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Financial Information by Segment & Geographic Area - Schedule of Income (Loss) from Continuing Operations before Income Taxes and Equity in Earnings of Affiliated Companies for Unallocated and Other (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Segment Reporting Information [Line Items] |  |  |
Interest expense | $ (81) | $ (90) | $ (56)
Gain on sale of land |  | 1 | 17
Loss on sale of business and asset impairment charge |  | 3 | 207
Gain on bargain purchase of a business |  |  | 24
Unallocated and Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Interest expense | (81) | (90) | (56)
Unallocated corporate costs | (68) | (54) | (59)
General unallocated income (expense) | 42 | 22 | 1
Less: Equity in earnings of affiliated companies, net of tax | 6 | 5 | 10
Income from continuing operations before income taxes and equity in earnings of affiliated companies | (172) | (156) | (307)
Certain Items [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Global restructuring activities | (13) | (4) | (3)
Legal and environmental matters and reserves | (2) | (10) | (9)
Gain on sale of land |  | 1 | 17
Acquisition and integration-related charges |  | (4) | (6)
Loss on sale of business and asset impairment charge |  | (3) | (207)
Gain on bargain purchase of a business |  |  | 24
Employee benefit plan settlement and other charges |  |  | 1
Other certain items | (1) | (2) |
Total certain items, pre-tax | (59) | (29) | (183)
Certain Items [Member] | Argentina [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Currency devaluation and other losses | $ (43) | $ (7) |
Certain Items [Member] | Specialty Fluids [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Divestiture related benefit |  |  | 5
Certain Items [Member] | Purification Solutions [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Divestiture related charges |  |  | $ (5)

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