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STOCK-BASED COMPENSATION (Tables)
 3 Months Ended
Mar. 31, 2022
Share-based Payment Arrangement [Abstract]  
Activity in Restricted Stock Units
The following table summarizes the activity in restricted stock units for employees and non-employee directors during the three months ended March 31, 2022: 
Restricted Stock UnitsSharesWeighted-average Grant-date Fair Value
Unvested at December 31, 2021281,924 $1,914 
Granted161,384 $2,102 
Vested(129,438)$1,805 
Forfeited(11,234)$2,022 
Unvested at March 31, 2022302,636 $2,057 
Activity in Performance Share Units
The following table summarizes the activity in performance share units for employees during the three months ended March 31, 2022:
Performance Share UnitsSharesWeighted-average Grant-date Fair Value
Unvested at December 31, 2021(1)
108,323 $2,123 
Granted(2),(3)
50,063 $2,211 
Vested(42,888)$1,854 
Performance shares adjustment (4)
31,598 $2,392 
Forfeited(1,128)$2,274 
Unvested at March 31, 2022145,968 $2,290 
(1)    Excludes 12,251 performance share units awarded during the year ended December 31, 2021 for which the grant date under Accounting Standards Codification ("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)     Excludes 9,692 performance share units awarded during the three months ended March 31, 2022 for which the grant date under ASC 718 has not been established as of March 31, 2022.
(3)     Includes 7,856 performance share units awarded during the year ended December 31, 2021 for which the grant date under ASC 718 was established.
(4)    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.
Activity in Stock Options
The following table summarizes the activity in stock options during the three months ended March 31, 2022: 
Employee Stock Options Number of SharesWeighted-average
 Exercise Price		Aggregate
 Intrinsic Value (in millions)		Weighted-average Remaining Contractual Term
(in years)
Balance, December 31, 2021135,851 $1,407 $135 8.3
Exercised(2,386)$1,411 
Forfeited (3,085)$1,411 
Balance, March 31, 2022130,380 $1,407 $123 8.0
Exercisable at March 31, 20221,317 $1,015 $2 1.1