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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
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]    
Interest expense $ (15) $ (13)
Global restructuring activities (9) (1)
Gains (losses) on sale of investments   10
Unallocated and Other [Member]    
Segment Reporting Information [Line Items]    
Interest expense (15) (13)
Unallocated corporate costs (12) (14)
General unallocated income (expense) 2  
Less: Equity in earnings of affiliated companies, net of tax   1
Income from continuing operations before income taxes and equity in earnings of affiliated companies (35) (21)
Certain Item [Member]    
Segment Reporting Information [Line Items]    
Global restructuring activities (9) (1)
Legal and environmental matters and reserves   (1)
Gains (losses) on sale of investments   10
Acquisition and integration-related charges (3)  
Other 2 (1)
Total certain items, pre-tax $ (10) $ 7