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Note 4 - Stock Options and Other Stock Plans - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Outstanding, Options (in shares) 2,569  
Outstanding, weighted average exercise price (in dollars per share) $ 132.49  
Outstanding, Weighted-Average Remaining Contractual Term (Year) 6 years 3 months 18 days 6 years 4 months 24 days
Outstanding, Aggregate Intrinsic Value $ 215 $ 195
Granted, Options (in shares) 387  
Granted, weighted average exercise price (in dollars per share) $ 204.45  
Exercised, Options (in shares) (753)  
Exercised, weighted average exercise price (in dollars per share) $ 118.11  
Forfeited or expired, Options (in shares) (97)  
Forfeited or expired, weighted average exercise price (in dollars per share) $ 154.62  
Outstanding, Options (in shares) 2,106 2,569
Outstanding, weighted average exercise price (in dollars per share) $ 149.84 $ 132.49
Vested or expected to vest, Options (in shares) 2,083  
Vested or expected to vest, weighted average exercise price (in dollars per share) $ 149.37  
Vested or expected to vest, Weighted-Average Remaining Contractual Term (Year) 6 years 3 months 18 days  
Vested or expected to vest, Aggregate Intrinsic Value $ 214  
Exercisable, Options (in shares) 1,334  
Options, exercisable, Weighted-Average Exercise Price (in dollars per share) $ 126.38  
Options, Exercisable, Weighted-Average Remaining Contractual Term (Year) 5 years 2 months 12 days  
Options, Exercisable, Aggregate Intrinsic Value $ 167