Restructuring - Recorded Restructuring Activities (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, period expense	$ 5	$ 6
Cost of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, period expense	5	3
Selling and Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, period expense		2
Research and Technical Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, period expense		$ 1