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v3.19.3

Segment Information (Details) | 12 Months Ended
--- | ---
Sep. 30, 2019 Person Segment | Sep. 30, 2018 Person
Segment Reporting Information [Line Items] |  |
Number of reportable segments | Segment | 4 |
Percentage of individual customer sales to consolidated net sales threshold for disclosure as major customer | 10.00% | 10.00%
Number of customers that individually accounted for 10 % or more of consolidated net sales | Person | 0 | 0

X
- Definition Number of customers that individually accounted for 10% or more of consolidated net sales. + References No definition available. + Details
Name: | jci_NumberOfCustomersThatIndividuallyAccountedForTenPercentOrMoreOfConsolidatedNetSales
Namespace Prefix: | jci_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of individual customer sales to consolidated net sales, threshold for disclosure as major customer. + References No definition available. + Details
Name: | jci_PercentageOfIndividualCustomerSalesToConsolidatedNetSalesThresholdForDisclosureAsMajorCustomer
Namespace Prefix: | jci_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration