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v3.10.0.1

Nonconsolidated Partially-Owned Affiliates (Detail) | 12 Months Ended
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Sep. 30, 2018
Equity Method Investments and Joint Ventures [Abstract] |
Percentage of results of operations | 100.00%

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- Definition Percentage Of Consolidated Operating Results Of Non Consolidated Partially Owned Affiliates + References No definition available. + Details
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Namespace Prefix: | jci_
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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