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Property, Plant and Equipment - Leases (Details) - Buildings and improvements - USD ($) $ in Millions | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Property Subject to or Available for Operating Lease [Line Items] |  |
Properties in gross building and improvements | $ 36 | $ 34
Accumulated depreciation in gross buildings and improvements | $ 28 | $ 26

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- Definition Operating Leases, Lessor, Accumulated Depreciation + References No definition available. + Details
Name: | adnt_OperatingLeasesLessorAccumulatedDepreciation
Namespace Prefix: | adnt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Operating Leases, Lessor, Buildings and Improvements, Gross + References No definition available. + Details
Name: | adnt_OperatingLeasesLessorBuildingsAndImprovementsGross
Namespace Prefix: | adnt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_MajorPropertyClassAxis=us-gaap_BuildingAndBuildingImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |