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Inventories, net (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Inventories        
Inventory, Gross   ¥ 59,018,575 ¥ 44,898,944 ¥ 42,199,152
Inventory valuation allowance   (1,086,419) (868,860) (498,773)
Inventories, net $ 8,321,434 57,932,156 44,030,084 41,700,379
Products        
Inventories        
Inventory, Gross   58,795,341 44,678,983 41,840,945
Packing materials and others        
Inventories        
Inventory, Gross   ¥ 223,234 ¥ 219,961 ¥ 358,207