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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
3 Months Ended 12 Months Ended
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Segment Reporting Information [Line Items]        
Interest expense   $ (59) $ (54) $ (53)
Global restructuring activities   (16) 30 (3)
Goodwill and long-lived assets impairment charge   (29)    
Gains (losses) on sale of investments     10  
Specialty Fluids [Member]        
Segment Reporting Information [Line Items]        
Loss on sale and asset impairment charge   (29)    
Purification Solutions [Member]        
Segment Reporting Information [Line Items]        
Goodwill and long-lived assets impairment charge $ (224)      
Unallocated and Other [Member]        
Segment Reporting Information [Line Items]        
Interest expense   (59) (54) (53)
Unallocated corporate costs   (50) (61) (50)
General unallocated income (expense)   8 2 3
Less: Equity in earnings of affiliated companies, net of tax   1 2 7
Income from continuing operations before income taxes and equity in earnings of affiliated companies   (189) (363) (110)
Certain Items [Member]        
Segment Reporting Information [Line Items]        
Legal and environmental matters and reserves   (21) (16) 1
Global restructuring activities   (16) 30 (3)
Acquisition and integration-related charges   (6) (2)  
Executive transition costs   (1) (2)  
Inventory reserve adjustment     (13)  
Gains (losses) on sale of investments     10  
Other certain items   (3) (1) (1)
Total certain items, pre-tax   (87) (248) $ (3)
Certain Items [Member] | Equity Affiliate Investment [Member]        
Segment Reporting Information [Line Items]        
Investment impairment charge   $ (11)    
Certain Items [Member] | Purification Solutions [Member]        
Segment Reporting Information [Line Items]        
Goodwill and long-lived assets impairment charge     $ (254)