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Stock-Based Compensation (Tables)
 9 Months Ended
Feb. 28, 2014
Common Stock and Stock-based Compensation [Abstract]  
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 February 28,
 
Nine Months Ended February 28,
(In millions)
 
2014
 
2013
 
2014
 
2013
Stock options(1)
 
$
32

 
$
32

 
$
93

 
$
90

ESPPs
 
5

 
4

 
16

 
14

Restricted stock
 
6

 
9

 
22

 
24

TOTAL STOCK-BASED COMPENSATION EXPENSE
 
$
43

 
$
45

 
$
131

 
$
128

(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 for the three month periods ended February 28, 2014 and 2013 was $3 million and $6 million, respectively, and for the nine month periods ended February 28, 2014 and 2013 was $11 million and $16 million, respectively.
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The weighted average assumptions used to estimate these fair values are as follows:
 
 
Nine Months Ended February 28,
  
 
2014
 
2013
Dividend yield
 
1.3
%
 
1.5
%
Expected volatility
 
27.9
%
 
35.0
%
Weighted average expected life (in years)
 
5.3

 
5.3

Risk-free interest rate
 
1.3
%
 
0.6
%