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Financial Information by Segment & Geographic Area - Other Financial Information by Reportable Segment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting Information [Line Items]      
Revenues $ 3,713 $ 3,994 $ 3,931
Depreciation and amortization 154 151 144
Equity in earnings of affiliated companies, net of tax 7 6 5
Assets 3,815 3,736 3,604
Total expenditures for additions to long-lived assets 303 249 265
Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues 3,591 3,860 3,788
Depreciation and amortization 154 144 142
Equity in earnings of affiliated companies, net of tax 7 6 5
Assets 3,322 3,245 3,105
Total expenditures for additions to long-lived assets 300 241 257
Unallocated and Other [Member]      
Segment Reporting Information [Line Items]      
Revenues 122 134 143
Depreciation and amortization   7 2
Equity in earnings of affiliated companies, net of tax 7 6 5
Assets 493 491 499
Total expenditures for additions to long-lived assets 3 8 8
Reinforcement Materials [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues 2,341 2,610 2,563
Depreciation and amortization 70 66 70
Equity in earnings of affiliated companies, net of tax 3 2 2
Assets 1,822 1,751 1,632
Total expenditures for additions to long-lived assets 209 165 149
Performance Chemicals [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues 1,250 1,250 1,225
Depreciation and amortization 84 78 72
Equity in earnings of affiliated companies, net of tax 4 4 3
Assets 1,500 1,494 1,473
Total expenditures for additions to long-lived assets $ 91 $ 76 $ 108