Financial Information by Segments & Geographic Area - Royalties Paid by Equity Affiliates, External Shipping and Handling Fees, Impact of Corporate Adjustment for Unearned Revenue and Notes Receivable Reflected by Unallocated and Other (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Unallocated and Other [Member]	Sep. 30, 2013 Unallocated and Other [Member]	Sep. 30, 2012 Unallocated and Other [Member]	Sep. 30, 2014 Unallocated and Other [Member] 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]	Sep. 30, 2013 Unallocated and Other [Member] 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]	Sep. 30, 2012 Unallocated and Other [Member] 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]	Sep. 30, 2014 Unallocated and Other [Member] Shipping and Handling Costs [Member]	Sep. 30, 2013 Unallocated and Other [Member] Shipping and Handling Costs [Member]	Sep. 30, 2012 Unallocated and Other [Member] Shipping and Handling Costs [Member]
Segment Reporting Information [Line Items]
Net sales	$ 911	$ 940	$ 898	$ 898	$ 896	$ 901	$ 840	$ 819	$ 3,647	$ 3,456	$ 104	$ 107	$ 96	$ (7)	$ 5	$ 11	$ 111	$ 102	$ 85