XML 84 R78.htm IDEA: XBRL DOCUMENT
v3.25.1

Litigation, Claims and Contingencies - Summary of Progression of Insurance Receivable (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Ashland [Member] |  |  |  |  |  |  |  |  |  |
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward] |  |  |  |  |  |  |  |  |  |
Insurance receivable - beginning of year |  | $ 97 | [1] | $ 95 | [1] | $ 95 | [1] | $ 101 | [1] | $ 100
Receivable adjustment | [2] | 0 |  | 0 |  | 11 |  | 3 |  | 7
Amounts collected |  | (2) |  | (4) |  | (9) |  | (9) |  | (6)
Insurance receivable - end of period | [1] | 95 |  | 91 |  | 97 |  | 95 |  | 101
Hercules [Member] |  |  |  |  |  |  |  |  |  |
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward] |  |  |  |  |  |  |  |  |  |
Insurance receivable - beginning of year |  | 50 | [3] | 47 | [3] | 47 | [3] | 52 | [3] | 47
Receivable adjustment | [4] | 0 |  | 0 |  | 6 |  | (3) |  | 7
Amounts collected |  | (4) |  | (2) |  | (3) |  | (2) |  | (2)
Insurance receivable - end of period | [3] | $ 46 |  | $ 45 |  | $ 50 |  | $ 47 |  | $ 52
[1] | Includes $9 million classified in accounts receivable, net on the Condensed Consolidated Balance Sheets at March 31, 2025 and September 30, 2024.
[2] | The total allowance for credit losses was $1 million at of March 31, 2025 and September 30, 2024.
[3] | Includes $6 million classified in accounts receivable, net on the Condensed Consolidated Balance Sheets at March 31, 2025 and September 30, 2024.
[4] | The total allowance for credit losses was $1 million at March 31, 2025 and September 30, 2024.

X
- Definition Loss contingency insurance receivable increase (decrease). + References No definition available. + Details
Name: | ash_LossContingencyInsuranceReceivableIncreaseDecrease
Namespace Prefix: | ash_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of receivable related to a loss contingency accrual. For example, an insurance recovery receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482425/460-10-50-3 + Details
Name: | us-gaap_LossContingencyReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of cash inflow from the collection of receivables related to a loss contingency. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482425/460-10-50-3 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 17 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-17 + Details
Name: | us-gaap_LossContingencyReceivableProceeds
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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: | dei_LegalEntityAxis=ash_HerculesLimitedLiabilityCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |