Restructuring - Recorded Restructuring Activities (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, period expense	$ 4	$ 5	$ 24	$ 29
Cost of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, period expense	2	3	11	24
Selling and Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, period expense	2	1	13	4
Research and Technical Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, period expense		$ 1		$ 1