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Summary of Quarterly Operating Results (Unaudited) (Tables)
12 Months Ended
May 31, 2011
Quarterly Operating Results (Tables) Abstract  
Summary of Quarterly Operating Results (Unaudited)
  First Second Third Fourth  
(in millions, except per share amounts)Quarter Quarter Quarter Quarter  
               
2011              
Revenues$ 9,457 $ 9,632 $ 9,663 $ 10,552  
Operating income  628   469   393   888  
Net income  380   283   231   558  
Basic earnings per common share(1)  1.21   0.90   0.73   1.76  
Diluted earnings per common share  1.20   0.89   0.73   1.75  
               
2010              
Revenues$ 8,009 $ 8,596 $ 8,701 $ 9,428  
Operating income  315   571   416   696  
Net income  181   345   239   419  
Basic earnings per common share  0.58   1.10   0.76   1.34  
Diluted earnings per common share(1)  0.58   1.10   0.76   1.33  
               
(1) The sum of the quarterly earnings per share may not equal annual amounts due to differences in the weighted-average number of shares outstanding during the respective period.