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Goodwill and Other Intangible Assets - Summary of Other Intangible Assets (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Sep. 30, 2024
--- | --- | ---
Finite Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount |  | $ 1,328 | $ 1,561
Accumulated amortization |  | (1,026) | (1,088)
Net carrying amount |  | 302 | 473
Intangible Assets, Net [Abstract] |  |  |
Gross carrying amount |  | 1,606 | 1,839
Net carrying amount |  | 580 | 751
Trademarks and Trade Names [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | [1] | 72 | 87
Accumulated amortization | [1] | (37) | (42)
Net carrying amount | [1] | 35 | 45
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract] |  |  |
Indefinite-lived intangible assets |  | 278 | 278
Intellectual Property [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | [2] | 666 | 715
Accumulated amortization | [2] | (609) | (613)
Net carrying amount | [2] | 57 | 102
Customer and Supplier Relationships [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | [3] | 590 | 759
Accumulated amortization | [3] | (380) | (433)
Net carrying amount | [3] | $ 210 | $ 326
[1] | 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.
[2] | 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.
[3] | 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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