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Lines of credit and loan facilities (Details)
Dec. 31, 2020
CNY (¥)
Lines of credit and loan facilities  
Amount reserved for the issuance of bank acceptance ¥ 22,206,272,000
Amount reserved for bank guarantee 1,076,566,000
Unsecured revolving lines of credit  
Lines of credit and loan facilities  
Revolving lines of credit ¥ 100,087,349,000