CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) In Millions, unless otherwise specified	Nov. 30, 2012	May 31, 2012
Class A Convertible Common Stock
Common Stock, shares outstanding	180	180
Class B Common Stock
Common Stock, shares outstanding	716	738

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

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-Name Accounting Standards Codification

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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-Name Regulation S-X (SX)

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-Name Accounting Standards Codification

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant