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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill Balances | The carrying amount of goodwill attributable to each reportable segment with goodwill balances and the changes in those balances during the fiscal years ended September 30, 2025 and 2024 are as follows:
|  | Reinforcement Materials |  |  | Performance Chemicals |  |  | Total |
|  | (In millions) |
Balance at September 30, 2023 |  | $ | 51 |  |  | $ | 83 |  |  | $ | 134 |
Foreign currency impact |  |  | (3 | ) |  |  | 2 |  |  |  | (1 | )
Balance at September 30, 2024 |  |  | 48 |  |  |  | 85 |  |  |  | 133 |
Foreign currency impact |  |  | 2 |  |  |  | (1 | ) |  |  | 1 |
Balance at September 30, 2025 |  | $ | 50 |  |  | $ | 84 |  |  | $ | 134 |
Schedule of Intangible Assets with Finite Lives | The following table provides information regarding the Company’s intangible assets with finite lives:
|  | September 30, 2025 |  |  | September 30, 2024 |
|  | Gross Carrying Value |  |  | Accumulated Amortization |  |  | Net Intangible Assets |  |  | Gross Carrying Value |  |  | Accumulated Amortization |  |  | Net Intangible Assets |
|  | (In millions) |
Developed technologies(1) |  | $ | 41 |  |  | $ | (14 | ) |  | $ | 27 |  |  | $ | 34 |  |  | $ | (12 | ) |  | $ | 22 |
Trademarks |  |  | 2 |  |  |  | (1 | ) |  | $ | 1 |  |  |  | 2 |  |  |  | (1 | ) |  |  | 1 |
Customer relationships |  |  | 63 |  |  |  | (36 | ) |  |  | 27 |  |  |  | 60 |  |  |  | (30 | ) |  |  | 30 |
Total intangible assets |  | $ | 106 |  |  | $ | (51 | ) |  | $ | 55 |  |  | $ | 96 |  |  | $ | (43 | ) |  | $ | 53 |
(1) Included within Developed technologies as of September 30, 2025 is $8 million of intangible assets acquired during the first quarter of fiscal 2025 as discussed in Note C above.

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