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Goodwill and Intangible Assets - Schedule of Changes in Balances (Detail) $ in Millions | 9 Months Ended
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Jun. 30, 2024 USD ($)
Goodwill And Intangible Assets [Line Items] |
Beginning balance | $ 134
Foreign currency impact | (2)
Ending balance | 132
Reinforcement Materials [Member] |
Goodwill And Intangible Assets [Line Items] |
Beginning balance | 51
Foreign currency impact | (2)
Ending balance | 49
Performance Chemicals [Member] |
Goodwill And Intangible Assets [Line Items] |
Beginning balance | 83
Ending balance | $ 83

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