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Goodwill and Intangible Assets | 6 Months Ended
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Mar. 31, 2022
Goodwill And Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | E. 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 six months ended March 31, 2022 are as follows:
|  | Reinforcement Materials |  |  | Performance Chemicals |  |  | Total |
|  | (In millions) |
Balance at September 30, 2021 |  | $ | 48 |  |  | $ | 92 |  |  | $ | 140 |
Foreign currency impact |  |  | — |  |  |  | 1 |  |  |  | 1 |
Balance at March 31, 2022 |  | $ | 48 |  |  | $ | 93 |  |  | $ | 141 |
The following table provides information regarding the Company’s intangible assets:
|  | March 31, 2022 |  |  | September 30, 2021 |
|  | 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 |  | $ | 36 |  |  | $ | (7 | ) |  | $ | 29 |  |  | $ | 62 |  |  | $ | (12 | ) |  | $ | 50 |
Trademarks |  |  | 3 |  |  |  | (1 | ) |  |  | 2 |  |  |  | 11 |  |  |  | (1 | ) |  |  | 10 |
Customer relationships |  |  | 61 |  |  |  | (22 | ) |  |  | 39 |  |  |  | 60 |  |  |  | (20 | ) |  |  | 40 |
Total intangible assets |  | $ | 100 |  |  | $ | (30 | ) |  | $ | 70 |  |  | $ | 133 |  |  | $ | (33 | ) |  | $ | 100 |
Intangible assets are amortized over their estimated useful lives, which range between ten and twenty-five years, with a weighted average amortization period of approximately seventeen years. Amortization expense was $1 million and $2 million for the three months ended March 31, 2022 and 2021, respectively, and $3 million and $4 million for the six months ended March 31, 2022 and 2021, respectively. Amortization expense 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 -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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