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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, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Segment Reporting Information [Line Items] |  |  |
Interest expense | $ (90) | $ (56) | $ (49)
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 | (90) | (56) | (49)
Unallocated corporate costs | (54) | (59) | (58)
General unallocated income (expense) | 22 | 1 |
Less: Equity in earnings of affiliated companies, net of tax | 5 | 10 | 3
Income from continuing operations before income taxes and equity in earnings of affiliated companies | (156) | (307) | (144)
Certain Items [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Gain on sale of land | 1 | 17 |
Legal and environmental matters and reserves | (10) | (9) | (25)
Acquisition and integration-related charges | (4) | (6) | (5)
Global restructuring activities | (4) | (3) | (11)
Loss on sale of business and asset impairment charge | (3) | (207) |
Other certain items | (2) |  | (1)
Gain on bargain purchase of a business |  | 24 |
Employee benefit plan settlement and other charges |  | 1 | (4)
Indirect tax settlement credits |  |  | 12
Total certain items, pre-tax | (29) | (183) | $ (34)
Certain Items [Member] | Argentina [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Controlled currency devaluation loss | $ (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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