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v3.23.2

Financial Information by Segment - Revenue from External Customers by Geographic Region (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Segment Reporting Information [Line Items] |  |  |  |
Net sales and other operating revenues | $ 968 | $ 1,149 | $ 2,966 | $ 3,209
Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales and other operating revenues | 931 | 1,106 | 2,858 | 3,089
Unallocated and Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales and other operating revenues | 37 | 43 | 108 | 120
Americas [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales and other operating revenues | 354 | 416 | 1,064 | 1,124
Asia Pacific [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales and other operating revenues | 353 | 412 | 1,120 | 1,209
Europe, Middle East and Africa [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales and other operating revenues | 224 | 278 | 674 | 756
Reinforcement Materials [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales and other operating revenues |  | 23 | 72 |
Reinforcement Materials [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales and other operating revenues | 624 | 730 | 1,939 | 1,947
Reinforcement Materials [Member] | Americas [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales and other operating revenues | 260 | 302 | 781 | 767
Reinforcement Materials [Member] | Asia Pacific [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales and other operating revenues | 234 | 265 | 752 | 773
Reinforcement Materials [Member] | Europe, Middle East and Africa [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales and other operating revenues | 130 | 163 | 406 | 407
Performance Chemicals [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales and other operating revenues |  | 4 | 11 |
Performance Chemicals [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales and other operating revenues | 307 | 376 | 919 | 1,045
Performance Chemicals [Member] | Americas [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales and other operating revenues | 94 | 114 | 283 | 314
Performance Chemicals [Member] | Asia Pacific [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales and other operating revenues | 119 | 147 | 368 | 422
Performance Chemicals [Member] | Europe, Middle East and Africa [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales and other operating revenues | $ 94 | $ 115 | $ 268 | 309
Purification Solutions [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales and other operating revenues |  |  |  | 97
Purification Solutions [Member] | Americas [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales and other operating revenues |  |  |  | 43
Purification Solutions [Member] | Asia Pacific [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales and other operating revenues |  |  |  | 14
Purification Solutions [Member] | Europe, Middle East and Africa [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales and other operating revenues |  |  |  | $ 40

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