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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Sep. 30, 2023
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 year ended September 30, 2023 are as follows
|  | Reinforcement Materials |  |  | Performance Chemicals |  |  | Total |
|  | (In millions) |
Balance at September 30, 2022 |  | $ | 46 |  |  | $ | 83 |  |  | $ | 129 |
Foreign currency impact |  |  | 5 |  |  |  | — |  |  |  | 5 |
Balance at September 30, 2023 |  | $ | 51 |  |  | $ | 83 |  |  | $ | 134 |
Schedule of Intangible Assets with Finite Lives | The following table provides information regarding the Company’s intangible assets with finite lives:
|  | September 30, 2023 |  |  | September 30, 2022 |
|  | Gross Carrying Value |  |  | Accumulated Amortization |  |  | Net Intangible Assets |  |  | Gross Carrying Value |  |  | Accumulated Amortization |  |  | Net Intangible Assets |
|  | (In millions) |
Developed technologies |  | $ | 34 |  |  | $ | (10 | ) |  | $ | 24 |  |  | $ | 34 |  |  | $ | (8 | ) |  | $ | 26 |
Trademarks |  |  | 2 |  |  |  | (1 | ) |  |  | 1 |  |  |  | 2 |  |  |  | (1 | ) |  |  | 1 |
Customer relationships |  |  | 65 |  |  |  | (30 | ) |  |  | 35 |  |  |  | 59 |  |  |  | (23 | ) |  |  | 36 |
Total intangible assets |  | $ | 101 |  |  | $ | (41 | ) |  | $ | 60 |  |  | $ | 95 |  |  | $ | (32 | ) |  | $ | 63 |

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