Consolidated Balance Sheets (Parenthetical) - shares shares in Millions	May. 31, 2015	May. 31, 2014
Class A Convertible Common Stock
Common Stock, shares outstanding	178	178
Class B Common Stock
Common Stock, shares outstanding	679	692

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

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-Publisher FASB

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-Publisher SEC

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Name:	us-gaap_CommonStockSharesOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant