DESCRIPTION OF THE PLAN (Details) - EBP 026	12 Months Ended
Dec. 31, 2025 USD ($) loan
EBP, Description of Plan [Line Items]
Participant contribution, maximum contribution to gross annual eligible compensation, percentage	35.00%
Participant contribution, reallocation of investment funds, increment percentage	1.00%
Participant auto enrolled in plan after eligibility is met, period	60 days
Forfeited nonvested, participant reemployment from termination date, period	72 months
Participant minimum borrowing amount	$ 500
Participant maximum borrowing amount	$ 50,000
Participant maximum borrowing, to total account, percentage	50.00%
Number of participant loans outstanding at any given time \| loan	2
Participant maximum borrowing term	5 years
Minimum
EBP, Description of Plan [Line Items]
Participant loan, interest rate	3.25%
Maximum
EBP, Description of Plan [Line Items]
Participant loan, interest rate	10.50%

EBP, Forfeited Nonvested Portion, Participant Reemployment From Termination Date, Period

No definition available.

Name:	jci_EBPForfeitedNonvestedPortionParticipantReemploymentFromTerminationDatePeriod
Namespace Prefix:	jci_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Note Receivable From Participant, Maximum Borrowing Term

+ References

No definition available.

+ Details

Name:	jci_EBPNoteReceivableFromParticipantMaximumBorrowingTerm
Namespace Prefix:	jci_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Note Receivable From Participant, Number Of Loans Outstanding At Any Given Time

+ References

No definition available.

+ Details

Name:	jci_EBPNoteReceivableFromParticipantNumberOfLoansOutstandingAtAnyGivenTime
Namespace Prefix:	jci_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Participant Auto Enrolled In Plan After Eligibility Is Met, Period

+ References

No definition available.

+ Details

Name:	jci_EBPParticipantAutoEnrolledInPlanAfterEligibilityIsMetPeriod
Namespace Prefix:	jci_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Participant Contribution, Maximum Contribution To Gross Annual Eligible Compensation, Percentage

+ References

No definition available.

+ Details

Name:	jci_EBPParticipantContributionMaximumContributionToGrossAnnualEligibleCompensationPercentage
Namespace Prefix:	jci_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Participant Contribution, Reallocation Of Investment Funds, Increment Percentage

+ References

No definition available.

+ Details

Name:	jci_EBPParticipantContributionReallocationOfInvestmentFundsIncrementPercentage
Namespace Prefix:	jci_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- 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 962
-SubTopic 205
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478416/962-205-50-1

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems
Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of maximum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478873/962-325-55-17

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingAmount
Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Percentage of maximum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow to total participant account balance.

+ References

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingToTotalAccountPercentage
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of minimum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow.

+ References

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMinimumBorrowingAmount
Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Interest rate on participant loan in schedule of asset held for investment of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 10
-Paragraph b
-Subparagraph (1)(i)(D)
-Publisher DOL-EBSA

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-05(a)(Schedule I))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanParticipantLoanInterestRate
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	dei_LegalEntityAxis=jci_EBP026Member
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:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: