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Inventories, net (Details)
¥ in Millions, $ in Millions
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Inventories      
Inventory, Gross ¥ 77,900   ¥ 60,925
Inventory valuation allowance (2,299)   (1,992)
Inventories, net 75,601 $ 11,863 58,933
Products      
Inventories      
Inventory, Gross 77,422   60,455
Packing materials and others      
Inventories      
Inventory, Gross ¥ 478   ¥ 470