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Litigation, Claims and Contingencies - Summary of Progression of Insurance Receivable (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Insurance settlement |  | $ 3 | $ 0 | $ 3 |  | $ 1 |  |  |  |  |  |
Ashland [Member] |  |  |  |  |  |  |  |  |  |  |  |
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Insurance receivable - beginning of year |  |  |  | 100 | [1] | 103 | [1] | $ 103 | [1] | $ 123 | [1] | $ 140
Receivable adjustment | [2] |  |  | 0 |  | (2) |  | 6 |  | 1 |  | (5)
Insurance settlement |  |  |  | 0 |  | (0) |  | (0) |  | (10) |  | 0
Amounts collected |  |  |  | (2) |  | (5) |  | (9) |  | (11) |  | (12)
Insurance receivable - end of period | [1] | 98 | 96 | 98 |  | 96 |  | 100 |  | 103 |  | 123
Hercules [Member] |  |  |  |  |  |  |  |  |  |  |  |
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Insurance receivable - beginning of year |  |  |  | 47 | [3] | 47 | [3] | 47 | [3] | 49 | [3] | 54
Receivable adjustment | [4] |  |  | 0 |  | (1) |  | 1 |  | (2) |  | (5)
Amounts collected |  |  |  | (1) |  | 0 |  | (1) |  | 0 |  | 0
Insurance receivable - end of period | [3] | $ 46 | $ 46 | $ 46 |  | $ 46 |  | $ 47 |  | $ 47 |  | $ 49
[1] | Includes $12 million classified in accounts receivable on the Condensed Consolidated Balance Sheets as of March 31, 2022 and September 30, 2021.
[2] | The six months ended March 31, 2021 includes a reserve adjustment of $2 million related to allowances for credit losses as a result of Ashland’s adoption of the new credit measurement standard. The total allowance for credit losses was $2 million as of March 31, 2022.
[3] | Includes $1 million classified in accounts receivable on the Condensed Consolidated Balance Sheets as of March 31, 2022 and September 30, 2021.
[4] | The six months ended March 31, 2021 includes a reserve adjustment of $1 million related to allowances for credit losses as a result of Ashland’s adoption of the new credit measurement standard. The total allowance for credit losses was $1 million as of March 31, 2022.

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- Definition The increase (decrease) during the reporting period in insurance settlements receivable, which are amounts due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy. The expectation is that such reimbursement will be received within one year of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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- 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
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- 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 -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 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3367-108585 + Details
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