Stock-based compensation - Summary of Stock Options (Details) - Stock options $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) $ / shares shares
Options
Balance unexercised at beginning of period (in shares) | shares	5.3
Granted (in shares) | shares	1.1
Exercised (in shares) | shares	(0.4)
Expired/forfeited (in shares) | shares	(0.1)
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	2.8
Weighted- average exercise price
Balance unexercised at beginning of period (in usd per share) | $ / shares	$ 207.29
Granted (in usd per share) | $ / shares	235.97
Exercised (in usd per share) | $ / shares	182.33
Expired/forfeited (in usd per share) | $ / shares	234.10
Balance unexercised at end of period (in shares) | $ / shares	213.90
Weighted-average exercise price, vested or expected to vest (in usd per share) | $ / shares	213.15
Weighted-average exercise price, exercisable (in usd per share) | $ / shares	$ 190.59
Stock options information [Abstract]
Weighted-average remaining contractual life (years), unexercised	6 years 8 months 12 days
Weighted-average remaining contractual life (years), vested or expected to vest	6 years 8 months 12 days
Weighted-average remaining contractual life (years), exercisable	5 years
Aggregate intrinsic value, unexercised | $	$ 438
Aggregate intrinsic value, vested or expected to vest | $	427
Aggregate intrinsic value, exercisable | $	$ 271