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Equity Incentive Plans
 6 Months Ended
Jun. 30, 2025
Share-Based Payment Arrangement [Abstract]  
Equity Incentive Plans Equity Incentive Plans
Performance-Based Grants
From time to time, the Compensation Committee of our Board of Directors grants certain employees performance-based restricted stock units and stock options.
As of June 30, 2025, we had unrecognized stock-based compensation expense of $709 million under these grants to purchase or receive an aggregate 7.2 million shares of our common stock. For awards probable of achievement, we estimate the unrecognized stock-based compensation expense of $637 million will be recognized over a weighted-average period of 3.6 years.
For the three and six months ended June 30, 2025, we recorded $54 million and $92 million, respectively, of stock-based compensation expense related to these grants, net of forfeitures. For the three and six months ended June 30, 2024, stock-based compensation expense related to these grants, net of forfeitures, were immaterial.
Summary Stock-Based Compensation Information
The following table summarizes our stock-based compensation expense by line item in the consolidated statements of operations (in millions):
Three Months Ended June 30,Six Months Ended June 30,
2025202420252024
Cost of revenues$213 $180 $422 $382 
Research and development298 169 575 381 
Selling, general and administrative124 88 211 198 
Restructuring and other— 2 — 2 
Total$635 $439 $1,208 $963