Document and Entity Information $ in Billions	12 Months Ended
	Sep. 30, 2016 USD ($) shares
Document Documentand Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Sep. 30, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	FY
Entity Registrant Name	JOHNSON CONTROLS INC
Entity Central Index Key	0000053669
Current Fiscal Year End Date	--09-30
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding | shares	0
Entity Public Float | $	$ 0.0