Stock-Based Compensation (Tables)

6 Months Ended

Nov. 30, 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 NOVEMBER 30,				SIX MONTHS ENDED NOVEMBER 30,
(Dollars in millions)	2021		2020		2021		2020
Stock options(1)	$	81	$	107	$	146	$	177
ESPPs	14		17		29		35
Restricted stock and restricted stock units(1)(2)	75		65		131		113
TOTAL STOCK-BASED COMPENSATION EXPENSE	$	170	$	189	$	306	$	325

(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 and certain employees impacted by the Company's organizational realignment. For more information, see Note 13 — Restructuring.

(2)Includes expense for performance-based restricted stock units granted during the six months ended November 30, 2021.

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,
	2021		2020
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	%