Stock-Based Compensation (Tables)

3 Months Ended

Aug. 31, 2021

Share-based Payment Arrangement, Noncash Expense [Abstract]

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award

The following table summarizes the Company's total stock-based compensation expense recognized in Cost of sales or Operating overhead expense, as applicable: 

	THREE MONTHS ENDED AUGUST 31,
(Dollars in millions)	2021		2020
Stock options(1)	$	65	$	70
ESPPs	15		18
Restricted stock and restricted stock units(1)(2)	56		48
TOTAL STOCK-BASED COMPENSATION EXPENSE	$	136	$	136

(1)Expense for stock options includes the expense associated with stock appreciation rights. Accelerated stock option expense is primarily recorded for employees meeting certain retirement eligibility requirements.

(2)Includes expense for performance-based restricted stock units granted during the three months ended August 31, 2021.

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

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

	THREE MONTHS ENDED AUGUST 31,
	2021		2020
Dividend yield	0.7	%	1.0	%
Expected volatility	25.2	%	27.2	%
Weighted average expected life (in years)	5.9		6.0
Risk-free interest rate	0.8	%	0.3	%