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Loan facilities and lines of credit (Details 4)
¥ in Millions
Dec. 31, 2023
CNY (¥)
Lines of credit and loan facilities  
Line of credit reserved for issuances of bank acceptance and bank guarantee ¥ 120,695
Line of Credit [Member]  
Lines of credit and loan facilities  
Short-term Debt, Weighted Average Interest Rate, at Point in Time 3.10%
Unsecured revolving lines of credit  
Lines of credit and loan facilities  
Revolving lines of credit ¥ 164,333