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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 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Segment Reporting Information [Line Items]        
Interest expense $ (14) $ (13) $ (41) $ (39)
Gains (losses) on sale of investments     10  
Unallocated and Other [Member]        
Segment Reporting Information [Line Items]        
Interest expense (14) (13) (41) (39)
Unallocated corporate costs (15) (11) (45) (37)
General unallocated income (expense)   (2) (3) 4
Less: Equity in earnings of affiliated companies, net of tax   3 2 6
Income from continuing operations before income taxes and equity in earnings of affiliated companies (32) (31) (351) (80)
Certain Item [Member]        
Segment Reporting Information [Line Items]        
Inventory reserve adjustment     (13)  
Global restructuring activities (1) (1) 7 (3)
Legal and environmental matters and reserves     (6) 2
Gains (losses) on sale of investments     10  
Executive transition costs (1)   (1)  
Acquisition and integration-related charges     (1)  
Non-recurring gains (losses) on foreign exchange   (1)   (1)
Other (1)   (2)  
Total certain items, pre-tax $ (3) $ (2) (260) $ (2)
Certain Item [Member] | Purification Solutions [Member]        
Segment Reporting Information [Line Items]        
Goodwill and long-lived assets impairment charge     $ (254)