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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, 2018
Sep. 30, 2017
Sep. 30, 2016
Segment Reporting Information [Line Items]      
Interest expense $ (54) $ (53) $ (54)
Global restructuring activities 30 (3) (47)
Gains (losses) on sale of investments 10    
Unallocated and Other [Member]      
Segment Reporting Information [Line Items]      
Interest expense (54) (53) (54)
Unallocated corporate costs (61) (50) (45)
General unallocated income (expense) 2 3 4
Less: Equity in earnings of affiliated companies, net of tax 2 7 3
Income from continuing operations before income taxes and equity in earnings of affiliated companies (363) (110) (179)
Certain Items [Member]      
Segment Reporting Information [Line Items]      
Impairment of goodwill and long-lived assets of Purification Solutions (254)    
Global restructuring activities 30 (3) (47)
Legal and environmental matters and reserves (16) 1 (17)
Inventory reserve adjustment (13)    
Gains (losses) on sale of investments 10    
Acquisition and integration-related charges (2)    
Executive transition costs (2)   (6)
Non-recurring gain (loss) on foreign exchange     (11)
Other certain items (1) (1)  
Total certain items, pre-tax $ (248) $ (3) $ (81)