Derivative Instruments and Hedging Activities - Undesignated Hedges (Detail) (Derivatives Not Designated as Hedging Instruments [Member], Forward Exchange Contracts [Member], Other Income (Expense) [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Derivatives Not Designated as Hedging Instruments [Member] | Forward Exchange Contracts [Member] | Other Income (Expense) [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of Loss Recognized in Income on Derivatives	$ (10)	$ (5)	$ (5)	$ (1)