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Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Dec. 31, 2023
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 three months ended December 31, 2023 are as follows:
|  | Reinforcement Materials |  |  | Performance Chemicals |  |  | Total |
|  | (In millions) |
Balance at September 30, 2023 |  | $ | 51 |  |  | $ | 83 |  |  | $ | 134 |
Foreign currency impact |  |  | 2 |  |  |  | 2 |  |  |  | 4 |
Balance at December 31, 2023 |  | $ | 53 |  |  | $ | 85 |  |  | $ | 138 |
Schedule of Intangible Assets | The following table provides information regarding the Company’s intangible assets:
|  | December 31, 2023 |  |  | September 30, 2023 |
|  | 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 |  | $ | 35 |  |  | $ | (11 | ) |  |  | 24 |  |  | $ | 34 |  |  | $ | (10 | ) |  | $ | 24 |
Trademarks |  |  | 2 |  |  |  | (1 | ) |  |  | 1 |  |  |  | 2 |  |  |  | (1 | ) |  |  | 1 |
Customer relationships |  |  | 67 |  |  |  | (31 | ) |  |  | 36 |  |  |  | 65 |  |  |  | (30 | ) |  |  | 35 |
Total intangible assets |  | $ | 104 |  |  | $ | (43 | ) |  | $ | 61 |  |  | $ | 101 |  |  | $ | (41 | ) |  | $ | 60 |

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