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Financial Information by Segment - Financial Information by Reportable Segment (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Segment Reporting Information [Line Items] |  |  |  |
Revenues from external customers | $ 1,016 | $ 968 | $ 2,993 | $ 2,966
Income (loss) before income taxes | 158 | 130 | 394 | 324
Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from external customers | 981 | 931 | 2,894 | 2,858
Income (loss) before income taxes | 191 | 164 | 534 | 437
Unallocated and Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from external customers | 35 | 37 | 99 | 108
Income (loss) before income taxes | (33) | (34) | (140) | (113)
Reinforcement Materials [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from external customers | 649 | 624 | 1,966 | 1,939
Income (loss) before income taxes | 136 | 132 | 414 | 348
Performance Chemicals [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from external customers | 332 | 307 | 928 | 919
Income (loss) before income taxes | $ 55 | $ 32 | $ 120 | $ 89

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