Employee Benefit Plans - Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income, Pre-Tax (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
U.S. Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net (gains) losses	$ (32)	$ (3)	$ 2
Prior service cost		(1)
Amortization of prior unrecognized loss	(2)	(1)
Total other comprehensive (income) loss	(34)	(5)	2
Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net (gains) losses	8	27	1
Amortization of prior unrecognized loss	(4)	(3)	(3)
Other	(4)	1
Total other comprehensive (income) loss		25	(2)
U. S. Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net (gains) losses	(6)	1	(1)
Prior service cost	3	1	(2)
Amortization of prior service (cost) credit		3	4
Total other comprehensive (income) loss	(3)	5	1
Foreign Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net (gains) losses		1	(1)
Total other comprehensive (income) loss		$ 1	$ (1)