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		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
Restructuring reserve, period expense	$ 2	$ 2	$ 45	$ 14
Employee benefit plan settlement charge				18
Certain Item [Member]
Segment Reporting Information [Line Items]
Restructuring reserve, period expense	2	2	45	14
Asset Impairment Charges		563		563
Executive transition costs	3		3
Net foreign currency exchange rate, re measurement loss		$ 2		2
Charges for environmental expense	$ 1		4
Acquisition and integration related charges				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			$ 11