v2.4.0.6
Reconciliation from Basic Earnings Per Share to Diluted Earnings Per Share (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
May 31, 2012
May 31, 2011
May 31, 2010
Determination of shares:      
Weighted average common shares outstanding 460.0 475.5 485.5
Assumed conversion of dilutive stock options and awards 9.8 10.2 8.4
DILUTED WEIGHTED AVERAGE COMMON SHARES OUTSTANDING 469.8 485.7 493.9
Basic earnings per common share (in dollars per share) $ 4.83 $ 4.48 $ 3.93
Diluted earnings per common share (in dollars per share) $ 4.73 $ 4.39 $ 3.86