Restructuring (Recorded Restructuring Activities) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, period expense	$ 5	$ 2	$ 30	$ 14
Cost of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, period expense	3	2	24	13
Selling and Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, period expense	1		4	1
Research and Technical Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, period expense	$ 1		$ 2