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Litigation, Claims and Contingencies - Schedule of Progression of Activity in the Asbestos Reserve (Parenthetical) (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Sep. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
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Ashland [Member] |  |  |  |  |  |  |  |  |  |  |
Asbestos reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Asbestos reserve | $ 301 | [1] | $ 320 | [1] | $ 320 | [1] | $ 335 | [1] | $ 352 | [1] | $ 380
Ashland [Member] | Other Current Liabilities [Member] |  |  |  |  |  |  |  |  |  |  |
Asbestos reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Asbestos reserve | 29 |  | 29 |  |  |  |  |  |  |  |
Hercules [Member] |  |  |  |  |  |  |  |  |  |  |
Asbestos reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Asbestos reserve | 207 | [2] | 217 | [2] | $ 220 | [2] | $ 229 | [2] | $ 252 | [2] | $ 282
Hercules [Member] | Other Current Liabilities [Member] |  |  |  |  |  |  |  |  |  |  |
Asbestos reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Asbestos reserve | $ 17 |  | $ 18 |  |  |  |  |  |  |  |
[1] | Included $29 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of March 31, 2022 and September 30, 2021.
[2] | Included $17 million and $18 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of March 31, 2022 and September 30, 2021, respectively.

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