Stock-Based Compensation (Tables)

3 Months Ended

Aug. 31, 2013

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 August 31,
(In millions)	2013		2012
Stock options(1)	$	29	$	26
ESPPs	5		4
Restricted stock	8		7
TOTAL STOCK-BASED COMPENSATION EXPENSE	$	42	$	37

(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 endedAugust 31, 2013 and 2012 was $4 million for both respective periods.

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,
	2013		2012
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	%