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Guarantees - Additional Information (Detail) | 3 Months Ended
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Dec. 31, 2019
Guarantor Obligations [Line Items] |
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

X
- Definition Maximum length, in years, of a product warranty for it to be recorded in other current liabilities. + References No definition available. + Details
Name: | jci_MaximumLengthInYearsOfProductWarrantyForItToBeRecordedInOtherCurrentLiabilities
Namespace Prefix: | jci_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum length, in years, of a product warranty for it to be recorded in other noncurrent liabilities. + References No definition available. + Details
Name: | jci_MinimumLengthInYearsOfProductWarrantyForItToBeRecordedInOtherNoncurrentLiabilities
Namespace Prefix: | jci_
Data Type: | xbrli:durationItemType
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_GuaranteeObligationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration