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Lines of credit and loan facilities (Details)
¥ in Thousands
Dec. 31, 2019
CNY (¥)
Lines of credit and loan facilities  
Amount reserved for the issuance of bank acceptance ¥ 23,297,902
Amount reserved for bank guarantee 995,014
Unsecured revolving lines of credit  
Lines of credit and loan facilities  
Revolving lines of credit ¥ 75,337,037