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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)