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EMPLOYEE BENEFIT PLANS
 9 Months Ended
Sep. 30, 2025
Share-Based Payment Arrangement [Abstract]  
EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS
The accompanying Condensed Consolidated Statements of Operations for the nine months ended September 30, 2025 and 2024 include $79 million and $52 million, respectively, of pre-tax compensation costs related to our stock‑based compensation arrangements.
Stock Options
As of September 30, 2025, there were 163,881 stock options outstanding under our share-based compensation plans, which had a weighted average exercise price per share of $24.19. During the nine months ended September 30, 2025 and 2024, 22,616 and 185,943 stock options, respectively, were exercised with an aggregate intrinsic value of $4 million and $17 million, respectively. Other than the exercise of these options, there was no activity related to our stock options during either of the nine-month periods ended September 30, 2025 or 2024. All outstanding options were vested and exercisable at September 30, 2025, and the options collectively had an aggregate intrinsic value of $29 million.
Restricted Stock Units
The following table presents information about our restricted stock unit (“RSU”) activity during the nine months ended September 30, 2025:
Number of RSUs
Weighted Average
Grant Date Fair 
Value Per RSU
Unvested at December 31, 20241,481,999 $83.84 
Granted596,923 $138.06 
Performance-based adjustment255,386 $80.85 
Vested(854,205)$80.61 
Forfeited(13,571)$95.83 
Unvested at September 30, 20251,466,532 $111.16 
During the nine months ended September 30, 2025, we granted 317,154 RSUs that will vest over periods ranging from one to four years. In addition, we granted 279,769 performance-based RSUs, the vesting of which is contingent on our achievement of specified performance goals for the years 2025 to 2028. Provided the goals are achieved, the performance‑based RSUs that could vest will range from 0% to 250% of the 279,769 units granted, depending on our level of achievement with respect to the performance goals. During the same period, we issued an additional 255,386 RSUs that vested immediately as a result of our level of achievement with respect to previously awarded performance-based RSUs.
During the nine months ended September 30, 2024, we granted 274,716 RSUs that vest over periods ranging from one to three years. In addition, we granted 297,339 performance-based RSUs, the vesting of which is contingent on our achievement of specified performance goals for the years 2024 to 2026. Provided the goals are achieved, the performance‑based RSUs that could vest will range from 0% to 250% of the 297,339 units granted, depending on our level of achievement with respect to the performance goals. During the same period, we issued an additional 205,075 RSUs that vested immediately as a result of our level of achievement with respect to previously awarded performance-based RSUs.
The fair value of an RSU is based on our share price on the grant date. The fair value of an RSU with a market‑based condition is estimated through the use of a Monte Carlo simulation. Significant inputs used in our valuation of these RSUs included the following:
Nine Months Ended September 30,
20252024
Expected volatility
36.6% - 48.0%
34.9% - 52.1%
Risk-free interest rate
4.1% - 4.3%
4.4% - 4.9%