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Restricted net assets (Details)
¥ in Thousands
12 Months Ended
Dec. 31, 2019
CNY (¥)
Restricted net assets  
Restricted net assets ¥ 24,189,454
PRC  
Restricted net assets  
Required minimum percentage of annual appropriations to general reserve fund or statutory surplus fund 10.00%
PRC | General reserve fund | Foreign invested enterprise  
Restricted net assets  
Required minimum percentage of annual appropriations to general reserve fund 10.00%
Maximum percentage of statutory general reserve related to entity's registered capital 50.00%
PRC | Statutory surplus reserve | Domestic enterprise  
Restricted net assets  
Required minimum percentage of annual appropriations to statutory surplus fund 10.00%
Maximum percentage of statutory surplus reserve related to entity's registered capital 50.00%