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Debt and Other Financing Activities - U.S. Accounts Receivable Sales Program - Additional Information (Details) - U.S. Accounts Receivable Sales Program [Member] - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2022 | Sep. 30, 2021
Disclosure Of Sales Program Of Receivable [Line Items] |  |  |
Maximum limit of receivables can transfer |  | $ 125 | $ 125
Sales against the buyers limit |  | 97 | 113
Amount transferred in receivables |  | 122 | 167
Gross cash proceeds received for receivables transferred and derecognized |  | 177 |
Cash proceeds collected |  | 193 |
Payments for (proceeds from) new transfers of receivables |  | 16 |
Maximum [Member] |  |  |
Disclosure Of Sales Program Of Receivable [Line Items] |  |  |
Gain (loss) on sale of receivables | $ (1) | (1) |
Recorded liabilities related to service obligations and limited guarantee | $ 1 | $ 1 | $ 1

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- Definition Amount transferred in receivables. + References No definition available. + Details
Name: | ash_AmountTransferredInReceivables
Namespace Prefix: | ash_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Cash proceeds received for receivables + References No definition available. + Details
Name: | ash_CashProceedsReceivedForReceivables
Namespace Prefix: | ash_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Disclosure of sales program of receivable. + References No definition available. + Details
Name: | ash_DisclosureOfSalesProgramOfReceivableLineItems
Namespace Prefix: | ash_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Gross cash proceeds received for receivables transferred. + References No definition available. + Details
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Namespace Prefix: | ash_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Maximum limit of receivables for sale. + References No definition available. + Details
Name: | ash_MaximumLimitOfReceivablesForSale
Namespace Prefix: | ash_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Payments for (proceeds from) new transfers of receivables. + References No definition available. + Details
Name: | ash_PaymentsForProceedsFromNewTransfersOfReceivables
Namespace Prefix: | ash_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Recorded liabilities related to service obligations and limited guarantee. + References No definition available. + Details
Name: | ash_RecordedLiabilitiesRelatedToServiceObligationsAndLimitedGuarantee
Namespace Prefix: | ash_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Sales against the buyers limit + References No definition available. + Details
Name: | ash_SalesAgainstTheBuyersLimit
Namespace Prefix: | ash_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of gain (loss) on sale of accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107425-111719 + Details
Name: | us-gaap_GainLossOnSaleOfAccountsReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=ash_USAccountsReceivableSalesProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |