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Lines of credit and loan facilities (Details)
¥ in Thousands
Dec. 31, 2018
CNY (¥)
Lines of credit and loan facilities  
Amount used for liquidity loans ¥ 10,000
Amount reserved for the issuance of bank acceptance 17,742,759
Amount reserved for bank guarantee 1,229,346
Amount used for other facilities 5,331
Unsecured revolving lines of credit  
Lines of credit and loan facilities  
Revolving lines of credit ¥ 60,850,936