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Lines of credit and loan facilities (Details)
¥ in Millions
Dec. 31, 2021
CNY (¥)
Lines of credit and loan facilities  
Amount reserved for the issuance of bank acceptance ¥ 28,749
Amount reserved for bank guarantee 2,146
Unsecured revolving lines of credit  
Lines of credit and loan facilities  
Revolving lines of credit ¥ 115,281