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Amounts in Accumulated Other Comprehensive Income, Exclusive of Tax Impacts, that have not yet been Recognized as Components of Net Periodic Benefit Costs (Details) | 12 Months Ended
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Sep. 30, 2019
Retirement Plans [Line Items] |
Document Period End Date | Sep. 30, 2019

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
Name: | dei_DocumentPeriodEndDate
Namespace Prefix: | dei_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Retirement Plans [Line Items] + References No definition available. + Details
Name: | jci_RetirementPlansLineItems
Namespace Prefix: | jci_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration