Nonconsolidated Partially-Owned Affiliates Summarized Income Statement Data of Company's Nonconsolidated Partially-Owned Affiliates (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Equity Method Investments and Joint Ventures [Abstract]
Net sales	$ 9,973	$ 9,261	$ 8,468
Gross profit	1,483	1,423	1,154
Net income attributable to the entity	$ 639	$ 664	$ 526