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Earnings Per Share (Details)	3 Months Ended		12 Months Ended
	Sep. 30, 2018 $ / shares	Sep. 30, 2017 $ / shares	Sep. 30, 2018 Quarter $ / shares	Sep. 30, 2017 Quarter $ / shares	Sep. 30, 2016 $ / shares
Earnings Per Share [Abstract]
Cash dividends common, per share | $ / shares	$ 0.26	$ 0.25	$ 1.04	$ 1.00	$ 1.16
Number of quarterly dividends declared | Quarter			4	4

X

- Definition

Number of quarterly dividends declared.

+ References

No definition available.

+ Details

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Namespace Prefix:	jci_
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Period Type:	duration

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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