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, 2014	Sep. 30, 2013	Sep. 30, 2012
U.S. Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net (gains) losses	$ (4)	$ (32)	$ (3)
Prior service cost			(1)
Amortization of prior unrecognized loss		(2)	(1)
Total other comprehensive (income) loss	(4)	(34)	(5)
Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net (gains) losses	50	8	27
Amortization of prior unrecognized loss	(3)	(4)	(3)
Other	(1)	(4)	1
Total other comprehensive (income) loss	46		25
U. S. Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net (gains) losses	(4)	(6)	1
Prior service cost	3	3	1
Amortization of prior service credit			3
Total other comprehensive (income) loss	(1)	(3)	5
Foreign Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net (gains) losses			1
Total other comprehensive (income) loss			$ 1