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STOCK-BASED COMPENSATION
 6 Months Ended
Jun. 30, 2025
Share-Based Payment Arrangement [Abstract]  
STOCK-BASED COMPENSATION STOCK-BASED COMPENSATION
 
Restricted stock units and performance share units granted by the Company during the six months ended June 30, 2025 had an aggregate grant-date fair value of $598 million. Restricted stock units and performance share units that vested during the six months ended June 30, 2025 had an aggregate fair value at vesting of $1.1 billion. At June 30, 2025, there was $967 million of estimated total future stock-based compensation expense related to unvested restricted stock units and performance share units to be recognized over a weighted-average period of 2.1 years.
The following table summarizes the activity in restricted stock units and performance share units during the six months ended June 30, 2025: 
Restricted Stock UnitsPerformance Share Units
SharesWeighted-average Grant-date Fair ValueSharesWeighted-average Grant-date Fair Value
Unvested at December 31, 2024
278,723$2,994200,154$2,779
Granted
100,340$4,95020,113$5,054
Vested(138,714)$2,789(85,764)$2,533
Performance shares adjustment (1)
4,810$4,051
Forfeited(9,248)$3,599(4,010)$2,918
Unvested at June 30, 2025231,101$3,942135,303$3,314
(1)    Probable outcome for performance-based awards is updated based upon changes in actual and forecasted operating results and the impact of modifications, if any.