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Summary of significant accounting policies (Details)
¥ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
Foreign currency translation        
Total exchange gains/(losses) ¥ 114 $ 17 ¥ 42 ¥ (90)
Total foreign currency translation adjustments gains/(losses) ¥ 7,810 $ 1,132 (2,872) (7,955)
Convenience translation        
Convenience translation rate (RMB to USD) 6.8972      
Loan receivables, net        
Provision for the doubtful loan receivables ¥ 0   0 ¥ 0
Construction in progress        
Amount of construction in progress ¥ 11,161   5,817  
Minimum        
Loan receivables, net        
Loan periods extended range 1 month 1 month    
Maximum        
Loan receivables, net        
Loan periods extended range 24 months 24 months    
Electronic equipment | Minimum        
Property, equipment and software, net        
Estimated useful Lives (in Years) 3 years 3 years    
Electronic equipment | Maximum        
Property, equipment and software, net        
Estimated useful Lives (in Years) 5 years 5 years    
Office equipment        
Property, equipment and software, net        
Estimated useful Lives (in Years) 5 years 5 years    
Vehicles | Minimum        
Property, equipment and software, net        
Estimated useful Lives (in Years) 3 years 3 years    
Vehicles | Maximum        
Property, equipment and software, net        
Estimated useful Lives (in Years) 6 years 6 years    
Logistic,warehouse and other heavy equipment | Minimum        
Property, equipment and software, net        
Estimated useful Lives (in Years) 5 years 5 years    
Logistic,warehouse and other heavy equipment | Maximum        
Property, equipment and software, net        
Estimated useful Lives (in Years) 10 years 10 years    
Leasehold improvement        
Property, equipment and software, net        
Estimated useful Lives Over the shorter of the expected life of leasehold improvements or the lease term Over the shorter of the expected life of leasehold improvements or the lease term    
Software | Minimum        
Property, equipment and software, net        
Estimated useful Lives (in Years) 3 years 3 years    
Software | Maximum        
Property, equipment and software, net        
Estimated useful Lives (in Years) 5 years 5 years    
Land        
Property, equipment and software, net        
Estimated useful Lives Indefinite Indefinite    
Building        
Property, equipment and software, net        
Estimated useful Lives (in Years) 40 years 40 years    
Building improvement | Minimum        
Property, equipment and software, net        
Estimated useful Lives (in Years) 5 years 5 years    
Building improvement | Maximum        
Property, equipment and software, net        
Estimated useful Lives (in Years) 10 years 10 years    
Other non-current assets        
Loan receivables, net        
The loan receivables with the collection period over one year ¥ 142   733  
Prepayments and other current assets        
Loan receivables, net        
The loan receivables with the collection period less than one year ¥ 2,131   ¥ 1,817