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Equity Incentive Plans
 9 Months Ended
Sep. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Equity Incentive Plans Equity Incentive Plans
Other 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 September 30, 2024, we had unrecognized stock-based compensation expense of $487 million under these grants to purchase or receive an aggregate 4.9 million shares of our common stock. For awards probable of achievement, we estimate the unrecognized stock-based compensation expense of $457 million will be recognized over a weighted-average period of 4.3 years.
For the three and nine months ended September 30, 2024 and 2023, 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 September 30,Nine Months Ended September 30,
2024202320242023
Cost of revenues$184 $181 $566 $554 
Research and development191 189 572 491 
Selling, general and administrative82 95 280 283 
Restructuring and other— — 2 — 
Total$457 $465 $1,420 $1,328