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Segment Information - Additional Information (Detail) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2017 Segment Business | Sep. 30, 2017 Segment | Jun. 30, 2017 Segment
Segment Reporting Information [Line Items] |  |  |
Number of primary businesses | Business | 2 |  |
Number of reportable segments | 5 |  |
Building Technologies & Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of reportable segments |  | 4 | 5

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- Definition Number of primary businesses. + References No definition available. + Details
Name: | jci_NumberOfPrimaryBusinesses
Namespace Prefix: | jci_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- 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

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- 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

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- Details
Name: | jci_PrimaryBusinessInformationByPrimaryBusinessAxis=jci_BuildingTechnologiesSolutionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |