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Financial Information by Segment & Geographic Area - Revenue from External Customers by Geographic Region (Detail) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Segment Reporting Information [Line Items]      
Net sales and other operating revenues $ 3,994 $ 3,931 $ 4,321
Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Net sales and other operating revenues 3,860 3,788 4,158
Unallocated and Other [Member]      
Segment Reporting Information [Line Items]      
Net sales and other operating revenues 134 143 163
Reinforcement Materials [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Net sales and other operating revenues 2,610 2,563 2,673
Performance Chemicals [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Net sales and other operating revenues 1,250 1,225 1,388
Purification Solutions [Member]      
Segment Reporting Information [Line Items]      
Net sales and other operating revenues     97
Purification Solutions [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Net sales and other operating revenues     97
Americas [Member]      
Segment Reporting Information [Line Items]      
Net sales and other operating revenues 1,434 1,425 1,534
Americas [Member] | Reinforcement Materials [Member]      
Segment Reporting Information [Line Items]      
Net sales and other operating revenues 1,056 1,046 1,072
Americas [Member] | Performance Chemicals [Member]      
Segment Reporting Information [Line Items]      
Net sales and other operating revenues 378 379 419
Americas [Member] | Purification Solutions [Member]      
Segment Reporting Information [Line Items]      
Net sales and other operating revenues     43
Asia Pacific [Member]      
Segment Reporting Information [Line Items]      
Net sales and other operating revenues 1,521 1,486 1,630
Asia Pacific [Member] | Reinforcement Materials [Member]      
Segment Reporting Information [Line Items]      
Net sales and other operating revenues 1,015 995 1,049
Asia Pacific [Member] | Performance Chemicals [Member]      
Segment Reporting Information [Line Items]      
Net sales and other operating revenues 506 491 567
Asia Pacific [Member] | Purification Solutions [Member]      
Segment Reporting Information [Line Items]      
Net sales and other operating revenues     14
Europe, Middle East and Africa [Member]      
Segment Reporting Information [Line Items]      
Net sales and other operating revenues 905 877 994
Europe, Middle East and Africa [Member] | Reinforcement Materials [Member]      
Segment Reporting Information [Line Items]      
Net sales and other operating revenues 539 522 552
Europe, Middle East and Africa [Member] | Performance Chemicals [Member]      
Segment Reporting Information [Line Items]      
Net sales and other operating revenues $ 366 $ 355 402
Europe, Middle East and Africa [Member] | Purification Solutions [Member]      
Segment Reporting Information [Line Items]      
Net sales and other operating revenues     $ 40