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Goodwill and Intangible Assets | 12 Months Ended
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Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | Note G. Goodwill and Intangible Assets 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 |
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 |
Intangible assets are amortized over their estimated useful lives, which range between ten and twenty-five years, with a weighted average amortization period of seventeen years. Amortization expense for fiscal 2023, 2022 and 2021 was $6 million, $6 million and $8 million, respectively, and is included in Cost of sales, Selling and administrative expenses and Research and technical expenses in the Consolidated Statements of Operations. Total amortization expense is estimated to be approximately $6 million each year for the next five fiscal years.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 350 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//350/tableOfContent + Details
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