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, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Unallocated and Other [Member]	Sep. 30, 2012 Unallocated and Other [Member]	Sep. 30, 2011 Unallocated and Other [Member]	Sep. 30, 2013 Unallocated and Other [Member] Other Products and Services [Member]	Sep. 30, 2012 Unallocated and Other [Member] Other Products and Services [Member]	Sep. 30, 2011 Unallocated and Other [Member] Other Products and Services [Member]	Sep. 30, 2013 Unallocated and Other [Member] Shipping and Handling Fees [Member]	Sep. 30, 2012 Unallocated and Other [Member] Shipping and Handling Fees [Member]	Sep. 30, 2011 Unallocated and Other [Member] Shipping and Handling Fees [Member]
Segment Reporting Information [Line Items]
Net sales	$ 898	$ 903	$ 842	$ 820	$ 848	$ 846	$ 844	$ 762	$ 3,463	$ 3,300	$ 87	$ 96	$ 84	$ 5	$ 11	$ (2)	$ 82	$ 85	$ 86