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STOCK-BASED COMPENSATION (Tables)
 6 Months Ended
Jun. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Schedule of Share-based Payment Arrangement, Activity The following table summarizes the Company’s restricted stock unit activity during the six months ended June 30, 2024:
RSUs
Number of Shares
 (in millions)		Weighted-Average Grant-Date Fair Value
Outstanding at December 31, 202356 $22.36 
Granted67 $10.23 
Exercised / Vested(36)$16.35 
Forfeited / Cancelled(8)$20.95 
Outstanding at June 30, 202479 $15.03 
Vested and expected to vest at June 30, 202479 $15.03 
Schedule of Share-based Payment Arrangement, Expensed and Capitalized, Amount
The following table summarizes the Company’s stock-based compensation expense for the Stock Plans and 2021 Employee Stock Purchase Plan (“ESPP”) by line item in the Condensed Consolidated Statements of Operations (in millions):

Three Months Ended June 30,Six Months Ended June 30,
2023202420232024
Cost of revenues$23 $17 $41 $40 
Research and development72 98 156 222 
Selling, general, and administrative86 79 167 165 
Total stock-based compensation expense$181 $194 $364 $427