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Note 4 - Stock-based Compensation - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Outstanding, Options (in shares) 2,106  
Outstanding, weighted average exercise price (in dollars per share) $ 149.84  
Outstanding, Weighted-Average Remaining Contractual Term (Year) 6 years 6 years 3 months 18 days
Outstanding, Aggregate Intrinsic Value $ 86 $ 215
Granted, Options (in shares) 328  
Granted, weighted average exercise price (in dollars per share) $ 244.35  
Exercised, Options (in shares) (421)  
Exercised, weighted average exercise price (in dollars per share) $ 124.60  
Forfeited or expired, Options (in shares) (39)  
Forfeited or expired, weighted average exercise price (in dollars per share) $ 214.72  
Outstanding, Options (in shares) 1,974 2,106
Outstanding, weighted average exercise price (in dollars per share) $ 169.64 $ 149.84
Vested or expected to vest, Options (in shares) 1,954  
Vested or expected to vest, weighted average exercise price (in dollars per share) $ 169.12  
Vested or expected to vest, Weighted-Average Remaining Contractual Term (Year) 6 years  
Vested or expected to vest, Aggregate Intrinsic Value $ 85  
Exercisable, Options (in shares) 1,308  
Options, exercisable, Weighted-Average Exercise Price (in dollars per share) $ 144.09  
Options, Exercisable, Weighted-Average Remaining Contractual Term (Year) 4 years 10 months 24 days  
Options, Exercisable, Aggregate Intrinsic Value $ 82