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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Activity of restricted stock units
The following table summarizes the activity of restricted stock units for employees and non-employee directors during the year ended December 31, 2021: 
Restricted Stock UnitsSharesWeighted-average Grant-date Fair Value
Unvested at December 31, 2020305,959 $1,697 
Granted142,149 $2,282 
Vested(118,675)$1,801 
Forfeited(47,509)$1,902 
Unvested at December 31, 2021281,924 $1,914 
Activity of performance share units
The following table summarizes the activity of performance share units for employees during the year ended December 31, 2021:
Performance Share UnitsSharesWeighted-average Grant-date Fair Value
Unvested at December 31, 202084,478 $1,930 
Granted(1)
42,173 $2,287 
Vested(55,426)$1,999 
Performance Shares Adjustment(2)
44,346 $2,125 
Forfeited(7,248)$1,792 
Unvested at December 31, 2021108,323 $2,123 
(1)    Excludes 12,251 performance share units awarded during the year ended December 31, 2021 for which the grant date             under ASC 718, Compensation - Stock Compensation, was not established as of December 31, 2021. Among other conditions, for the grant date to be established, a mutual understanding is required to be reached between the Company and the employee of the key terms and conditions of the award, including the performance targets. The performance targets for each of the annual performance periods under the award are set at the beginning of the respective year.
(2)    Probable outcome for performance-based awards is updated based upon changes in actual and forecasted operating results or expected achievement of performance goals, as applicable, and the impact of modifications.
Estimated vesting of performance share units granted
The following table summarizes the estimated vesting, as of December 31, 2021, of performance share units granted in 2021, 2020, and 2019, net of forfeiture and vesting since the respective grant dates:
Performance Share Units, by grant year
2021(1)
20202019
Shares probable to be issued 63,523 11,752 33,048 
Shares not subject to the achievement of minimum performance thresholds28,198 — 33,048 
Shares that could be issued if maximum performance thresholds are met63,523 18,080 61,669 
(1)    Excludes performance share units awarded during the year ended December 31, 2021 for which the grant date under ASC 718 was not established as disclosed above.
Assumptions used to value option grants
The following table summarizes the assumptions used to value options granted during the year ended December 31, 2020 using the Black-Scholes options pricing model:
Black-Scholes assumptions
Risk-free interest rate0.56 %
Expected term in years6.4
Expected stock price volatility33.8 %
Expected dividend yield0 %
Activity for stock options
The following table summarizes the activity for stock options during the year ended December 31, 2021:
Employee Stock OptionsNumber of SharesWeighted-average
 Exercise Price		Aggregate
 Intrinsic Value (in millions)		Weighted-average Remaining Contractual Term (in years)
Balance, December 31, 2020152,746 $1,401 $126 9.3
Exercised(3,768)$1,212 
Expired(281)$716 
Forfeited(12,846)$1,411 
Balance, December 31, 2021135,851 $1,407 $135 8.3
Exercisable at December 31, 2021836 $788 $1 1.8