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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2024
Equity [Abstract]  
Summary of Stock Options and SAR Activity
A summary of stock option and SAR activity for the six months ended June 30, 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— 227 $81.03 
Exercised(71)(5,206)$17.77 
Canceled and forfeited— (520)$33.08 
As of June 30, 202452 7,142 $22.47 3.09$363 
Vested and expected to vest as of June 30, 202452 6,067 $19.00 2.60$328 
Exercisable as of June 30, 202452 6,067 $19.00 2.60$328 
Schedule of Restricted Stock Units Activity
The following table summarizes the activity related to our RSUs for the six months ended June 30, 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 
Granted24,198 $75.55 
Vested(23,702)$37.08 
Canceled and forfeited(5,864)$37.97 
Unvested and outstanding as of June 30, 202485,459 $45.34 
Schedule of Stock-Based Compensation Expense by Function The following table summarizes total stock-based compensation expense by function (in millions):
Three Months Ended June 30,Six Months Ended June 30,
2023202420232024
Operations and support$45 $54 $83 $121 
Sales and marketing26 24 50 45 
Research and development317 277 607 576 
General and administrative116 100 234 197 
Total$504 $455 $974 $939