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Selected Current Liabilities (Details) - USD ($)
$ in Millions
May 31, 2018
May 31, 2017
Accrued Liabilities Current [Abstract]    
Salaries $ 498 $ 431
Employee benefits, including variable compensation 933 781
Compensated absences 746 702
Accrued salaries and employee benefits 2,177 1,914
Self-insurance accruals 957 976
Taxes other than income taxes 334 283
Other 1,840 1,971
Accrued expenses $ 3,131 $ 3,230