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Income Taxes (Tables)
12 Months Ended
May 31, 2014
Income Taxes (Tables) [Abstract]  
Schedule of Components of the Provision for Income Taxes
   2014 2013 2012
Current provision (benefit)        
 Domestic:        
  Federal$ 624 $ 512 $ (120)
  State and local  56   86   80
 Foreign  194   170   181
     874   768   141
Deferred provision (benefit)        
 Domestic:        
  Federal  238   175   947
  State and local  62   (7)   21
 Foreign  18   (42)   -
     318   126   968
   $ 1,192 $ 894 $ 1,109
Schedule of Reconciliation of the Statutory Federal Income Tax Rate to the Effective Income Tax Rate
   2014 2013 2012
Statutory U.S. income tax rate 35.0%  35.0%  35.0%
Increase (decrease) resulting from:        
          
 State and local income taxes,        
  net of federal benefit 2.3   2.1   2.1 
 Other, net (1.0)   (0.7)   (1.8) 
Effective tax rate 36.3%  36.4%  35.3%
Schedule of Significant Components of Deferred Tax Assets and Liabilities
  2014 2013
  Deferred Tax Assets Deferred Tax Liabilities Deferred Tax Assets Deferred Tax Liabilities
Property, equipment,            
 leases and intangibles$ 120 $ 3,730 $ 157 $ 3,676
Employee benefits  1,464   11   1,771   11
Self-insurance accruals  555   -   533   -
Other  292   290   251   238
Net operating loss/credit           
 carryforwards  333   -   298   -
Valuation allowances  (245)   -   (204)   -
  $ 2,519 $ 4,031 $ 2,806 $ 3,925
Schedule of Net Deferred Tax Liabilities
 2014 2013
Current deferred tax assets$ 522 $ 533
Noncurrent deferred tax assets(1)  80   -
Noncurrent deferred tax liabilities  (2,114)   (1,652)
 $ (1,512) $ (1,119)
      
(1)Noncurrent deferred tax assets are included in the line item Other Assets in our Consolidated Balance Sheet.
      
Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits
  2014 2013 2012
          
Balance at beginning of year$ 47 $ 51 $ 69
 Increases for tax positions taken in the current year  1   1   2
 Increases for tax positions taken in prior years  3   3   4
 Decreases for tax positions taken in prior years  (3)   (3)   (35)
 Settlements  (6)   (9)   (3)
 Increases due to acquisitions  -   4   15
 Decrease from lapse of statute of limitations  (3)   (2)   -
 Changes due to currency translation  (1)   2   (1)
          
Balance at end of year$ 38 $ 47 $ 51