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Inventories, net (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2016
USD ($)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Inventories      
Inventories, net $ 4,163,825 ¥ 28,909,438 ¥ 20,539,543
Products      
Inventories      
Inventories, net   28,778,528 20,436,275
Packing materials and others      
Inventories      
Inventories, net   ¥ 130,910 ¥ 103,268