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Accounts Receivable - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021
Receivables [Abstract] |  |
Accounts receivable, sale | $ 1,115 | $ 129
Outstanding receivables sold under factoring agreements | $ 476 | $ 127

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- Definition Outstanding Receivables Sold under Factoring Agreements + References No definition available. + Details
Name: | jci_OutstandingReceivablesSoldUnderFactoringAgreements
Namespace Prefix: | jci_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of decrease from sale of accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 11 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919244-210447 + Details
Name: | us-gaap_AccountsReceivableSale
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration