Restructuring - Recorded Restructuring Activities (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, period expense	$ 37	$ 15	$ 18
Cost of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, period expense	28	13	16
Selling and Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, period expense	7	2	2
Research and Technical Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, period expense	$ 2