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 (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Restructuring reserve, period expense	$ 2	$ (5)	$ 2	$ 43
Certain Item [Member]
Segment Reporting Information [Line Items]
Restructuring reserve, period expense	$ 2	(5)	$ (2)	43
Charges for environmental expense		1		3
Certain Item [Member] | Devaluation of Argentine Peso [Member]
Segment Reporting Information [Line Items]
Foreign currency exchange rate, re measurement loss		$ 3		$ 11