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Loan facilities and lines of credit (Details 2)
¥ in Millions, $ in Millions
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CNY (¥)
Debt Instrument [Line Items]      
Unsecured senior notes ¥ 10,411 $ 1,466 ¥ 10,224
Total Loan Facilities 47,000    
Unsecured Senior Notes [Member]      
Debt Instrument [Line Items]      
Unsecured senior notes 10,411    
Unsecured Borrowings [Member]      
Debt Instrument [Line Items]      
Unsecured borrowings 25,202    
Secured Borrowings [Member]      
Debt Instrument [Line Items]      
Secured borrowings ¥ 11,387