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Equity Incentive Plans
 3 Months Ended
Mar. 31, 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 March 31, 2024, we had unrecognized stock-based compensation expense of $613 million under these grants to purchase or receive an aggregate 5.0 million shares of our common stock. For awards probable of achievement, we estimate the unrecognized stock-based compensation expense of $104 million will be recognized over a weighted-average period of 4.8 years.
For the three months ended March 31, 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 March 31,
20242023
Cost of revenues$202 $192 
Research and development212 134 
Selling, general and administrative110 92 
Total$524 $418