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Divestitures - Summary of Assets and Liabilities Held for Sale (Parenthetical) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Sep. 30, 2018
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Divestitures [Abstract] |  |
Allowance for doubtful accounts | $ 3 | $ 3

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- Definition Disposal group including discontinued operation allowance for doubtful accounts receivable current. + References No definition available. + Details
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Namespace Prefix: | ash_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Divestitures. + References No definition available. + Details
Name: | ash_DivestituresAbstract
Namespace Prefix: | ash_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration