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Inventories, net (Details)
¥ in Thousands, $ in Thousands
Sep. 30, 2019
CNY (¥)
Sep. 30, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Inventories      
Inventory, Gross ¥ 49,360,503   ¥ 44,898,944
Inventory valuation allowance (1,095,054)   (868,860)
Inventories, net 48,265,449 $ 6,752,585 44,030,084
Products      
Inventories      
Inventory, Gross 49,182,983   44,678,983
Packing materials and others      
Inventories      
Inventory, Gross ¥ 177,520   ¥ 219,961