Property, Plant and Equipment - Components of Property, Plant and Equipment (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Property Plant And Equipment [Abstract]
Land and land improvements	$ 138	$ 167
Buildings	511	495
Machinery and equipment	2,511	2,379
Other	238	226
Construction in progress	278	244
Total property, plant and equipment	3,676	3,511
Less: accumulated depreciation	(2,071)	(1,959)
Net property, plant and equipment	$ 1,605	$ 1,552	$ 1,036