Note 4 - Stock-based Compensation - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	9 Months Ended	12 Months Ended
	Sep. 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	5 years 10 months 24 days
Outstanding, Aggregate Intrinsic Value	$ 106	$ 135
Granted, Options (in shares)	305
Granted, weighted average exercise price (in dollars per share)	$ 248.82
Exercised, Options (in shares)	(306)
Exercised, weighted average exercise price (in dollars per share)	$ 147.67
Forfeited or expired, Options (in shares)	(45)
Forfeited or expired, weighted average exercise price (in dollars per share)	$ 230.75
Outstanding, Options (in shares)	2,026	2,072
Outstanding, weighted average exercise price (in dollars per share)	$ 194.69	$ 180.56
Vested or expected to vest, Options (in shares)	2,008
Vested or expected to vest, weighted average exercise price (in dollars per share)	$ 194.38
Vested or expected to vest, Weighted-Average Remaining Contractual Term (Year)	6 years
Vested or expected to vest, Aggregate Intrinsic Value	$ 105
Exercisable, Options (in shares)	1,434
Options, exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 179.46
Options, Exercisable, Weighted-Average Remaining Contractual Term (Year)	4 years 10 months 24 days
Options, Exercisable, Aggregate Intrinsic Value	$ 96