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Goodwill and Other Intangible Assets - Summary of Goodwill by Reportable Segment (Details) $ in Millions | 6 Months Ended
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Mar. 31, 2025 USD ($)
Goodwill [Roll Forward] |  |
Balance at beginning of period | $ 1,381 |
Currency translation | (24) |
Avoca business - divestiture | (1) | [1]
Balance at end of period | 1,356 |
Life Sciences [Member] |  |
Goodwill [Roll Forward] |  |
Balance at beginning of period | 822 |
Currency translation | (15) |
Avoca business - divestiture | 0 | [1]
Balance at end of period | 807 |
Personal Care [Member] |  |
Goodwill [Roll Forward] |  |
Balance at beginning of period | 125 | [2]
Currency translation | (1) | [2]
Avoca business - divestiture | (1) | [1],[2]
Balance at end of period | 123 | [2]
Specialty Additives [Member] |  |
Goodwill [Roll Forward] |  |
Balance at beginning of period | 434 | [2]
Currency translation | (8) | [2]
Avoca business - divestiture | 0 | [1],[2]
Balance at end of period | 426 | [2]
Intermediates [Member] |  |
Goodwill [Roll Forward] |  |
Balance at beginning of period | 0 | [2]
Currency translation | 0 | [2]
Avoca business - divestiture | 0 | [1],[2]
Balance at end of period | $ 0 | [2]
[1] | Ashland allocated $1 million to the Avoca disposal group during the six months ended March 31, 2025. See Note B of the Notes to the Condensed Consolidated Financial Statements for more information.
[2] | As of March 31, 2025 and September 30, 2024, there were accumulated impairments of $356 million, $174 million and $90 million related to the Personal Care, Specialty Additives and Intermediates reportable segments, respectively.

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