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STOCK-BASED EMPLOYEE COMPENSATION (Tables) | 9 Months Ended
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Sep. 30, 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 nine months ended September 30, 2021:
Restricted Stock Units |  | Shares |  | Weighted-average Grant-date Fair Value
Unvested at December 31, 2020 |  | 305,959 |  |  |  | $ | 1,697 |  |
Granted |  | 133,667 |  |  |  | $ | 2,270 |  |
Vested |  | (114,486) |  |  |  | $ | 1,793 |  |
Forfeited |  | (39,382) |  |  |  | $ | 1,882 |  |
Unvested at September 30, 2021 |  | 285,758 |  |  |  | $ | 1,901 |  |
Activity of Performance Share Units | The following table summarizes the activity of performance share units for employees during the nine months ended September 30, 2021:
Performance Share Units |  | Shares | Weighted-average Grant-date Fair Value
Unvested at December 31, 2020 |  | 84,478 |  |  | $ | 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 September 30, 2021 |  | 108,323 |  |  | $ | 2,123 |  |
(1) Excludes 12,251 performance share units awarded during the nine months ended September 30, 2021 for which the grant date under ASC 718, Compensation - Stock Compensation, has not yet been established. 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 September 30, 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) |  | 2020 |  | 2019
Shares probable to be issued |  | 63,523 |  |  | 11,752 |  |  | 33,048 |
Shares not subject to the achievement of minimum performance thresholds |  | 28,198 |  |  | — |  |  | 33,048 |
Shares that could be issued if maximum performance thresholds are met |  | 63,523 |  |  | 18,080 |  |  | 61,669 |
(1) Excludes performance share units awarded during the nine months ended September 30, 2021 for which the grant date under ASC 718 has not yet been established as disclosed above.
Activity for Stock Options | The following table summarizes the activity for stock options during the nine months ended September 30, 2021:
Employee Stock Options |  | Number of Shares |  | Weighted-average Exercise Price |  | Aggregate Intrinsic Value (in millions) |  | Weighted-average Remaining Contractual Term (in years)
Balance, December 31, 2020 |  | 152,746 |  |  |  | $ | 1,401 |  |  |  | $ | 126 |  |  | 9.3
Exercised |  | (3,592) |  |  |  | $ | 1,226 |  |  |  |  |  |
Forfeited |  |  | (12,846) |  |  |  | $ | 1,411 |  |  |  |  |  |
Balance, September 30, 2021 |  | 136,308 |  |  |  | $ | 1,405 |  |  |  | $ | 132 |  |  | 8.5
Exercisable at September 30, 2021 |  | 1,293 |  |  |  | $ | 789 |  |  |  | $ | 2 |  |  | 1.9

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