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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)