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Inventories, net (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Inventories      
Inventory, Gross ¥ 60,924,560   ¥ 59,018,575
Inventory valuation allowance (1,992,041)   (1,086,419)
Inventories, net 58,932,519 $ 9,031,804 57,932,156
Products      
Inventories      
Inventory, Gross 60,454,174   58,795,341
Packing materials and others      
Inventories      
Inventory, Gross ¥ 470,386   ¥ 223,234