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Long Term Debt and Other Financing Arrangements (Tables)
 12 Months Ended
May 31, 2014
Long Term Debt (Tables) [Abstract]  
Components of Long-term Debt (Net of Discounts)
      May 31,
      2014 2013
Senior unsecured debt:     
 Interest Rate % Maturity      
 7.38 2014 $ - $ 250
 8.00 2019   750   750
 2.625 2023   499   499
 2.70 2023   249   249
 4.00 2024   749   -
 4.90 2034   499   -
 3.875 2043   493   493
 4.10 2043   499   499
 5.10 2044   749   -
 7.60 2098   239   239
 Total senior unsecured debt   4,726   2,979
Capital lease obligations  11   11
        4,737   2,990
  Less current portion  1   251
      $ 4,736 $ 2,739