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Financial Information by Segment - Schedule of Income (Loss) from Continuing Operations before Taxes for Unallocated and Other (Parenthetical) (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Segment Reporting Information [Line Items]        
Restructuring reserve, period expense $ (5) $ 5 $ 43 $ 12
Employee benefit plan settlement charge       18
Certain Item [Member]        
Segment Reporting Information [Line Items]        
Restructuring reserve, period expense (5) 5 43 12
Charges for environmental expense 1   3  
Acquisition and integration related charges   $ 1   2
Employee benefit plan settlement charge       $ 18
Certain Item [Member] | Devaluation of Argentine Peso [Member]        
Segment Reporting Information [Line Items]        
Net foreign currency exchange rate, re measurement loss $ 3   $ 11