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Note 4 - Stock-based Compensation - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Outstanding, Options (in shares) 2,072  
Outstanding, weighted average exercise price (in dollars per share) $ 180.56  
Outstanding, Weighted-Average Remaining Contractual Term (Year) 6 years 1 month 6 days 5 years 10 months 24 days
Outstanding, Aggregate Intrinsic Value $ 87 $ 135
Granted, Options (in shares) 305  
Granted, weighted average exercise price (in dollars per share) $ 248.82  
Exercised, Options (in shares) (152)  
Exercised, weighted average exercise price (in dollars per share) $ 139.36  
Forfeited or expired, Options (in shares) (19)  
Forfeited or expired, weighted average exercise price (in dollars per share) $ 228.8  
Outstanding, Options (in shares) 2,206 2,072
Outstanding, weighted average exercise price (in dollars per share) $ 192.42 $ 180.56
Vested or expected to vest, Options (in shares) 2,188  
Vested or expected to vest, weighted average exercise price (in dollars per share) $ 192.1  
Vested or expected to vest, Weighted-Average Remaining Contractual Term (Year) 6 years 1 month 6 days  
Vested or expected to vest, Aggregate Intrinsic Value $ 87  
Exercisable, Options (in shares) 1,591  
Options, exercisable, Weighted-Average Exercise Price (in dollars per share) $ 177.29  
Options, Exercisable, Weighted-Average Remaining Contractual Term (Year) 5 years  
Options, Exercisable, Aggregate Intrinsic Value $ 82