Product Warranties - Additional Information (Detail)	6 Months Ended
Mar. 31, 2015
Product Warranties Disclosures [Abstract]
Maximum length, in years, of a product warranty for it to be recorded in other current liabilities	1 year
Minimum length, in years, of a product warranty for it to be recorded in other noncurrent liabilities	1 year

Minimum length, in years, of a product warranty for it to be recorded in other noncurrent liabilities.

No definition available.

Name:	jci_MinimumLengthInYearsOfProductWarrantyForItToBeRecordedInOtherNoncurrentLiabilities
Namespace Prefix:	jci_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration