Financial Information by Segment - Royalties Paid by Equity Affiliates, External Shipping and Handling Fees, and the Impact of Corporate Adjustment for Unearned Revenue and Notes Receivable Reflected by Unallocated and Other (Detail) (Unallocated and Other [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]
Net sales	$ 38	$ 34	$ 83	$ 81
Royalties, Other Operating Revenues, the Impact of Unearned Revenue, the Removal of 100% of the Sales of an Equity Method Affiliate and Discounting Charges for Certain Notes Receivable [Member]
Segment Reporting Information [Line Items]
Net sales	10	9	(2)	6
Shipping and Handling Costs [Member]
Segment Reporting Information [Line Items]
Net sales	$ 28	$ 25	$ 85	$ 75