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Summary of significant accounting policies (Details 3)
¥ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2022
CNY (¥)
segment
item
lease
Dec. 31, 2022
USD ($)
segment
item
lease
Dec. 31, 2021
CNY (¥)
item
segment
lease
Dec. 31, 2020
CNY (¥)
item
lease
segment
Dec. 31, 2022
USD ($)
Revenue          
Liabilities for return allowances ¥ 743   ¥ 618    
Net revenues 1,046,236 $ 151,690 951,592 ¥ 745,802  
Accounts receivable, net of allowance for doubtful accounts 20,576   11,900   $ 2,983
Unearned revenue 33,325   ¥ 29,184    
Unearned revenue recognized ¥ 22,103        
Revenue, Practical Expedient true true      
Customer incentives and loyalty programs          
Types of discounted coupons | item 2 2 2 2  
Fulfillment          
Fulfillment ¥ 63,011 $ 9,136 ¥ 59,055 ¥ 48,700  
Marketing          
Advertising costs ¥ 29,898   ¥ 32,704 ¥ 23,088  
Leases          
Number of finance leases | lease 0 0 0 0  
Segment reporting          
Number of major business segments | segment 4 4 3 2  
Statutory reserves          
Appropriations of statutory reserves ¥ 1,887   ¥ 53 ¥ 74  
Appropriations to other reserve funds ¥ 0   0 0  
PRC | General reserve fund | Foreign invested enterprise          
Statutory reserves          
Minimum portion of after tax profit to be allocated to general reserve under PRC law (as a percentage) 10.00% 10.00%      
Maximum percentage of statutory general reserve related to entity's registered capital 50.00% 50.00%      
PRC | Statutory surplus reserve | Domestic enterprise          
Statutory reserves          
Minimum portion of after tax profit to be allocated to statutory surplus under PRC law (as a percentage) 10.00% 10.00%      
Maximum percentage of statutory surplus reserve related to entity's registered capital 50.00% 50.00%      
Electronics and home appliance products          
Revenue          
Net revenues ¥ 515,945   492,592 400,927  
General merchandise products          
Revenue          
Net revenues 349,117   323,063 250,952  
Shipping          
Fulfillment          
Fulfillment 28,958   27,786 23,088  
Online marketplace and marketing services          
Revenue          
Net revenues 81,970   72,118 53,473  
Logistics and other services          
Revenue          
Net revenues 99,204   63,819 ¥ 40,450  
Accrued expenses and other current liabilities          
Revenue          
Liabilities for return allowances 743   618    
Prepayments and other current assets          
Revenue          
Rights to recover products from customers ¥ 785   ¥ 660