STOCK-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2022

Share-based Payment Arrangement, Noncash Expense [Abstract]

Stock-Based Compensation Cost and Associated Tax Benefit

Presented below is a summary of the stock-based compensation cost and associated tax benefit included in the accompanying consolidated statements of operations:

	Three Months Ended March 31,
	2022		2021
Stock-based compensation cost	$	46	$	45
Tax benefit	$	11	$	11

Weighted Average Assumptions used in Determining Fair Value for Options Granted

The following weighted average assumptions were used in determining the fair value using the Black-Scholes option-pricing model for options granted in 2022:

Expected dividend yield	0.86	%
Expected stock volatility	27	%
Risk-free interest rate	1.88	%
Expected holding period	5.6 years

Stock Option Exercises and Restricted Stock Vesting

The following table summarizes information relating to stock option exercises and restricted stock vesting:

	Three Months Ended March 31,
	2022		2021
Exercise of stock options:
Proceeds from stock option exercises	$	3	$	6
Aggregate intrinsic value	$	4	$	9
Tax benefit realized upon exercise	$	1	$	2
Number of shares exercised (1)	—		0.1
Vesting of restricted stock:
Fair value of shares vested	$	166	$	178
Tax benefit realized upon vesting	$	39	$	41
Number of shares vested	0.5		0.6
Vesting of performance-based restricted stock:
Fair value of shares vested	$	50	$	29
Tax benefit realized upon vesting	$	12	$	6
Number of shares vested	0.2		0.1

(1) The number of options exercised in 2022 was approximately 20 thousand.