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Summary of significant accounting policies (Details 3)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
item
lease
segment
Dec. 31, 2020
CNY (¥)
item
lease
segment
Dec. 31, 2019
CNY (¥)
lease
Dec. 31, 2018
CNY (¥)
lease
Dec. 31, 2020
CNY (¥)
Revenue          
Liabilities for return allowances     ¥ 425,135,000   ¥ 496,005,000
Net revenues $ 114,299,140 ¥ 745,801,886,000 576,888,484,000 ¥ 462,019,759,000  
Accounts receivable, net of allowance for doubtful accounts $ 1,089,954   6,190,588,000   7,111,947,000
Unearned revenue     21,347,848,000   26,033,158,000
Unearned revenue recognized   ¥ 16,442,795,000      
Revenue, Practical Expedient true true      
Customer incentives and loyalty programs          
Types of discounted coupons | item 2 2      
Fulfillment          
Fulfillment $ 7,463,634 ¥ 48,700,211,000 36,968,041,000 32,009,658,000  
Marketing          
Advertising costs   ¥ 23,087,563,000 ¥ 19,285,939,000 ¥ 15,970,433,000  
Leases          
Number of capital leases | lease 0 0 0 0  
Segment reporting          
Number of major business segments | segment 2 2      
Statutory reserves          
Appropriations of statutory reserves   ¥ 74,111,000 ¥ 58,753,000 ¥ 764,446,000  
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   ¥ 400,927,285,000 328,703,453,000 280,059,089,000  
General merchandise products          
Revenue          
Net revenues   250,951,955,000 182,030,514,000 136,049,657,000  
Shipping          
Fulfillment          
Fulfillment   23,088,408,000 17,858,972,000 15,216,351,000  
Online marketplace and marketing services          
Revenue          
Net revenues   53,472,718,000 42,680,212,000 33,531,862,000  
Logistics and other services          
Revenue          
Net revenues   ¥ 40,449,928,000 23,474,305,000 ¥ 12,379,151,000  
Accrued expenses and other current liabilities          
Revenue          
Liabilities for return allowances     425,135,000   496,005,000
Prepayments and other current assets          
Revenue          
Rights to recover products from customers     ¥ 454,298,000   ¥ 533,264,000