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v3.22.1

Financial Information by Segment - Financial Information by Reportable Segment (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021
Segment Reporting Information [Line Items] |  |  |  |
Revenues from external customers | $ 1,092 | $ 842 | $ 2,060 | $ 1,588
Income (loss) before income taxes | 147 | 118 | 54 | 217
Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from external customers | 1,023 | 791 | 1,927 | 1,492
Income (loss) before income taxes | 171 | 149 | 308 | 289
Unallocated and Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from external customers | 69 | 51 | 133 | 96
Income (loss) before income taxes | (24) | (31) | (254) | (72)
Reinforcement Materials [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from external customers | 627 | 434 | 1,168 | 809
Income (loss) before income taxes | 101 | 89 | 186 | 177
Performance Chemicals [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from external customers | 360 | 294 | 662 | 561
Income (loss) before income taxes | 70 | 58 | 122 | 112
Purification Solutions [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from external customers | $ 36 | 63 | $ 97 | $ 122
Income (loss) before income taxes |  | $ 2 |  |

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