Long-Term Incentive Plans - Summary of transactions involving stock option awards (Details) - Stock options - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Number of Shares (In millions)
Outstanding at beginning of period (in shares)	21,700,000
Granted (in shares)	2,300,000	2,900,000	3,300,000
Forfeited (in shares)	(400,000)
Exercised (in shares)	(5,600,000)
Outstanding at end of period (in shares)	18,000,000.0	21,700,000
Vested and expected to vest (in shares)	17,200,000
Exercisable (in shares)	11,300,000
Weighted-Average Exercise Price
Outstanding at beginning of period (in dollars per share)	$ 379.51
Granted (in dollars per share)	628.43	$ 492.60	$ 366.65
Forfeited (in dollars per share)	419.51
Exercised (in dollars per share)	299.23
Outstanding at end of period (in dollars per share)	435.56	$ 379.51
Vested and expected to vest (in dollars per share)	431.33
Exercisable (in dollars per share)	$ 398.83
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted average remaining contractual term (in years) - outstanding	6 years 6 months
Weighted average remaining contractual term - vested and expected to vest	6 years 3 months 18 days
Weighted average remaining contractual term - exercisable	5 years 2 months 12 days
Intrinsic value - outstanding	$ 3,654.5
Intrinsic value - vested and expected to vest	3,566.6
Intrinsic value - exercisable	$ 2,697.6