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Leases (Details 1) (USD $)
In Millions, unless otherwise specified
12 Months Ended
May 31, 2014
May 31, 2013
May 31, 2012
Operating Leases Rent Expense [Abstract]      
Minimum rentals $ 2,154us-gaap_OperatingLeasesRentExpenseMinimumRentals $ 2,061us-gaap_OperatingLeasesRentExpenseMinimumRentals $ 2,018us-gaap_OperatingLeasesRentExpenseMinimumRentals
Contingent rentals 197us-gaap_OperatingLeasesRentExpenseContingentRentals [1] 192us-gaap_OperatingLeasesRentExpenseContingentRentals [1] 210us-gaap_OperatingLeasesRentExpenseContingentRentals [1]
Operating leases rent expense, total $ 2,351us-gaap_LeaseAndRentalExpense $ 2,253us-gaap_LeaseAndRentalExpense $ 2,228us-gaap_LeaseAndRentalExpense
[1] Contingent rentals are based on equipment usage.