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Inventories, net (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2015
USD ($)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Inventories      
Inventories, net $ 3,170,759 ¥ 20,539,543 ¥ 12,190,843
Products      
Inventories      
Inventories, net   20,436,275 12,119,359
Packing materials and others      
Inventories      
Inventories, net   ¥ 103,268 ¥ 71,484