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Financial Information by Segment - 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 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Segment Reporting Information [Line Items]        
Interest expense $ (14) $ (14) $ (29) $ (27)
Goodwill and long-lived assets impairment charge (20)   (20)  
Global restructuring activities (2) 9 (11) 8
Gains (losses) on sale of investments       10
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 (14) (14) (29) (27)
Unallocated corporate costs (13) (16) (25) (30)
General unallocated income (expense) 1 (3) 3 (3)
Less: Equity in earnings of affiliated companies, net of tax   1   2
Income from continuing operations before income taxes and equity in earnings of affiliated companies (63) (298) (98) (319)
Certain Item [Member]        
Segment Reporting Information [Line Items]        
Inventory reserve adjustment   (13)   (13)
Global restructuring activities (2) 9 (11) 8
Legal and environmental matters and reserves (1) (5) (1) (6)
Gains (losses) on sale of investments       10
Acquisition and integration-related charges (1) (1) (4) (1)
Other (2)     (1)
Total certain items, pre-tax (37) (264) (47) (257)
Certain Item [Member] | Specialty Fluids [Member]        
Segment Reporting Information [Line Items]        
Held for sale asset impairment charge (20)   (20)  
Certain Item [Member] | Equity Affiliate Investment [Member]        
Segment Reporting Information [Line Items]        
Investment impairment charge $ (11)   $ (11)  
Certain Item [Member] | Purification Solutions [Member]        
Segment Reporting Information [Line Items]        
Goodwill and long-lived assets impairment charge   $ (254)   $ (254)