References

No definition available.

+ Details

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Namespace Prefix:	txt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Letters of credit issued against credit facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	txt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Period of extensions given for the line of credit facility.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Represents the number of one-year extensions under the line of credit facility.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility that the entity may elect increase to its current credit facility by designating additional lender or by existing lender agree to increase its commitment.

+ References

No definition available.

+ Details

Name:	txt_LineOfCreditFacilityPotentialMaximumBorrowingCapacity
Namespace Prefix:	txt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Minimum fixed charge coverage required to be maintained by subsidiary under Support Agreement with Company.

+ References

No definition available.

+ Details

Name:	txt_MinimumFixedChargeCoverageRequiredToBeMaintainedBySubsidiary
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Minimum shareholder's equity required to be maintained by subsidiary under Support Agreement with Company.

+ References

No definition available.

+ Details

Name:	txt_MinimumShareholdersEquityRequiredToBeMaintainedBySubsidiary
Namespace Prefix:	txt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Latest date before maturity which the issuer can call the outstanding debt instrument for repayment or conversion to equity, in CCYY-MM-DD format.

+ References

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-Publisher FASB
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+ Details

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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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Data Type:	num: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

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Subparagraph (SX 210.5-02.22(a)(2))
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+ Details

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Balance Type:	na
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for a specific purpose other than for financing goods acquired for inventory or imminent delivery to a customer.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow from parent as a source of financing that is recorded as additional paid in capital.

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Period Type:	duration

- Details

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- Details

Name:	srt_ConsolidatedEntitiesAxis=txt_SegmentFinanceGroupMember
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- Details

Name:	us-gaap_CreditFacilityAxis=txt_SeniorUnsecuredRevolvingCreditFacilityExpiresOctober2024Member
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- Details

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Debt and Credit Facilities - Other information (Details) $ in Millions		12 Months Ended
	Oct. 18, 2019 USD ($) item	Jan. 04, 2020 USD ($)	Dec. 29, 2018 USD ($)	Dec. 30, 2017 USD ($)
Debt
Minimum fixed charge coverage required to be maintained by TFC (as a percent)		125.00%
Minimum shareholder's equity required to be maintained by TFC		$ 125
Cash paid to TFC to maintain compliance with covenants		0	$ 0	$ 0
Fixed-to-Floating Rate Junior Subordinated Notes (3.64% and 4.35%, respectively) \| Finance group
Debt
Face value of the notes		$ 299
Interest rate (as a percent)		3.64%	4.35%
Debt Instrument, Maturity Date		Feb. 15, 2067
Debt Instrument call date latest		Feb. 15, 2042
Fixed interest rate on notes (as a percent)		6.00%
Debt instrument initial fixed rate duration description		February 15, 2017
Floating variable rate of debt instrument (as a percent)		1.735%
Debt instrument description of variable rate basis after specified term at fixed rate		three-month London Interbank Offered Rate
Senior Unsecured Revolving Credit Facility, Expiring October 2024
Debt
Maximum borrowing capacity	$ 1,000
Borrowing capacity Textron may elect to increase to	$ 1,300
Number of one-year extensions \| item	2
Extension period (in years)	1 year
Portion available for issuance of letters of credit against facility	$ 100
Amount borrowed against facility		$ 0
Letters of credit issued against credit facility		$ 10
Senior Unsecured Revolving Credit Facility, Expiring September 2021
Debt
Amount borrowed against facility			$ 0
Letters of credit issued against credit facility			$ 10
Expiration period of existing facility (in years)	5 years