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Equity Incentive Plans
 9 Months Ended
Sep. 30, 2023
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 (“RSUs”) and stock options.
As of September 30, 2023, we had unrecognized stock-based compensation expense of $525 million under these grants to purchase or receive an aggregate 4.7 million shares of our common stock. For awards probable of achievement, we estimate the unrecognized stock-based compensation expense of $131 million will be recognized over a weighted-average period of 3 years.
For the three and nine months ended September 30, 2023, we recorded $10 million and $56 million, respectively, of stock-based compensation expense related to these grants, net of forfeitures. For the three and nine months ended September 30, 2022, we recorded $31 million and $134 million, respectively, of stock-based compensation expense related to these grants, net of forfeitures.
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,
2023202220232022
Cost of revenues$181 $150 $554 $424 
Research and development189 124 491 389 
Selling, general and administrative95 88 283 328 
Total$465 $362 $1,328 $1,141 
Our income tax benefits recognized from stock-based compensation arrangements in each of the periods presented were immaterial due to cumulative losses and valuation allowances.