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Unaudited Condensed Consolidated Balance Sheets (Parenthetical) - shares shares in Millions | Aug. 31, 2018 | May 31, 2018
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Class A convertible — 320 and 329 shares outstanding |  |
Common Stock, shares outstanding | 320 | 329
Class B — 1,269 and 1,272 shares outstanding |  |
Common Stock, shares outstanding | 1,269 | 1,272

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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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