Derivative Instruments and Hedging Activities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Forward exchange contracts [Member]	Sep. 30, 2013 Forward exchange contracts [Member]	Dec. 31, 2013 Interest rate swaps [Member] Cash flow hedges [Member]	Sep. 30, 2013 Interest rate swaps [Member] Cash flow hedges [Member]	Dec. 31, 2013 Commodity forward contracts [Member]	Sep. 30, 2013 Commodity forward contracts [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount of outstanding derivatives			$ 1,400	$ 2,200	$ 0	$ 0	$ 0	$ 0
Reclassification of terminated interest rate swaps to interest expense within the next 12 months	6
Gains or losses, related to hedge ineffectiveness	$ 0	$ 0