Debt Long-term Debt Footnote N (Details) - USD ($) $ in Millions	Feb. 28, 2014	Feb. 28, 2013
Floating Rate U.S. Dollar Note Due 2015 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 250
Debt instrument, stated interest rate	0.23%
4.25% U.S. Dollar Notes Due 2013 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 750
Debt instrument, stated interest rate		4.25%

Face (par) amount of debt instrument at time of issuance.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant