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STOCK-BASED COMPENSATION
3 Months Ended
Mar. 31, 2024
Share-Based Payment Arrangement [Abstract]  
STOCK-BASED COMPENSATION STOCK-BASED COMPENSATION
We granted 0.8 million restricted stock units (“RSUs”) during the 2024 first quarter to certain officers and employees, and those units vest generally over four years in equal annual installments commencing one year after the grant date. We also granted 0.1 million performance-based RSUs (“PSUs”) in the 2024 first quarter to certain executives, which are earned subject to continued employment and the satisfaction of certain performance and market conditions based on the degree of achievement of pre-established targets for 2026 adjusted EBITDA performance and relative total stockholder return over the 2024 to 2026 performance period. RSUs, including PSUs, granted in the 2024 first quarter had a weighted average grant-date fair value of $226 per unit.
We recorded stock-based compensation expense for RSUs and PSUs of $45 million in the 2024 first quarter and $33 million in the 2023 first quarter. Deferred compensation costs for unvested awards for RSUs and PSUs totaled $322 million at March 31, 2024 and $171 million at December 31, 2023.