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Common Stock and Stock-Based Compensation (Tables)
 6 Months Ended
Nov. 30, 2016
Share-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 Operating overhead expense: 
 
 
Three Months Ended November 30,
 
Six Months Ended November 30,
(In millions)
 
2016
 
2015
 
2016
 
2015
Stock options(1)
 
$
36

 
$
45

 
$
75

 
$
84

ESPPs
 
11

 
8

 
20

 
15

Restricted stock
 
7

 
9

 
16

 
17

TOTAL STOCK-BASED COMPENSATION EXPENSE
 
$
54

 
$
62

 
$
111

 
$
116

(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 $3 million and $8 million for the three months ended November 30, 2016 and 2015, respectively, and $8 million and $14 million for the six months ended November 30, 2016 and 2015, respectively.
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The weighted average assumptions used to estimate these fair values were as follows:
 
 
Six Months Ended November 30,
  
 
2016
 
2015
Dividend yield
 
1.1
%
 
1.0
%
Expected volatility
 
17.4
%
 
23.6
%
Weighted average expected life (in years)
 
6.0

 
5.8

Risk-free interest rate
 
1.3
%
 
1.7
%