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Guarantees - Additional Information (Detail) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Guarantor Obligations [Line Items] |  |  |
Post sale contingent tax indemnification liabilities | $ 276 | $ 290 | $ 290
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 |  |
Business Divestitures, Not Specific [Member] |  |  |
Guarantor Obligations [Line Items] |  |  |
Post sale contingent tax indemnification liabilities | $ 235 |  |

X
- Definition Maximum length, in years, of a product warranty for it to be recorded in other current liabilities. + References No definition available. + Details
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X
- Definition Minimum length, in years, of a product warranty for it to be recorded in other noncurrent liabilities. + References No definition available. + Details
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Namespace Prefix: | jci_
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X
- Definition Post sale contingent tax indemnification liabilities + References No definition available. + Details
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Balance Type: | credit
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_
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |