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v3.19.3

Income Taxes - Summary of Changes in Unrecognized Tax Benefits (Parenthetical) (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Tax and tax indemnity receivables | $ 68 | $ 74
Valvoline [Member] |  |
Tax and tax indemnity receivables | $ 32 | $ 39

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- Definition Tax indemnity receivable established as a result of an acquisition of divestiture. + References No definition available. + Details
Name: | ash_TaxIndemnityReceivable
Namespace Prefix: | ash_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=ash_ConsumerMarketsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |