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Summary of Significant Accounting Policies Variable Interest Entities, Additional Information (Details) | Sep. 30, 2019
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Variable Interest Entity [Line Items] |
Interest Percentage Minimum For Investments In Partially Owned Affiliates To Be Accounted For By Equity Method | 20.00%

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- Definition Interest percentage minimum for investments in partially-owned affiliates to be accounted for by the equity method. + References No definition available. + Details
Name: | jci_InterestPercentageMinimumForInvestmentsInPartiallyOwnedAffiliatesToBeAccountedForByEquityMethod
Namespace Prefix: | jci_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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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_VariableInterestEntityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration