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Nonconsolidated Partially-Owned Affiliates (Detail)	12 Months Ended
	Sep. 30, 2019
Equity Method Investments and Joint Ventures [Abstract]
Percentage of results of operations	100.00%

X

- Definition

Percentage Of Consolidated Operating Results Of Non Consolidated Partially Owned Affiliates

+ References

No definition available.

+ Details

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Namespace Prefix:	jci_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_EquityMethodInvestmentsAndJointVenturesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration