Taxation - Withholding income tax on dividends (Details)	12 Months Ended
Dec. 31, 2020
Withholding income tax
Withholding tax rate on dividend distributed by foreign investment entities (as a percent)	10.00%
Withholding tax rate on dividends paid by a FIE to its immediate holding company in Hong Kong (as a percent)	5.00%
Minimum percentage of ownership interests held by foreign investors for lower withholding tax rate (as a percent)	25.00%

Represents the lower withholding income tax rate on dividends that is applied if the holding company receiving the dividend is located in a country that has a tax treaty with the country in which the foreign investment entity (FIE) is located, if the foreign investor owns directly at least 25% of the shares of the FIE.

No definition available.

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Period Type:	duration