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Inventories, net (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Inventories      
Inventory, Gross   ¥ 42,199,152 ¥ 29,322,679
Inventory valuation allowance   (498,773) (413,254)
Inventories, net $ 6,409,231 41,700,379 28,909,425
Products      
Inventories      
Inventory, Gross   41,840,945 29,191,782
Packing materials and others      
Inventories      
Inventory, Gross   ¥ 358,207 ¥ 130,897