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Leases (Tables)
12 Months Ended
May 31, 2011
Leases (Tables) Abstract  
Components of Property and Equipment Recorded Under Capital Leases
  May 31,
  2011 2010
       
Aircraft$ 8 $ 15
Package handling and ground support     
 equipment  165   165
Vehicles  17   17
Other, principally facilities  145   146
    335   343
 Less accumulated amortization  307   312
  $ 28 $ 31
Schedule of Rent Expense Under Operating Leases
Rent expense under operating leases for the years ended May 31 was as follows (in millions):
           
  2011 2010 2009 
           
Minimum rentals$ 2,025 $ 2,001 $ 2,047 
Contingent rentals(1)  193   152   181 
  $ 2,218 $ 2,153 $ 2,228 
           
(1) Contingent rentals are based on equipment usage. 
Schedule of Future Minimum Lease Payments, Capital and Operating Leases
      Operating Leases 
      Aircraft    Total 
   Capital and Related Facilities Operating 
   Leases Equipment  and Other Leases 
               
2012 $ 25 $ 494 $ 1,300 $ 1,794 
2013  119   499   1,155   1,654 
2014  2   473   992   1,465 
2015  2   455   899   1,354 
2016  2   458   734   1,192 
Thereafter  13   1,545   4,988   6,533 
Total  163 $ 3,924 $ 10,068 $ 13,992 
               
Less amount representing interest  17          
Present value of net minimum lease            
 payments$ 146