Summarization for Foreign Currency Forward Purchase and Sale Contracts (Detail) (Foreign Exchange Forward Contracts [Member]) In Millions, unless otherwise specified	Sep. 30, 2014 Long [Member] Australian dollars [Member] AUD	Sep. 30, 2014 Long [Member] British pounds [Member] GBP (£)	Sep. 30, 2014 Long [Member] Canada, Dollars CAD	Sep. 30, 2014 Long [Member] European euro [Member] EUR (€)	Sep. 30, 2014 Long [Member] South African Rand [Member] ZAR	Sep. 30, 2014 Long [Member] Japanese yen [Member] JPY (¥)	Sep. 30, 2014 Long [Member] U.S. dollars [Member] USD ($)	Sep. 30, 2014 Long [Member] Other Currency [Member] USD ($)	Sep. 30, 2014 Short [Member] British pounds [Member] GBP (£)	Sep. 30, 2014 Short [Member] Canada, Dollars CAD	Sep. 30, 2014 Short [Member] European euro [Member] EUR (€)	Sep. 30, 2014 Short [Member] Japanese yen [Member] JPY (¥)	Sep. 30, 2014 Short [Member] U.S. dollars [Member] USD ($)
Derivative [Line Items]
Notional Amount in Foreign Currency	2	£ 30	1	€ 6	116	¥ 144	$ 12	$ 1	£ (3)	(2)	€ (3)	¥ (1,038)	$ (67)