Aggregate notional amount of foreign currency derivatives to purchase a foreign currency. Notional amount refers to the number of currency units specified in the foreign currency derivative contract.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

-URI http://asc.fasb.org/extlink&oid=6519104

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959

Name:	us-gaap_NotionalAmountOfForeignCurrencyDerivativePurchaseContracts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Summarization for Foreign Currency Forward Purchase and Sale Contracts (Detail) In Millions, unless otherwise specified	Mar. 31, 2013 Australian dollars [Member] USD ($)	Mar. 31, 2013 British pounds [Member] GBP (£)	Mar. 31, 2013 European euro [Member] EUR (€)	Mar. 31, 2013 South African rand [Member] ZAR	Mar. 31, 2013 Japanese yen [Member] JPY (¥)	Mar. 31, 2013 U.S. dollars [Member] USD ($)	Mar. 31, 2013 Other [Member] USD ($)
Derivative [Line Items]
Notional Amount in Foreign Currency, Purchase	$ 2	£ 6		153		$ 1,958
Notional Amount in Foreign Currency, Sell			€ (51)		¥ (781)	$ (117)	$ (1)