Share-based Payments - Summary of Black-Scholes Option-Pricing Models (Details) - $ / shares	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Share Based Payments [Line Items]
Weighted-average share price (US$)	$ 162.82	$ 136.09	$ 142.20
Bottom of Range
Disclosure Of Share Based Payments [Line Items]
Expected volatility (%)	30.00%	30.10%	32.00%
Risk-free interest rate (%)	0.10%	1.40%	2.40%
Expected life of stock options (years)	2 years 7 months 6 days	2 years 6 months	2 years 4 months 24 days
Top of Range
Disclosure Of Share Based Payments [Line Items]
Expected volatility (%)	42.80%	35.20%	34.70%
Risk-free interest rate (%)	1.70%	2.60%	2.90%
Expected life of stock options (years)	4 years 9 months 18 days	4 years 9 months 18 days	4 years 4 months 24 days

Description of expected life share options granted.

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- Definition

Disclosure of share based payments.

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No definition available.

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- Definition

The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2020-01-01
-Paragraph 47
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-URIDate 2020-01-01

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The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]]

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- Definition

The weighted average share price used as input to the option pricing model to calculate the fair value of share options granted. [Refer: Option pricing model [member]; Weighted average [member]]

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