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Venezuela - Additional Information (Detail)
$ in Millions
12 Months Ended
Sep. 30, 2016
USD ($)
VEB / $
Sep. 30, 2015
USD ($)
VEB / $
Sep. 30, 2014
USD ($)
Nature Of Operations [Line Items]      
Operating affiliate investment $ 14    
Conversion of Bolivars to USD | VEB / $ 656 52  
Maximum [Member]      
Nature Of Operations [Line Items]      
Net gain on exchange rate devaluation $ 1    
Subsidiaries      
Nature Of Operations [Line Items]      
Cash dividends received from subsidiary $ 2 $ 6 $ 5
Venezuela [Member] | Carbon Black Affiliate [Member]      
Nature Of Operations [Line Items]      
Equity method investment, ownership percentage 49.00%