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Significant Restructuring Costs - Additional Information (Detail) - 2021 Restructuring Plan | 12 Months Ended
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Dec. 31, 2021 Employees
Restructuring Cost and Reserve [Line Items] |
Number of employees to be severed | 4,000
Number of employees severed | 1,800

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- Definition The expected number of positions to be eliminated as a result of restructuring activities. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of positions eliminated as of the balance sheet date since inception of the restructuring plan(s). + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
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Period Type: | instant

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- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RestructuringPlanAxis=jci_A2021RestructuringPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |