Employee Benefit Plans (Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
U.S. Pension Benefits [Member]
Net losses (gains)	$ (3)	$ 2	$ 5
Prior service cost	(1)
Amortization of prior unrecognized loss	(1)
Total other comprehensive (loss) income	(5)	2	5
Foreign Pension Benefits [Member]
Net losses (gains)	27	1	12
Amortization of prior unrecognized loss	(3)	(3)	(2)
Other	1		1
Total other comprehensive (loss) income	25	(2)	11
U. S. Postretirement Benefits [Member]
Net losses (gains)	1	(1)	1
Prior service cost	1	(2)
Amortization of prior service (cost) credit	3	4	4
Total other comprehensive (loss) income	5	1	5
Foreign Postretirement Benefits [Member]
Net losses (gains)	1	(1)
Prior service cost
Amortization of prior service (cost) credit
Amortization of prior unrecognized loss
Other
Total other comprehensive (loss) income	$ 1	$ (1)