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Segment Information (Details)	12 Months Ended
	Sep. 30, 2018 Person Segment	Sep. 30, 2017 Person
Segment Reporting Information [Line Items]
Number of reportable segments	5
Number of primary businesses	2
Percentage of individual customer sales to consolidated net sales threshold for disclosure as major customer	10.00%	10.00%
Number of customers that individually accounted for 10 % or more of consolidated net sales | Person	0	0

X

- Definition

Number of customers that individually accounted for 10% or more of consolidated net sales.

+ References

No definition available.

+ Details

Name:	jci_NumberOfCustomersThatIndividuallyAccountedForTenPercentOrMoreOfConsolidatedNetSales
Namespace Prefix:	jci_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- Definition

Percentage of individual customer sales to consolidated net sales, threshold for disclosure as major customer.

+ References

No definition available.

+ Details

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

X

- 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

X

- 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