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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Jun. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Changes in Balances | The carrying amount of goodwill attributable to each reportable segment and the changes in those balances during the nine months ended June 30, 2025 are as follows:
|  | Reinforcement Materials |  |  | Performance Chemicals |  |  | Total |
|  | (In millions) |
Balance at September 30, 2024 |  | $ | 48 |  |  | $ | 85 |  |  | $ | 133 |
Foreign currency impact |  |  | 1 |  |  |  | (1 | ) |  |  | — |
Balance at June 30, 2025 |  | $ | 49 |  |  | $ | 84 |  |  | $ | 133 |
Schedule of Intangible Assets | The following table provides information regarding the Company’s intangible assets:
|  | June 30, 2025 |  |  | September 30, 2024 |
|  | Gross Carrying Value |  |  | Accumulated Amortization |  |  | Net Intangible Assets |  |  | Gross Carrying Value |  |  | Accumulated Amortization |  |  | Net Intangible Assets |
|  | (In millions) |
Intangible assets with finite lives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Developed technologies(1) |  | $ | 41 |  |  | $ | (14 | ) |  | $ | 27 |  |  | $ | 34 |  |  | $ | (12 | ) |  | $ | 22 |
Trademarks |  |  | 2 |  |  |  | (1 | ) |  |  | 1 |  |  |  | 2 |  |  |  | (1 | ) |  |  | 1 |
Customer relationships |  |  | 62 |  |  |  | (34 | ) |  |  | 28 |  |  |  | 60 |  |  |  | (30 | ) |  |  | 30 |
Total intangible assets |  | $ | 105 |  |  | $ | (49 | ) |  | $ | 56 |  |  | $ | 96 |  |  | $ | (43 | ) |  | $ | 53 |
(1) Included within Developed technologies as of June 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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