Stock-Based Compensation (Tables)

9 Months Ended

Feb. 28, 2022

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 FEBRUARY 28,				NINE MONTHS ENDED FEBRUARY 28,
(Dollars in millions)	2022		2021		2022		2021
Stock options(1)	$	75	$	73	$	221	$	250
ESPPs	15		15		44		50
Restricted stock and restricted stock units(1)(2)	71		54		202		167
TOTAL STOCK-BASED COMPENSATION EXPENSE	$	161	$	142	$	467	$	467

(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. An immaterial amount of accelerated stock option and restricted stock expense was also recorded for certain employees impacted by the Company's organizational realignment; for more information see Note 14 — Restructuring.

(2)Includes expense for performance-based restricted stock units granted during the nine months ended February 28, 2022.

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

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

	NINE MONTHS ENDED FEBRUARY 28,
	2022		2021
Dividend yield	0.8	%	0.9	%
Expected volatility	24.9	%	27.3	%
Weighted average expected life (in years)	5.8		6.0
Risk-free interest rate	0.9	%	0.4	%