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Lines of credit and loan facilities (Details)
¥ in Thousands
Sep. 30, 2019
CNY (¥)
Lines of credit and loan facilities  
Amount reserved for the issuance of bank acceptance ¥ 23,144,408
Amount reserved for bank guarantee 1,096,040
Unsecured revolving lines of credit  
Lines of credit and loan facilities  
Revolving lines of credit ¥ 65,411,062