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New Accounting Standards Recently Adopted Accounting Pronouncements (Details) $ in Millions | 3 Months Ended
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Dec. 31, 2017 USD ($)
Accounting Policies [Abstract] |
Deferred tax asset from stock options exercised and restricted stock vestings | $ 179

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- Definition Deferred tax asset from stock options exercised and restricted stock vestings on a modified retrospective basis through a cumulative-effect adjustment to retained earnings. + References No definition available. + Details
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Namespace Prefix: | jci_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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