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Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2024
Equity [Abstract]  
Summary of Stock Options and SAR Activity
A summary of stock option and SAR activity for the year ended December 31, 2024 is as follows (in millions, except share amounts which are reflected in thousands, per share amounts, and years):
SARs Outstanding Number of SARsOptions Outstanding Number of SharesWeighted-Average Exercise Price Per ShareWeighted-Average Remaining Contractual Life (in years)Aggregate Intrinsic Value
As of December 31, 2023123 12,641 $20.03 2.79$535 
Granted— 3,009 $62.72 
Exercised(90)(7,909)$16.90 
Canceled and forfeited— (543)$32.19 
As of December 31, 202433 7,198 $40.16 4.90$153 
Exercisable as of December 31, 202433 3,484 $22.03 3.16$135 
Schedule of Restricted Stock Units Activity
The following table summarizes the activity related to our RSUs for the year ended December 31, 2024 (in thousands, except per share amounts):
Number of SharesWeighted-Average
 Grant-Date Fair
 Value per Share
Unvested and outstanding as of December 31, 202390,827 $34.49 
Granted28,750 $74.87 
Vested(43,285)$38.76 
Canceled and forfeited(10,090)$40.89 
Unvested and outstanding as of December 31, 202466,202 $48.49 
Schedule of Stock-Based Compensation Expense by Function The following table summarizes total stock-based compensation expense by function for the years ended December 31, 2022, 2023 and 2024 (in millions):
Year Ended December 31,
202220232024
Operations and support$154 $184 $218 
Sales and marketing102 96 91 
Research and development1,060 1,215 1,104 
General and administrative477 440 383 
Total$1,793 $1,935 $1,796