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STOCK-BASED COMPENSATION (Tables) | 3 Months Ended
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Mar. 31, 2023
Share-Based Payment Arrangement [Abstract] |
Activity of Restricted Stock Units and Performance Share Units | The following table summarizes the activity in restricted stock units and performance share units for employees and non-employee directors during the three months ended March 31, 2023:
|  | Restricted Stock Units |  | Performance Share Units
|  | Shares |  | Weighted-average Grant-date Fair Value |  | Shares |  | Weighted-average Grant-date Fair Value
Unvested at December 31, 2022 (1) |  | 280,460 |  | $2,070 |  | 143,702 |  | $2,294
Granted (2) |  | 158,615 |  | $2,620 |  | 51,866 |  | $2,679
Vested |  | (123,150) |  | $1,980 |  | (30,118) |  | $2,327
Performance shares adjustment (3) |  | — |  | — |  | 33,424 |  | $2,412
Forfeited |  | (4,457) |  | $2,225 |  | (5,225) |  | $2,241
Unvested at March 31, 2023 |  | 311,468 |  | $2,384 |  | 193,649 |  | $2,414
(1) Excludes 14,087 performance share units awarded during the years ended December 31, 2022 and 2021 for which the grant date under Accounting Standards Codification ("ASC") 718, Compensation - Stock Compensation, was not established as of December 31, 2022. 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) Includes 9,688 performance share units awarded during the years ended December 31, 2022 and 2021 for which the grant date under ASC 718 was established. (3) 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 of Stock Options | The following table summarizes the activity in stock options during the three months ended March 31, 2023:
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, 2022 |  | 120,813 |  |  | $1,408 |  | $ | 73 |  |  | 7.3
Exercised |  | (74,545) |  |  | $1,411 |  |  |  |
Forfeited |  | (62) |  |  | $1,411 |  |  |  |
Balance, March 31, 2023 |  | 46,206 |  |  | $1,404 |  | $ | 58 |  |  | 7.0
Exercisable at March 31, 2023 |  | 46,206 |  |  | $1,404 |  | $ | 58 |  |  | 7.0
The aggregate intrinsic value of employee stock options exercised during the three months ended March 31, 2023 was $89 million.

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