STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2021

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 September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Stock-based compensation cost	$	41	$	38	$	127	$	110
Tax benefit	$	8	$	8	$	29	$	22

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 2021 (excluding the aforementioned RMS replacement awards):

Expected dividend yield	0.89	%
Expected stock volatility	28	%
Risk-free interest rate	0.81 %
Expected holding period	5.6 years

Stock Option Exercises and Restricted Stock Vesting

The following tables summarize information relating to stock option exercises and restricted stock vesting:

	Nine Months Ended September 30,
	2021		2020
Exercise of stock options:
Proceeds from stock option exercises	$	20	$	32
Aggregate intrinsic value	$	44	$	102
Tax benefit realized upon exercise	$	11	$	24
Number of shares exercised	0.2		0.5
Vesting of restricted stock:
Fair value of shares vested	$	193	$	195
Tax benefit realized upon vesting	$	45	$	45
Number of shares vested	0.7		0.8
Vesting of performance-based restricted stock:
Fair value of shares vested	$	28	$	70
Tax benefit realized upon vesting	$	7	$	17
Number of shares vested	0.1		0.3