XML 95 R86.htm IDEA: XBRL DOCUMENT
v3.22.1

Litigation, Claims and Contingencies - Summary of Progression of Insurance Receivable (Parenthetical) (Details) - USD ($) $ in Millions | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Ashland [Member] |  |  |  |  |  |  |  |  |  |  |  |
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Insurance receivable |  | $ 96 | [1] | $ 98 | [1] | $ 100 | [1] | $ 103 | [1] | $ 123 | [1] | $ 140
Allowance for credit losses |  | 2 |  |  |  |  |  |  |  |  |  |
Total allowance for credit losses |  |  |  | 2 |  |  |  |  |  |  |  |
Ashland [Member] | Accounts Receivable [Member] |  |  |  |  |  |  |  |  |  |  |  |
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Insurance receivable | [1] |  |  | 12 |  | 12 |  |  |  |  |  |
Hercules [Member] |  |  |  |  |  |  |  |  |  |  |  |
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Insurance receivable |  | 46 | [2] | 46 | [2] | 47 | [2] | $ 47 | [2] | $ 49 | [2] | $ 54
Allowance for credit losses |  | $ 1 |  |  |  |  |  |  |  |  |  |
Total allowance for credit losses |  |  |  | 1 |  |  |  |  |  |  |  |
Hercules [Member] | Accounts Receivable [Member] |  |  |  |  |  |  |  |  |  |  |  |
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Insurance receivable |  |  |  | $ 1 |  | $ 1 |  |  |  |  |  |
[1] | Includes $12 million classified in accounts receivable on the Condensed Consolidated Balance Sheets as of March 31, 2022 and September 30, 2021.
[2] | Includes $1 million classified in accounts receivable on the Condensed Consolidated Balance Sheets as of March 31, 2022 and September 30, 2021.

X
- Definition Loss contingency reserve adjustment related to allowance for credit losses. + References No definition available. + Details
Name: | ash_LossContingencyReserveAdjustmentRelatedToAllowanceForCreditLosses
Namespace Prefix: | ash_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Loss contingency reserve allowance for credit losses. + References No definition available. + Details
Name: | ash_LossContingencyReserveAllowanceForCreditLosses
Namespace Prefix: | ash_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of receivable related to a loss contingency accrual. For example, an insurance recovery receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=124440162&loc=d3e12053-110248 + Details
Name: | us-gaap_LossContingencyReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_MovementInLossContingencyRelatedReceivableIncreaseDecreaseRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=ash_AshlandGlobalHoldingsIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_AccountsReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=ash_HerculesLimitedLiabilityCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |