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Goodwill and Other Intangible Assets (Tables) | 6 Months Ended
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Mar. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of Goodwill by Reportable Segment | The following is a progression of goodwill by reportable segment for the six months ended March 31, 2025:
| Life |  |  | Personal |  |  | Specialty |  |  |  |  |  |  |
(In millions) | Sciences |  |  | Care(a) |  |  | Additives(a) |  |  | Intermediates(a) |  |  | Total |
Balance at September 30, 2024 | $ | 822 |  |  | $ | 125 |  |  | $ | 434 |  |  | $ | — |  |  | $ | 1,381 |
Currency translation |  | (15 | ) |  |  | (1 | ) |  |  | (8 | ) |  |  | — |  |  |  | (24 | )
Avoca business - divestiture(b) |  | — |  |  |  | (1 | ) |  |  | — |  |  |  | — |  |  |  | (1 | )
Balance at March 31, 2025 | $ | 807 |  |  | $ | 123 |  |  | $ | 426 |  |  | $ | — |  |  | $ | 1,356 |
(a) 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. (b) 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.
Summary of Other Intangible Assets | Other intangible assets were comprised of the following as of:
| March 31, 2025 |  |  | September 30, 2024 |
| Gross |  |  |  |  |  | Net |  |  | Gross |  |  |  |  |  | Net |
| carrying |  |  | Accumulated |  |  | carrying |  |  | carrying |  |  | Accumulated |  |  | carrying |
(In millions) | amount |  |  | amortization |  |  | amount |  |  | amount |  |  | amortization |  |  | amount |
Definite-lived intangibles |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trademarks and trade names(a) | $ | 72 |  |  | $ | (37 | ) |  | $ | 35 |  |  | $ | 87 |  |  | $ | (42 | ) |  | $ | 45 |
Intellectual property(b) |  | 666 |  |  |  | (609 | ) |  |  | 57 |  |  |  | 715 |  |  |  | (613 | ) |  |  | 102 |
Customer and supplier relationships(c) |  | 590 |  |  |  | (380 | ) |  |  | 210 |  |  |  | 759 |  |  |  | (433 | ) |  |  | 326 |
Total definite-lived intangibles |  | 1,328 |  |  |  | (1,026 | ) |  |  | 302 |  |  |  | 1,561 |  |  |  | (1,088 | ) |  |  | 473 |
Indefinite-lived intangibles |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trademarks and trade names |  | 278 |  |  |  | — |  |  |  | 278 |  |  |  | 278 |  |  |  | — |  |  |  | 278 |
Total intangible assets | $ | 1,606 |  |  | $ | (1,026 | ) |  | $ | 580 |  |  | $ | 1,839 |  |  | $ | (1,088 | ) |  | $ | 751 |
(a) Ashland allocated $7 million to the Avoca business during the six months ended March 31, 2025. See Note B of the Notes to the Condensed Consolidated Financial Statements for additional details. (b) Ashland allocated $29 million to the Avoca business during the six months ended March 31, 2025. See Note B of the Notes to the Condensed Consolidated Financial Statements for additional details. (c) Ashland allocated $98 million to the Avoca business during the six months ended March 31, 2025. See Note B of the Notes to the Condensed Consolidated Financial Statements for additional details.

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