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Financial Statements - Additional Information (Detail) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) Segment Entity | Jun. 30, 2018 USD ($) Segment Entity | Jun. 30, 2017 Segment | Sep. 30, 2017 USD ($) Entity | Sep. 30, 2012 InterestInvestment Entity | Oct. 31, 2016 shares
Financial Statement Details [Line Items] |  |  |  |  |  |
Number of Countries in which Entity Operates |  | 150 |  |  |  |
Adient shares received per 10 shares of Johnson Controls shares | shares |  |  |  |  |  | 1
Johnson Controls shares converted into one share of Adient | shares |  |  |  |  |  | 10
Interest percentage minimum for investments in partially-owned affiliates to be accounted for by the equity method |  | 20.00% |  |  |  |
Number of VIEs where Company is Primary Beneficiary | Entity | 1 |  |  | 1 |  |
Number of separate investments a pre-existing VIE was reorganized into | Entity |  |  |  |  | 3 |
Additional interests acquired | InterestInvestment |  |  |  |  | 2 |
Third party debt agreement |  | $ 157 |  |  |  |
Loans to partially-owned affiliates |  | 38 |  |  |  |
Floor guarantee |  | $ 25 |  |  |  |
Number of VIEs in which Company was not primary beneficiary | Entity |  | 3 |  | 2 |  |
Restricted Cash and Cash Equivalents | $ 31 | $ 19 |  | $ 31 |  |
Restricted Cash and Investments, Current | 22 | 10 |  | 22 |  |
Restricted Cash and Cash Equivalents, Noncurrent | 9 | $ 9 |  | 9 |  |
Number of reportable segments | Segment |  | 5 |  |  |  |
Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |  |  |  |
Financial Statement Details [Line Items] |  |  |  |  |  |
Investment balance of the Company's nonconsolidated VIEs | $ 65 | $ 42 |  | $ 65 |  |
Power Solutions |  |  |  |  |  |
Financial Statement Details [Line Items] |  |  |  |  |  |
Number of VIEs where Company is Primary Beneficiary | Entity |  | 1 |  |  |  |
Building Technologies & Solutions |  |  |  |  |  |
Financial Statement Details [Line Items] |  |  |  |  |  |
Number of reportable segments | Segment | 4 |  | 5 |  |  |

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