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Subsequent events (Details) - Subsequent event
¥ in Thousands, $ in Thousands
1 Months Ended
Apr. 30, 2016
USD ($)
Jan. 31, 2016
CNY (¥)
Dada Nexus Limited ("Dada")    
Subsequent events    
Payment to acquire equity interest of the merged business | $ $ 200,000  
Percentage of equity interest acquired 47.00%  
JD Finance | Lead investors including Sequoia Capital China, China Harvest Investments and China Taiping Insurance    
Subsequent events    
Amount of financing round announced | ¥   ¥ 6,650,000
Ownership percentage, on a fully-diluted, post-investment basis (as a percentage)   14.00%