Stock-based compensation - Schedule of Stock Options (Details) - Stock options $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) $ / shares shares
Options
Balance unexercised at beginning of period (in shares) | shares	5.9
Granted (in shares) | shares	0.8
Exercised (in shares) | shares	(0.6)
Expired/forfeited (in shares) | shares	(0.2)
Balance unexercised at end of period (in shares) | shares	5.9
Vested or expected to vest (in shares) | shares	5.7
Exercisable (in shares) | shares	3.1
Weighted- average exercise price
Balance unexercised at beginning of period (in usd per share) | $ / shares	$ 213.90
Granted (in usd per share) | $ / shares	300.32
Exercised (in usd per share) | $ / shares	201.22
Expired/forfeited (in usd per share) | $ / shares	248.94
Balance unexercised at end of period (in shares) | $ / shares	225.84
Weighted-average exercise price, vested or expected to vest (in usd per share) | $ / shares	224.34
Weighted-average exercise price, exercisable (in usd per share) | $ / shares	$ 202.02
Stock options information [Abstract]
Weighted-average remaining contractual life (in years), unexercised	6 years 3 months 18 days
Weighted-average remaining contractual life (in years), vested or expected to vest	6 years 2 months 12 days
Weighted-average remaining contractual life (in years), exercisable	4 years 7 months 6 days
Aggregate intrinsic value, unexercised | $	$ 236
Aggregate intrinsic value, vested or expected to vest | $	234
Aggregate intrinsic value, exercisable | $	$ 182