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Summary of Significant Accounting Policies Variable Interest Entities, Additional Information (Details) $ in Millions | 12 Months Ended
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Sep. 30, 2018 USD ($) Entity | Sep. 30, 2017 USD ($) Entity | Sep. 30, 2012 Entity
Variable Interest Entity [Line Items] |  |  |
Interest Percentage Minimum For Investments In Partially Owned Affiliates To Be Accounted For By Equity Method | 20.00% |  |
Number Of VIEs In Which Company Was Primary Beneficiary | Entity |  | 1 |
Number Of Separate Investments Pre Existing Variable Interest Entities Was Reorganized Into | Entity |  |  | 3
Additional Interests Acquired | Entity |  |  | 2
Amount Of Debt Co Obliged By Variable Interest Entity | $ | $ 155 |  |
Loans To Group Entities | $ | 38 |  |
Minimum Proceeds Received | $ | $ 25 |  |
Number Of Vies In Which Company Was Not Primary Beneficiary | 3 | 2 |
Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | $ | $ 43 | $ 65 |
Power Solutions |  |  |
Variable Interest Entity [Line Items] |  |  |
Number Of VIEs In Which Company Was Primary Beneficiary | Entity | 1 |  |

X
- Definition Number of reorganized investments in which the Company acquired additional interests. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

X
- Definition Amount of third party debt agreement in which the VIE is named as a co-obligor. + References No definition available. + Details
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Namespace Prefix: | jci_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Interest percentage minimum for investments in partially-owned affiliates to be accounted for by the equity method. + References No definition available. + Details
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X
- Definition Loans provided by the Company to partially-owned affiliates. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Minimum proceeds that the other owner party will receive upon sale or transfer of their ownership interest, as guaranteed by the Company. + References No definition available. + Details
Name: | jci_MinimumProceedsReceived
Namespace Prefix: | jci_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of separate investments a pre-existing VIE was reorganized into. + References No definition available. + Details
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Namespace Prefix: | jci_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of VIEs in which company was not primary beneficiary. + References No definition available. + Details
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Namespace Prefix: | jci_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of VIEs in which company was primary beneficiary. + References No definition available. + Details
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X
- Definition The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5728-111685 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5747-111685 + Details
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Period Type: | instant

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
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- Details
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X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |