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Stock-Based Compensation (Tables)
 3 Months Ended
Aug. 31, 2012
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan

The following table summarizes the Company’s total stock-based compensation expense recognized in selling and administrative expense:

 

     Three Months Ended
August  31,		  

(In millions)

    2012      2011  

Stock options(1)

    $ 26       $ 18   

ESPPs

      4         3   

Restricted stock

      7         4   
  

 

 

     

 

 

  

TOTAL STOCK-BASED COMPENSATION EXPENSE

    $ 37       $ 25   
  

 

 

     

 

 

  

 

(1) Expense for stock options includes the expense associated with stock appreciation rights. Accelerated stock option expense is recorded for employees eligible for accelerated stock option vesting upon retirement. Accelerated stock option expense was $4 million for each of the three month periods ended August 31, 2012 and 2011.
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The weighted average assumptions used to estimate these fair values are as follows:

 

     Three Months Ended
August 31,		  
      2012     2011  

Dividend yield

      1.5 %      1.4 % 

Expected volatility

      35.0 %      29.4 % 

Weighted average expected life (in years)

      5.3        5.0   

Risk-free interest rate

      0.6 %      1.5 %