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Convertible redeemable non-controlling interests (Details) - 12 months ended Dec. 31, 2018
$ / shares in Units, ¥ in Thousands, $ in Thousands
USD ($)
Vote
$ / shares
shares
CNY (¥)
Vote
Temporary Equity    
Number of vote per share | Vote 1 1
Number of ordinary shares issued on conversion of each preferred shares | shares 1  
Series A Preferred Shares    
Temporary Equity    
Issuance of preferred shares | ¥   ¥ 15,973,564
Term of preferred shares redeemable by holders 5 years 5 years
Minimum offering value on fully diluted basis $ 20,000,000  
Shares purchase price | $ / shares $ 2.50  
Jingdong Express    
Temporary Equity    
Ownership percentage, on a fully-diluted (as a percentage) 19.00%  
Jingdong Express | Series A Preferred Shares    
Temporary Equity    
Issuance of preferred shares $ 2,510,000