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CONSOLIDATED STATEMENTS OF EQUITY PARENTHETICAL (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
May 31, 2013
May 31, 2012
May 31, 2011
Equity:      
Beginning common stock shares outstanding 4,905 5,068 5,026
Common stock issued under stock-based compensation plans 84 40 78
Common stock issued under stock purchase plans 3 4 4
Repurchase of common stock (346.1) (207.3) (40.4)
Ending common stock shares outstanding 4,646 4,905 5,068
Dividends declared per common share (in dollars per share) $ 0.30 $ 0.24 $ 0.21